CN103320340A - Bdellovibrio bacteriovorus preparation, and fermentation method and applications thereof - Google Patents

Bdellovibrio bacteriovorus preparation, and fermentation method and applications thereof Download PDF

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CN103320340A
CN103320340A CN2013101021316A CN201310102131A CN103320340A CN 103320340 A CN103320340 A CN 103320340A CN 2013101021316 A CN2013101021316 A CN 2013101021316A CN 201310102131 A CN201310102131 A CN 201310102131A CN 103320340 A CN103320340 A CN 103320340A
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bdellovibrio
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CN103320340B (en
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蔡俊鹏
陈小红
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South China University of Technology SCUT
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Abstract

The invention discloses a bdellovibrio bacteriovorus preparation, and a fermentation method and applications thereof. The invention discloses a bdellovibrio bacteriovorus preparation and a fermentation method and application thereof. The fermentation method comprises the following steps of: (1) preparation of a host bacteria suspension; (2) preparation of a bdellovibrio bacteriovorus telotroch concentrated solution; and (3) preparation of the bdellovibrio bacteriovorus preparation. Host bacteria adopted in the fermentation method are Gram-positive bacteria which are beneficial or harmless to the environment, the method can keep and even improve the capability of bdellovibrio bacteriovorus for cracking certain gram-positive bacteria, and the bdellovibrio bacteriovorus preparation prepared by using the method has certain improvement on the cracking capability for pathogenic bacteria; and the prepared bdellovibrio bacteriovorus preparation can be directly used without more fermentation post treatment, and the use range of the preparation is greatly increased. The method relatively shortens the fermentation period at the same time of obtaining high-concentration bdellovibrio bacteriovorus bacterial solution so as to effectively solve the problems of over-high energy consumption and over-high productioncost caused by overlong fermentation time; and the obtained bdellovibrio bacteriovorus preparation has low cost and high activity.

Description

A kind of Bdellovibrio preparation and fermentation process and application
Patent application of the present invention is that application number is dividing an application of " 201010270772.9 ", the applying date of original application is " on August 31st, 2010 ", application number is " 201010270772.9 ", and denomination of invention is " a kind of Bdellovibrio preparation and fermentation process and application ".
Technical field
The present invention relates to fermentation technical field, be specifically related to a kind of Bdellovibrio preparation and fermentation process and application.
Background technology
The main means of control at present, elimination pathogenic bacterium are still the method for various physics and/or chemistry, comprise various antibiotic uses.The method of physics and/or chemistry all exists tangible drawback, and at first, microbiotic is abused in a large number, can cause the generation of some side effects, as the resistance of pathogenic bacteria, suppress profitable strain etc.Secondly, though the method for acid-alkali treatment can reach certain sterilization/sterilization effect, after harmful bacterium formed microbial film, the effect of these methods was just extremely undesirable.At last, the method for physics can only be applied to a certain link of association area to the elimination effect of various pathogenic bacterium, and is difficult to expand to all links in whole field.The method of biological control then can have powerful superiority, very likely makes the processing of large-scale water in its disease control of serving daily life and biological warfare and the attack of terrorism, food source contact scar etc.
The research and development of microbial ecological preparation in recent years are subjected to each side and pay close attention to, and particularly the research of Bdellovibrio is subjected to people's favor.Bdellovibrio since 1963 are found, because it is a kind of bacterial parasite, can cracking gram negative pathogenic bacterias and harmless to humans and animals such as intestinal bacteria, Salmonellas, Aeromonas hydrophila, vibrios, and receive much concern.
Bdellovibrio is applied to prevent and treat the Bdellovibrio preparation that key is acquisition concentration height, cracking ability is strong of pathogenic bacterium.For this reason, people have carried out unremitting research to the preparation method of Bdellovibrio preparation, the national inventing patent application that for example number of patent application is 93111749.6, name is called " bactericide prepared from biology and production method thereof " proposes with high temperature (70～150 ℃) or chemicals (chloroform etc.) intestinal bacteria to be killed, make the host bacterium of deactivation, then cultivate Bdellovibrio with it, obtain the Bdellovibrio preparation; Number of patent application 200810145709.5, name are called the production method that " production method of bdellovibrio bacteriovorus ecological preparation " provides bdellovibrio bacteriovorus ecological preparation, and mainly different with traditional method is host e. coli to be lyophilized into the bacterium powder use.Above-mentioned two parts of patent applications all adopt intestinal bacteria alive as the host bacterium, finally understand influence ecological environment.And the used host bacterium of the present invention is probiotics or the bacterium of environmental sound, can not threaten environment structure.The national inventing patent application that number of patent application 200810202809.7, name are called " fermentation method for producing of dual-purpose bdellovibrio " provides a kind of fermentation method for producing of dual-purpose bdellovibrio, be the suspension of first fermentative preparation host bacterium, add host strain turbid liquor again and Bdellovibrio liquid ferments in the nutrient solution for preparing.Though the Bdellovibrio content higher (5 * 10 that this production method is produced 8Pfu/mL), but its host bacterium has been selected pathogenic Aeromonas hydrophila for use, and fermentation time long (72～120h), can cause the increase of its production cost.In addition, this technology also may exist the not high problem of Bdellovibrio lytic activity of gained.Be that gram-positive microorganism is the host and the present invention adopts, experiment showed, that the Bdellovibrio that makes with this host's fermentation can keep, even improve the cracking ability to other Gram-negative bacterias and positive bacteria.
Summary of the invention
In order to overcome the existing prepared problem that the Bdellovibrio formulation content is low and lytic activity is low of method, primary and foremost purpose of the present invention is to provide a kind of fermentation process of Bdellovibrio preparation.
Another object of the present invention is to provide a kind of Bdellovibrio preparation that is prepared by above-mentioned fermentation process.
A further object of the present invention is to provide the application of above-mentioned Bdellovibrio preparation.
Purpose of the present invention is achieved through the following technical solutions: a kind of fermentation process of Bdellovibrio preparation may further comprise the steps:
(1) preparation of host bacteria suspension
The host bacterium is cultured to logarithmic phase, collects thalline, then adjust concentration with phosphate buffered saline buffer, obtaining concentration is 10 17～10 22The host bacterium suspension of cfu/mL places 2～15 ℃ of preservations standby then;
(2) preparation of Bdellovibrio telotroch concentrated solution:
The host bacterium suspension that adds step (1) preparation in phosphate buffered saline buffer, the concentration of adjusting the host bacterium is 10 10～10 15Cfu/mL, insert the Bdellovibrio spot again, then this nutrient solution is cultivated 20～60h at 20～40 ℃, again at 2～15 ℃, the centrifugal 15～35min of 5000～8000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 2～15 ℃, the centrifugal 15～40min of 12000～20000rpm keeps the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, the concentration that adds phosphate buffered saline buffer adjustment Bdellovibrio telotroch in precipitation is 10 6～10 9Pfu/mL obtains Bdellovibrio telotroch concentrated solution, places 2～15 ℃ of preservations standby;
(3) preparation of Bdellovibrio preparation:
Sodium-chlor is dissolved in the solvent to form mass volume ratio concentration be the sodium chloride solution of 0～30g/L, sterilization obtains fermention medium; Add the host bacterium suspension of step (1) preparation and the Bdellovibrio telotroch concentrated solution of step (2) preparation in fermention medium, making host bacterium initial concentration is 10 10～10 15Cfu/mL, Bdellovibrio telotroch initial concentration is 10 1～10 3Pfu/mL ferments; Leavening temperature control is at 28～30 ℃, and the pH value is controlled 7.2～7.6; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 20%～30%; Add host bacterium suspension in the fermenting process 1～3 time, add 12～18h pitch time of host bacterium suspension at every turn, the amount that at every turn adds host bacterium suspension is 10 with the concentration of initiate host bacterium in fermention medium 10～10 15Cfu/mL is as the criterion; Fermentation culture 36～48h namely makes the Bdellovibrio preparation; Described solvent is DNB liquid nutrient medium, distilled water or phosphate buffered saline buffer.
The described host bacterium of step (1) is gram-positive microorganism useful or environmental sound, is preferably subtilis (Bacillus subtilis), bacillus natto (Bacillus natto), bifidumbacterium bifidum (Bifidobacterium bifidum), enterococcus faecalis (Enterococcus faecalis), lactobacillus bulgaricus (Lactobacillus bulgaricus), pediococcus acidilactici (Pediococcus acidilactici), streptococcus acidi lactici (Streptococcus lactis), faecium (Enterococcus faecium), Bacillus licheniformis (Bacillus licheniformis), Lactobacterium acidophilum (Lactobacillus acidophilus), lactobacterium casei (Lactobacillus casei), lactobacillus lactis (Lactobacillus lactis), plant lactobacillus (Lactobacillus plantarum) or Pediococcus pentosaceus (Pediococcus pentasaceus);
The described Bdellovibrio of step (2) is BDF01, BDF02, BDF03, BDJ01, BDJ02, BDM01, BDS01, BDS02, BDSM08 or BDFM05.
Described BDF01 is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 13rd, 2008, and deposit number is CCTCC NO:M208008; Described BDF02 is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 13rd, 2008, and deposit number is CCTCC NO:M208009; Described BDF03 is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 13rd, 2008, and deposit number is CCTCC NO:M208010; Described BDJ01 is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 14th, 2008, and deposit number is CCTCC NO:M208011; Described BDJ02 is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 14th, 2008, and deposit number is CCTCC NO:M208012; Described BDM01 is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on April 28th, 2008, and deposit number is CCTCC NO:M208066; Described BDS01 is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on August 7th, 2009, and deposit number is CCTCCNO:M209169; Described BDS02 is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on August 7th, 2009, and deposit number is CCTCC NO:M209170; Described BDSM08 is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on August 7th, 2009, and deposit number is CCTCC NO:M209171; Described BDFM05 is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on August 7th, 2009, and deposit number is CCTCC NO:M209172.
The mode of the described collection thalline of step (1) is preferably by centrifugation and obtains, and centrifugal condition is 2～15 ℃, the centrifugal 15～35min of 5000～8000rpm;
The concentration of the described host bacterium of step (1) suspension is preferably 10 17～10 22Cfu/mL;
The described Bdellovibrio spot of step (2) adopts ordinary method (be 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ") to separate and obtains.
It is 0.1～0.3mol/L that each described phosphate buffered saline buffer of step (1)～(3) is preferably concentration, and pH is 7.2～7.6 phosphate buffered saline buffer;
The concentration of the described Bdellovibrio telotroch of step (2) concentrated solution is preferably 10 6～10 9Pfu/mL;
When the described Bdellovibrio of step (3) derived from salt water environment, described solvent was DNB liquid nutrient medium or distilled water, and the mass volume ratio concentration of described sodium chloride solution is 25～30g/L;
When the described Bdellovibrio of step (3) derived from degree of saltiness water surrounding, described solvent was DNB liquid nutrient medium or distilled water, and the mass volume ratio concentration of described sodium chloride solution is 5～10g/L;
When the described Bdellovibrio of step (3) derives from fresh water environment, do not add sodium-chlor;
The condition optimization of the described sterilization of step (3) is 121 ℃ of sterilization 20min;
The concentration of the described Bdellovibrio preparation of step (3) is 10 8～10 12Pfu/mL;
The described DNB liquid nutrient medium of step (3) is that nutrient broth 0.8g, caseinic acid hydrolyzate 0.5g and yeast extract 0.1g are dissolved in the 1000mL distilled water, regulates pH value to 7.2～7.6.
A kind of Bdellovibrio preparation is prepared by the fermentation process of described Bdellovibrio preparation;
Described Bdellovibrio preparation can reach the purpose of control germ evil by other pathogenic bacterium of cracking or potentially pathogenic organism.Described Bdellovibrio preparation not only can directly be made preparation, also can make simple telotroch preparation, leech liposome preparation and their preparation that is mixed in proportion by further centrifugal.
The present invention has following advantage and effect with respect to prior art:
(1) the host bacterium of adopting in the fermentation process of the present invention is gram-positive microorganism useful or environmental sound.Like this, on the one hand, can keep even improve the ability of some Gram-negative bacterias of Bdellovibrio cracking, and experiment showed, that the Bdellovibrio preparation that makes with this method improves to the cracking ability of pathogenic bacterium; On the other hand, prepared Bdellovibrio preparation can directly use, and need not through more fermentation aftertreatment; Moreover because the host is probiotics or the bacterial strain of environmental sound, the use range of said preparation also increases greatly.
(2) the present invention is when obtaining high density Bdellovibrio bacterium liquid, relatively also shortened fermentation period, the effective like this fermentation time that solved is long and energy consumption that cause is excessive, the problem that production cost is too high, not only cost is low for the Bdellovibrio preparation that obtains, and active high.
Description of drawings
Fig. 1 is that the Bdellovibrio preparation that makes with two kinds of different hosts (subtilis and intestinal bacteria) fermentation is to cracking ability-time diagram of Salmonella typhimurium and streptococcus aureus.
Fig. 2 is that the Bdellovibrio preparation that makes with two kinds of different hosts (bacillus natto and intestinal bacteria) fermentation is to cracking ability-time diagram of listeria monocytogenes and Salmonella choleraesuls.
Fig. 3 is that the Bdellovibrio preparation that makes with two kinds of different hosts (bifidumbacterium bifidum and Salmonella typhimurium) fermentation is to cracking ability-time diagram of streptococcus suis II and streptococcus uberis.
Fig. 4 is that the Bdellovibrio preparation that makes with two kinds of different hosts (enterococcus faecalis and Salmonella choleraesuls) fermentation is to staphylococcus epidermidis and colibacillary cracking ability-time diagram.
Fig. 5 is that the Bdellovibrio preparation that makes with two kinds of different hosts (lactobacillus bulgaricus and intestinal bacteria) fermentation is to cracking ability-time diagram of streptococcus equisimilis and Salmonella typhimurium.
Fig. 6 is that the Bdellovibrio preparation that makes with two kinds of different hosts (pediococcus acidilactici and Aeromonas hydrophila) fermentation is to streptococcus uberis and colibacillary cracking ability-time diagram.
Fig. 7 is that the Bdellovibrio preparation that makes with two kinds of different hosts (streptococcus acidi lactici and pig hammer II type) fermentation is to the cracking ability-time diagram of Salmonella choleraesuls and staphylococcus epidermidis.
Fig. 8 is that the Bdellovibrio preparation that makes with two kinds of different hosts (faecium and intestinal bacteria) fermentation is to the cracking ability-time diagram of Salmonella typhimurium and listeria monocytogenes.
Fig. 9 is that the Bdellovibrio preparation that makes with two kinds of different hosts (Bacillus licheniformis and intestinal bacteria) fermentation is to the cracking ability-time diagram of Aeromonas hydrophila and streptococcus equisimilis.
Figure 10 is that the Bdellovibrio preparation that makes with two kinds of different hosts (Lactobacterium acidophilum and intestinal bacteria) fermentation is to cracking ability-time diagram of streptococcus aureus and Salmonella choleraesuls.
Figure 11 is that the Bdellovibrio preparation that makes with two kinds of different hosts (lactobacterium casei and Aeromonas hydrophila) fermentation is to streptococcus equisimilis and colibacillary cracking ability-time diagram.
Figure 12 is that the Bdellovibrio preparation that makes with two kinds of different hosts (lactobacillus lactis and pig hammer II type) fermentation is to cracking ability-time diagram of staphylococcus epidermidis and Aeromonas hydrophila.
Figure 13 is that the Bdellovibrio preparation that makes with two kinds of different hosts (plant lactobacillus and Salmonella choleraesuls) fermentation is to cracking ability-time diagram of streptococcus agalactiae and Salmonella typhimurium.
Figure 14 is that the Bdellovibrio preparation that makes with two kinds of different hosts (Pediococcus pentosaceus and intestinal bacteria) fermentation is to the cracking ability-time diagram of streptococcus uberis and suis II type.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Embodiment 1
Respectively with subtilis (bacterium numbering: GIM1.136, derive from microbial strains preservation center, Guangdong Province) and intestinal bacteria (Escherichia coli, bacterium numbering: GIM1.137, derive from microbial strains preservation center, Guangdong Province) for the host bacterium prepares Bdellovibrio preparation A and Bdellovibrio preparation B, detailed process is as follows:
(1) preparation of bacillus subtilis bacteria suspension
Subtilis is inoculated in (peptone 10g in the nutrient broth medium, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2), place 33 ℃ of shaking tables to cultivate 18h, make it be in logarithmic phase, nutrient solution under 4 ℃ of conditions, the centrifugal 25min of 5000rpm, keep the precipitation abandoning supernatant, (concentration is 0.2mol/L, and pH7.6), obtaining concentration is 10 to add the potassium-sodium phosphates salt buffer in the precipitation 19The bacillus subtilis suspended liquid of cfu/mL, it is standby to place 4 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 19The intestinal bacteria suspension of cfu/mL, it is standby to place 4 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.2mol/L, adds the intestinal bacteria suspension of step (1) preparation in pH7.6), and adjusting colibacillary concentration is 10 at the potassium-sodium phosphates salt buffer 12Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 14th, 2008 from the Bdellovibrio BDJ02(of seawater, deposit number is CCTCC NO:M208012) spot, then this nutrient solution is cultivated 48h at 30 ℃, again at 4 ℃, the centrifugal 35min of 5000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 4 ℃, the centrifugal 30min of 13000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.2mol/L, the potassium-sodium phosphates salt buffer of pH7.6, the concentration of adjusting the Bdellovibrio telotroch is 10 8Pfu/mL obtains Bdellovibrio BDJ02 telotroch concentrated solution, and it is standby to place 2 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
Add sodium-chlor in the DNB liquid nutrient medium, the adding quality of sodium-chlor is 2.5% of DNB liquid nutrient medium volume, the fermentor tank of packing into, and 121 ℃ of sterilization 20min obtain fermention medium; Add the bacillus subtilis suspended liquid of step (1) preparation and the Bdellovibrio BDJ02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the subtilis in the fermention medium is 10 12Cfu/mL, Bdellovibrio initial concentration are 10 2Pfu/mL ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 28 ℃; Add the fermention medium pH value control during the fermentation of bacillus subtilis suspended liquid and Bdellovibrio telotroch concentrated solution 7.6; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 28%; Add bacillus subtilis suspended liquid in the culturing process twice, add 15h pitch time of bacillus subtilis suspended liquid at every turn, the amount that at every turn adds bacillus subtilis suspended liquid is 10 with the concentration of initiate subtilis in fermention medium 12Cfu/mL is as the criterion, and it is 1 * 10 that fermentation culture 48h namely makes concentration 9The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the intestinal bacteria suspension of step (1) preparation and the Bdellovibrio BDJ02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 1 * 10 9The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the Aeromonas of Bdellovibrio preparation B, Salmonellas, streptococcus aureus all have good lytic effect.Respectively with to the negative Salmonella typhimurium of gram (Salmonella typhimurium, strain number: GIM1.237, derive from microbial strains preservation center, Guangdong Province) and to the positive streptococcus aureus of gram (Staphylococcus aureus, strain number: GIM1.142 derives from microbial strains preservation center, Guangdong Province) be cracked into example.Be equipped with 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, add the bacterial sediment that conventional cultural method obtains Salmonella typhimurium and streptococcus aureus respectively, every kind of bacterium has two bottles.Regulate the cell concentration unanimity (10 of 4 bottles of damping fluids 11Cfu/mL).In two bottles of buffer systems that contain Salmonella typhimurium, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, in two bottles of buffer systems that contain streptococcus aureus, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, 36h, 42h, these nine moment of 48h, by 10 -1～10 -11Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in Figure 1.As can be seen from Figure 1, compare with the Bdellovibrio preparation B that obtains with Escherichia coli fermentation, Bdellovibrio preparation A with fermentation of bacillus subtilis not only has stronger lytic effect to the negative Salmonella typhimurium of gram, and also good than Bdellovibrio preparation B to the lytic effect of the positive streptococcus aureus of gram.In addition, the Bdellovibrio preparation A that is made by subtilis not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 2
Prepare Bdellovibrio preparation A and Bdellovibrio preparation B with bacillus natto (bacterium numbering: CGMCC1.1086 derives from China Committee for Culture Collection of Microorganisms common micro-organisms center) and intestinal bacteria for the host bacterium, detailed process is as follows:
(1) preparation of bacillus natto suspension
Bacillus natto is inoculated in nutrient broth medium (peptone 10g, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2) in, place 35 ℃ of shaking tables to cultivate 15h, make it be in logarithmic phase, nutrient solution under 4 ℃ of conditions, the centrifugal 25min of 6000rpm, keep the precipitation abandoning supernatant, (concentration is 0.1mol/L, and pH7.4), obtaining concentration is 10 to add the sodium phosphate salt damping fluid in the precipitation 18The bacillus natto suspension of cfu/mL, it is standby to place 2 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 18The intestinal bacteria suspension of cfu/mL, it is standby to place 2 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.1mol/L, adds the intestinal bacteria suspension of step (1) preparation in pH7.4), and adjusting colibacillary concentration is 10 at the sodium phosphate salt damping fluid 13Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 13rd, 2008 from the Bdellovibrio BDF02(of fresh water, deposit number is CCTCC NO:M208009) spot, then this nutrient solution is cultivated 45h at 30 ℃, again at 4 ℃, the centrifugal 25min of 6000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 4 ℃, the centrifugal 28min of 14000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.1mol/L, the sodium phosphate salt damping fluid of pH7.4, the concentration of adjusting the Bdellovibrio telotroch is 10 9Pfu/mL obtains Bdellovibrio BDF02 telotroch concentrated solution, and it is standby to place 4 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
With the DNB liquid nutrient medium fermentor tank of packing into, 121 ℃ of sterilization 20min obtain fermention medium; Add the bacillus natto suspension of step (1) preparation and the Bdellovibrio BDF02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the bacillus natto in the fermention medium is 10 13Cfu/mL, Bdellovibrio initial concentration are 10 2Pfu/mL ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 29 ℃; Add the fermention medium pH value control during the fermentation of bacillus natto suspension and Bdellovibrio telotroch concentrated solution 7.4; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 28%; Add bacillus natto suspension in the culturing process twice, add 16h pitch time of bacillus natto suspension at every turn, the amount that at every turn adds bacillus natto suspension is for being 10 with the concentration of initiate bacillus natto in fermention medium 13Cfu/mL is as the criterion, and it is 1 * 10 that fermentation culture 45h namely makes concentration 10The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the intestinal bacteria suspension of step (1) preparation and the Bdellovibrio BDF02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 1 * 10 10The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the Aeromonas of Bdellovibrio preparation B, Salmonellas, listeria monocytogenes have good lytic effect.Respectively with to the positive listeria monocytogenes of gram (Listeria monocytohenes, strain number: GIM1.228, derive from microbial strains preservation center, Guangdong Province) cracking and to the negative Salmonella choleraesuls of gram (Salmonella enterica, strain number: GIM1.244 derives from microbial strains preservation center, Guangdong Province) be cracked into example.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, add the bacterial sediment that conventional cultural method obtains listeria monocytogenes and Salmonella choleraesuls respectively, each two bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating 4 bottles of damping fluids 10Cfu/mL).In two bottles of buffer systems that contain listeria monocytogenes, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, in two bottles of buffer systems that contain Salmonella choleraesuls, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1m respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, these eight moment of 36h, 42h, by 10 -1～10 -10Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in Figure 2.As can be seen from Figure 2, compare with the Bdellovibrio preparation B with Escherichia coli fermentation, Bdellovibrio preparation A with bacillus natto to ferment not only has stronger lytic effect to the negative Salmonella choleraesuls of gram, and also better than Bdellovibrio preparation B to the lytic effect of the positive listeria monocytogenes of gram.In addition, the Bdellovibrio preparation A that is made by bacillus natto not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 3
Prepare Bdellovibrio preparation A and Bdellovibrio preparation B with bifidumbacterium bifidum (bacterium numbering: GIM1.169 derives from microbial strains preservation center, Guangdong Province) and Salmonella typhimurium for the host bacterium respectively, detailed process is as follows:
(1) preparation of bifidumbacterium bifidum suspension
Bifidumbacterium bifidum is inoculated in the PTYG substratum, place 37 ℃ of shaking tables to cultivate 24h, make it be in logarithmic phase, nutrient solution is under 8 ℃ of conditions, the centrifugal 20min of 7000rpm keeps the precipitation abandoning supernatant, and (concentration is 0.3mol/L to adding potassium phosphate salt damping fluid in the precipitation, pH7.5), obtaining concentration is 10 22The bifidumbacterium bifidum suspension of cfu/mL, it is standby to place 8 ℃ of refrigerators to preserve then;
The same method, preparing concentration with nutrient broth medium is 10 22The Salmonella typhimurium suspension of cfu/mL, it is standby to place 8 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.3mol/L, adds the Salmonella typhimurium suspension of step (1) preparation in pH7.5), and the concentration of adjusting Salmonella typhimurium is 10 at the potassium phosphate salt damping fluid 10Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on August 7th, 2009 from the Bdellovibrio BDS02(of soil, deposit number is CCTCC NO:M209170) spot, then this nutrient solution is cultivated 50h at 30 ℃, again at 8 ℃, the centrifugal 20min of 7000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 8 ℃, the centrifugal 20min of 16000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.3mol/L, the potassium phosphate salt damping fluid of pH7.5, the concentration of adjusting the Bdellovibrio telotroch is 10 9Pfu/mL obtains Bdellovibrio BDS02 telotroch concentrated solution, and it is standby to place 15 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
Add sodium-chlor at the DNB liquid nutrient medium, the adding quality of sodium-chlor is 0.7% of DNB liquid nutrient medium volume, the fermentor tank of packing into, and 121 ℃ of sterilization 20min obtain fermention medium; Add the bifidumbacterium bifidum suspension of step (1) preparation and the Bdellovibrio BDS02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the bifidumbacterium bifidum in the fermention medium is 10 15Cfu/mL, Bdellovibrio initial concentration are 10 3Pfu/mL ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 30 ℃; Add the fermention medium pH value control during the fermentation of bifidumbacterium bifidum suspension and Bdellovibrio telotroch concentrated solution 7.2; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 22%; Add bifidumbacterium bifidum suspension in the culturing process one time, add 12h pitch time of bifidumbacterium bifidum suspension at every turn, the amount that at every turn adds bifidumbacterium bifidum suspension is 10 with the concentration of initiate bifidumbacterium bifidum in fermention medium 15Cfu/mL is as the criterion, and it is 5 * 10 that fermentation culture 36h namely makes concentration 11The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the Salmonella typhimurium suspension of step (1) preparation and the Bdellovibrio BDS02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 5 * 10 11The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the streptococcus uberis of Bdellovibrio preparation B, Salmonellas, swine streptococcus all have lytic effect.Respectively with to the negative streptococcus suis II of gram (Streptococcus suis, strain number: CVCC3306, derive from national veterinary microorganism DSMZ) and to the positive streptococcus uberis of gram (Streptococcus uberis, strain number: 700407, derive from Shanghai three and step on Science and Technology Ltd.) be cracked into example.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, add the bacterial sediment that conventional cultural method obtains streptococcus suis II and streptococcus uberis respectively, each two bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating 4 bottles of damping fluids 11Cfu/mL).In two bottles of buffer systems that contain streptococcus suis II, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, in two bottles of buffer systems that contain streptococcus uberis, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, 36h, 42h, these nine moment of 48h, by 10 -1～10 -11Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in Figure 3.As can be seen from Figure 3, compare with the Bdellovibrio preparation B with the Salmonella typhimurium fermentation, Bdellovibrio preparation A with the bifidumbacterium bifidum fermentation not only has stronger lytic effect to the negative streptococcus suis II of gram, and also better than Bdellovibrio preparation B to the lytic effect of the positive streptococcus uberis of gram.In addition, the Bdellovibrio preparation A that is made by bifidumbacterium bifidum not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 4
Respectively with enterococcus faecalis (Enterococcus faecalis, bacterium numbering: CGMCC1.131, derive from China Committee for Culture Collection of Microorganisms common micro-organisms center) and Salmonella choleraesuls prepare Bdellovibrio preparation A and Bdellovibrio preparation B for the host bacterium, detailed process is as follows:
(1) preparation of enterococcus faecalis suspension
Enterococcus faecalis is inoculated in nutrient broth medium (peptone 10g, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2) in, place 30 ℃ of shaking tables to cultivate 24h, make it be in logarithmic phase, nutrient solution under 4 ℃ of conditions, the centrifugal 20min of 6000rpm, keep the precipitation abandoning supernatant, (concentration is 0.2mol/L, and pH7.4), obtaining concentration is 10 to add the sodium phosphate salt damping fluid in the precipitation 20The enterococcus faecalis suspension of cfu/mL, it is standby to place 2～4 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 20The Salmonella choleraesuls suspension of cfu/mL, it is standby to place 2～4 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.2mol/L, adds the Salmonella choleraesuls suspension of step (1) preparation in pH7.4), and the concentration of adjusting Salmonella choleraesuls is 10 at the sodium phosphate salt damping fluid 12Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on August 7th, 2009 from the Bdellovibrio BDFM05(of soil, deposit number is CCTCC NO:M209172) spot, then this nutrient solution is cultivated 38h at 30 ℃, again at 4 ℃, the centrifugal 20min of 6000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 4 ℃, the centrifugal 22min of 15000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.2mol/L, the sodium phosphate salt damping fluid of pH7.4, the concentration of adjusting the Bdellovibrio telotroch is 10 9Pfu/mL obtains Bdellovibrio BDFM05 telotroch concentrated solution, and it is standby to place 4 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
The sodium phosphate salt damping fluid (concentration is 0.2mol/L, pH7.6), the fermentor tank of packing into, 121 ℃ the sterilization 20min, obtain fermention medium; Add the enterococcus faecalis suspension of step (1) preparation and the Bdellovibrio BDFM05 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the enterococcus faecalis in the fermention medium is 10 14Cfu/mL, Bdellovibrio initial concentration are 10 2Pfu/mL ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 30 ℃; Add the fermention medium pH value control during the fermentation of enterococcus faecalis suspension and Bdellovibrio telotroch concentrated solution 7.2; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 30%; Add enterococcus faecalis suspension in the culturing process twice, add 18h pitch time of enterococcus faecalis suspension at every turn, the amount that at every turn adds enterococcus faecalis suspension is 10 with the concentration of initiate enterococcus faecalis in fermention medium 14Cfu/mL is as the criterion, and it is 5 * 10 that fermentation culture 48h namely makes concentration 10The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the Salmonella choleraesuls suspension of step (1) preparation and the Bdellovibrio BDFM05 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 5 * 10 10The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the intestinal bacteria of Bdellovibrio preparation B, Salmonellas, staphylococcus epidermidis all have lytic effect.Respectively with to the positive staphylococcus epidermidis of gram (Staphylococcus epidermidis, strain number: GIM1.143 derive from microbial strains preservation center, Guangdong Province) with to the negative colibacillary example that is cracked into of gram.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, respectively add conventional cultural method respectively and obtain staphylococcus epidermidis and colibacillary bacterial sediment, two bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating 4 bottles of damping fluids 12Cfu/mL).In two bottles of buffer systems that contain staphylococcus epidermidis, add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, contain in the colibacillary buffer system at two bottles, add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, 36h, 42h, these nine moment of 48h, by 10 -1～10 -12Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in Figure 4.As can be seen from Figure 4, compare with the Bdellovibrio preparation B with the Salmonella choleraesuls fermentation, Bdellovibrio preparation A with the enterococcus faecalis fermentation not only has stronger lytic effect to the negative intestinal bacteria of gram, and also better than Bdellovibrio preparation B to the lytic effect of the positive staphylococcus epidermidis of gram.In addition, the Bdellovibrio preparation A that is made by enterococcus faecalis not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 5
Prepare Bdellovibrio preparation A and Bdellovibrio preparation B with lactobacillus bulgaricus (bacterium numbering: GIM1.80 derives from microbial strains preservation center, Guangdong Province) and intestinal bacteria for the host bacterium respectively, detailed process is as follows:
(1) preparation of lactobacillus bulgaricus suspension
Lactobacillus bulgaricus is inoculated in nutrient broth medium (peptone 10g, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2) in, place 37 ℃ of shaking tables to cultivate 20h, make it be in logarithmic phase, nutrient solution under 10 ℃ of conditions, the centrifugal 25min of 6000rpm, keep the precipitation abandoning supernatant, (concentration is 0.3mol/L, and pH7.3), obtaining concentration is 10 to add the potassium phosphate salt damping fluid in the precipitation 17The lactobacillus bulgaricus suspension of cfu/mL, it is standby to place 2～4 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 17The intestinal bacteria suspension of cfu/mL, it is standby to place 2～4 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.3mol/L, adds the intestinal bacteria suspension of step (1) preparation in pH7.3), and adjusting colibacillary concentration is 10 at the potassium phosphate salt damping fluid 13Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 14th, 2008 from the Bdellovibrio BDJ02(of seawater, deposit number is CCTCC NO:M208012) spot, then this nutrient solution is cultivated 40h at 30 ℃, again at 10 ℃, the centrifugal 25min of 6000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 15 ℃, the centrifugal 20min of 15000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.3mol/L, the potassium phosphate salt damping fluid of pH7.3, the concentration of adjusting the Bdellovibrio telotroch is 10 8Pfu/mL obtains Bdellovibrio BDJ02 telotroch concentrated solution, and it is standby to place 2 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
Add sodium-chlor in distilled water, the adding quality of sodium-chlor is 2.8% of distilled water volume, the fermentor tank of packing into, and 121 ℃ of sterilization 20min obtain fermention medium; Add the lactobacillus bulgaricus suspension of step (1) preparation and the Bdellovibrio BDJ02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the lactobacillus bulgaricus in the fermention medium is 10 13Cfu/mL, the Bdellovibrio initial concentration is 10pfu/mL, ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 28 ℃; Add the fermention medium pH value control during the fermentation of lactobacillus bulgaricus suspension and Bdellovibrio telotroch concentrated solution 7.6; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 21%; Add lactobacillus bulgaricus suspension in the culturing process 2 times, add 18h pitch time of lactobacillus bulgaricus suspension at every turn, the amount that at every turn adds lactobacillus bulgaricus suspension is 10 with the concentration of initiate lactobacillus bulgaricus in fermention medium 13Cfu/mL is as the criterion, and it is 1 * 10 that fermentation culture 40h namely makes concentration 11The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the intestinal bacteria suspension of step (1) preparation and the Bdellovibrio BDJ02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 1 * 10 11The Bdellovibrio preparation B of pfu/mL.
This preparation has good lytic effect to pathogenic bacterium such as Aeromonas, Salmonellas, streptococcus equisimilises.Respectively with to the positive streptococcus equisimilis of gram (Streptococcus equinus, strain number: cvcc1925 derive from national veterinary microorganism DSMZ) with to the example that is cracked into of the negative Salmonella typhimurium of gram.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, respectively add the bacterial sediment that conventional cultural method obtains streptococcus equisimilis and Salmonella typhimurium respectively, two bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating two bottles of damping fluids 11Cfu/mL).In two bottles of buffer systems that contain streptococcus equisimilis, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, in two bottles of buffer systems that contain Salmonella typhimurium, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL bacterium respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, these eight moment of 36h, 42h, by 10 -1～10 -10Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in Figure 5.As can be seen from Figure 5, compare with the Bdellovibrio preparation B with Escherichia coli fermentation, Bdellovibrio preparation A with fermentation using lactobacillus bulgaricus not only has stronger lytic effect to the negative Salmonella typhimurium of gram, and also better than Bdellovibrio preparation B to the positive streptococcus equisimilis streptococcus equisimilis lytic effect of gram.In addition, the Bdellovibrio preparation A that is made by lactobacillus bulgaricus not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 6
Respectively with pediococcus acidilactici (bacterium numbering: GIM1.263, derive from microbial strains preservation center, Guangdong Province) and Aeromonas hydrophila (Aeromonas hydrophila, bacterium numbering: GIM1.172, derive from microbial strains preservation center, Guangdong Province) for the host bacterium prepares Bdellovibrio preparation A and Bdellovibrio preparation B, detailed process is as follows:
(1) preparation of pediococcus acidilactici suspension
Pediococcus acidilactici is inoculated in nutrient broth medium (peptone 10g, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2) in, place 30 ℃ of shaking tables to cultivate 18h, make it be in logarithmic phase, nutrient solution under 5 ℃ of conditions, the centrifugal 15min of 7000rpm, keep the precipitation abandoning supernatant, (concentration is 0.1mol/L, and pH7.4), obtaining concentration is 10 to add the sodium phosphate salt damping fluid in the precipitation 22The pediococcus acidilactici suspension of cfu/mL, it is standby to place 15 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 22The Aeromonas hydrophila suspension of cfu/mL, it is standby to place 15 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.1mol/L, adds the Aeromonas hydrophila suspension of step (1) preparation in pH7.4), and the concentration of adjusting Aeromonas hydrophila is 10 at the sodium phosphate salt damping fluid 15Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 13rd, 2008 from the Bdellovibrio BDF03(of fresh water, deposit number is CCTCC NO:M208010) spot, then this nutrient solution is cultivated 54h at 30 ℃, again at 5 ℃, the centrifugal 20min of 7000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 5 ℃, the centrifugal 25min of 15000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.1mol/L, the sodium phosphate salt damping fluid of pH7.4, the concentration of adjusting the Bdellovibrio telotroch is 10 9Pfu/mL obtains Bdellovibrio BDF03 telotroch concentrated solution, and it is standby to place 10 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
With the distilled water fermentor tank of packing into, 121 ℃ of sterilization 20min obtain fermention medium; Add the pediococcus acidilactici suspension of step (1) preparation and the Bdellovibrio BDF03 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the pediococcus acidilactici in the fermention medium is 10 14Cfu/mL, the Bdellovibrio initial concentration is 10pfu/mL, ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 30 ℃; Add the fermention medium pH value control during the fermentation of pediococcus acidilactici suspension and Bdellovibrio telotroch concentrated solution 7.4; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 24%; Add pediococcus acidilactici suspension in the culturing process twice, add 15h pitch time of pediococcus acidilactici suspension at every turn, the amount that at every turn adds pediococcus acidilactici suspension is 10 with the concentration of initiate pediococcus acidilactici in fermention medium 14It is 5 * 10 that cfu/mL, fermentation culture 45h namely make concentration 8Bdellovibrio preparation A.
Same quadrat method adds the Aeromonas hydrophila suspension of step (1) preparation and the Bdellovibrio BDF03 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 5 * 10 8Bdellovibrio preparation B.
Pathogenic bacterium such as this Bdellovibrio preparation A and the intestinal bacteria of Bdellovibrio preparation B, Salmonellas, streptococcus uberis have good lytic effect.Respectively with to streptococcus uberis and the colibacillary example that is cracked into.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, respectively add conventional cultural method respectively and obtain streptococcus uberis and colibacillary bacterial sediment, 2 bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating 4 bottles of damping fluids 10Cfu/mL).In two bottles of buffer systems that contain streptococcus uberis, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, contain in the colibacillary buffer system at two bottles, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, 36h, 42h, these nine moment of 48h, by 10 -1～10 -10Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in Figure 6.As can be seen from Figure 6, compare with the Bdellovibrio preparation B with the Aeromonas hydrophila fermentation, Bdellovibrio preparation A with the pediococcus acidilactici fermentation not only has stronger lytic effect to the negative intestinal bacteria of gram, and also better than Bdellovibrio preparation B to the lytic effect of the positive streptococcus uberis of gram.In addition, the Bdellovibrio preparation A that is made by pediococcus acidilactici not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 7
Prepare Bdellovibrio preparation A and Bdellovibrio preparation B with streptococcus acidi lactici (bacterium numbering: GIM1.156 derives from microbial strains preservation center, Guangdong Province) and streptococcus suis II for the host bacterium respectively, detailed process is as follows:
(1) preparation of streptococcus acidi lactici suspension
Streptococcus acidi lactici is inoculated in nutrient broth medium (peptone 10g, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2) in, place 37 ℃ of shaking tables to cultivate 18h, make it be in logarithmic phase, nutrient solution under 4 ℃ of conditions, the centrifugal 27min of 6000rpm, keep the precipitation abandoning supernatant, (concentration is 0.2mol/L, and pH7.5), obtaining concentration is 10 to add the potassium phosphate salt damping fluid in the precipitation 20The streptococcus acidi lactici suspension of cfu/mL, it is standby to place 4 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 20The streptococcus suis II suspension of cfu/mL, it is standby to place 4 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.2mol/L, adds the streptococcus suis II suspension of step (1) preparation in pH7.5), and the concentration of adjusting streptococcus suis II is 10 at the potassium phosphate salt damping fluid 15Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, waiting to contain on the double-deck agar plate of host bacterium and plaque occurs) the Bdellovibrio BDSM08(that cultivates the separation soil that comes out is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on August 7th, 2009, deposit number is CCTCC NO:M209171) spot, then this nutrient solution is cultivated 60h at 30 ℃, again at 4 ℃, the centrifugal 20min of 6000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 4 ℃, the centrifugal 25min of 16000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.2mol/L, the potassium phosphate salt damping fluid of pH7.5, the concentration of adjusting the Bdellovibrio telotroch is 10 7Pfu/mL obtains Bdellovibrio BDSM08 telotroch concentrated solution, and it is standby to place 4 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
Add sodium-chlor in the pH value is 7.2 DNB liquid nutrient medium, the adding quality of sodium-chlor is 1.5% of DNB liquid nutrient medium volume, the fermentor tank of packing into, and 121 ℃ of sterilization 20min obtain fermention medium; Add the streptococcus acidi lactici suspension of step (1) preparation and the Bdellovibrio BDSM08 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the streptococcus acidi lactici in the fermention medium is 10 13Cfu/mL, Bdellovibrio initial concentration are 10 2Pfu/mL ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 30 ℃; Add the fermention medium pH value control during the fermentation of streptococcus acidi lactici suspension and Bdellovibrio telotroch concentrated solution 7.5; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 27%; Add streptococcus acidi lactici suspension in the culturing process 2 times, add 14h pitch time of streptococcus acidi lactici suspension at every turn, the amount that at every turn adds streptococcus acidi lactici suspension is 10 with the concentration of initiate streptococcus acidi lactici in fermention medium 13Cfu/mL is as the criterion, and it is 5 * 10 that fermentation culture 42h namely makes concentration 9The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the streptococcus suis II suspension of step (1) preparation and the Bdellovibrio BDSM08 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 5 * 10 9The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the Aeromonas of Bdellovibrio preparation B, Salmonellas, staphylococcus epidermidis all have lytic effect.Respectively with the example that is cracked into to Salmonella choleraesuls and staphylococcus epidermidis.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, respectively add the bacterial sediment that conventional cultural method obtains Salmonella choleraesuls and staphylococcus epidermidis respectively, 2 bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating 4 bottles of damping fluids 10Cfu/mL).In two bottles of buffer systems that contain Salmonella choleraesuls, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, in two bottles of buffer systems that contain staphylococcus epidermidis, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, 36h, 42h, these nine moment of 48h, by 10 -1～10 -10Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in Figure 7.As can be seen from Figure 7, compare with the Bdellovibrio preparation B with the streptococcus suis II fermentation, Bdellovibrio preparation A with the streptococcus acidi lactici fermentation not only has stronger lytic effect to the negative Salmonella choleraesuls of gram, and also better than Bdellovibrio preparation B to the lytic effect of the positive staphylococcus epidermidis of gram.In addition, the Bdellovibrio preparation A that is made by streptococcus acidi lactici not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 8
Prepare Bdellovibrio preparation A and Bdellovibrio preparation B with faecium (bacterium numbering: CGMCC1.2136 derives from China Committee for Culture Collection of Microorganisms common micro-organisms center) and intestinal bacteria for the host bacterium respectively, detailed process is as follows:
(1) preparation of faecium suspension
Faecium is inoculated in nutrient broth medium (peptone 10g, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2) in, place 32 ℃ of shaking tables to cultivate 24h, make it be in logarithmic phase, nutrient solution under 4 ℃ of conditions, the centrifugal 20min of 5000rpm, keep the precipitation abandoning supernatant, (concentration is 0.2mol/L, and pH7.5), obtaining concentration is 10 to add the potassium phosphate salt damping fluid in the precipitation 18The faecium suspension of cfu/mL, it is standby to place 4 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 18The intestinal bacteria suspension of cfu/mL, it is standby to place 4 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.2mol/L, adds the intestinal bacteria suspension of step (1) preparation in pH7.5), and adjusting colibacillary concentration is 10 at the potassium phosphate salt damping fluid 15Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 14th, 2008 from the Bdellovibrio BDJ02(of seawater, deposit number is CCTCC NO:M208012) spot, then this nutrient solution is cultivated 60h at 30 ℃, again at 4 ℃, the centrifugal 20min of 6000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 4 ℃, the centrifugal 25min of 16000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.2mol/L, the potassium phosphate salt damping fluid of pH7.5, the concentration of adjusting the Bdellovibrio telotroch is 10 6Pfu/mL obtains Bdellovibrio BDJ02 telotroch concentrated solution, and it is standby to place 4 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
Add sodium-chlor in the pH value is 7.2 DNB liquid nutrient medium, the adding quality of sodium-chlor is 2.7% of DNB liquid nutrient medium volume, the fermentor tank of packing into, and 121 ℃ of sterilization 20min obtain fermention medium; Add the faecium suspension of step (1) preparation and the Bdellovibrio BDJ02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the faecium in the fermention medium is 10 13Cfu/mL, Bdellovibrio initial concentration are 10 3Pfu/mL ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 30 ℃; Add the fermention medium pH value control during the fermentation of faecium suspension and Bdellovibrio telotroch concentrated solution 7.3; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 26%; Add faecium suspension in the culturing process twice, add 14h pitch time of faecium suspension at every turn, the amount that at every turn adds faecium suspension is 10 with the concentration of initiate faecium in fermention medium 13Cfu/mL is as the criterion, and it is 1 * 10 that fermentation culture 42h namely makes concentration 9The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the intestinal bacteria suspension of step (1) preparation and the Bdellovibrio BDJ02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 1 * 10 9The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the Aeromonas of Bdellovibrio preparation B, Salmonellas, listeria monocytogenes all have lytic effect.Respectively with the example that is cracked into to listeria monocytogenes and Salmonella typhimurium.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, respectively add the bacterial sediment that conventional cultural method obtains listeria monocytogenes and Salmonella typhimurium respectively, 2 bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating 4 bottles of damping fluids 11Cfu/mL).In two bottles of buffer systems that contain listeria monocytogenes, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, in two bottles of buffer systems that contain Salmonella typhimurium, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, these eight moment of 36h, 42h, by 10 -1～10 -11Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in Figure 8.As can be seen from Figure 8, compare with the Bdellovibrio preparation B with Escherichia coli fermentation, Bdellovibrio preparation A with the faecium fermentation not only has stronger lytic effect to the negative Salmonella typhimurium of gram, and also better than Bdellovibrio preparation B to the lytic effect of the positive listeria monocytogenes of gram.In addition, the Bdellovibrio preparation A that is made by faecium not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 9
Prepare Bdellovibrio preparation A and Bdellovibrio preparation B with Bacillus licheniformis (bacterium numbering: GIM1.182 derives from microbial strains preservation center, Guangdong Province) and intestinal bacteria for the host bacterium respectively, detailed process is as follows:
(1) preparation of Bacillus licheniformis suspension
Bacillus licheniformis is inoculated in (peptone 10g in the nutrient broth medium, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2), place 33 ℃ of shaking tables to cultivate 18h, make it be in logarithmic phase, nutrient solution under 4 ℃ of conditions, the centrifugal 25min of 5000rpm, keep the precipitation abandoning supernatant, (concentration is 0.2mol/L, and pH7.6), obtaining concentration is 10 to add the potassium-sodium phosphates salt buffer in the precipitation 19The Bacillus licheniformis suspension of cfu/mL, it is standby to place 4 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 19The intestinal bacteria suspension of cfu/mL, it is standby to place 4 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.2mol/L, adds the intestinal bacteria suspension of step (1) preparation in pH7.6), and adjusting colibacillary concentration is 10 at the potassium-sodium phosphates salt buffer 12Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on April 28th, 2008 from the Bdellovibrio BDM01(of seawater, deposit number is CCTCC NO:M208066) spot, then this nutrient solution is cultivated 48h at 30 ℃, again at 4 ℃, the centrifugal 30min of 5000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 4 ℃, the centrifugal 30min of 13000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.2mol/L, the potassium-sodium phosphates salt buffer of pH7.6, the concentration of adjusting the Bdellovibrio telotroch is 10 8Pfu/mL obtains Bdellovibrio BDM01 telotroch concentrated solution, and it is standby to place 4 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
Add sodium-chlor in the DNB liquid nutrient medium, the adding quality of sodium-chlor is 3.0% of DNB liquid nutrient medium volume, the fermentor tank of packing into, and 121 ℃ of sterilization 20min obtain fermention medium; Add the Bacillus licheniformis suspension of step (1) preparation and the Bdellovibrio BDM01 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the Bacillus licheniformis in the fermention medium is 10 12Cfu/mL, Bdellovibrio initial concentration are 10 2Pfu/mL ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 30 ℃; Add the fermention medium pH value control during the fermentation of Bacillus licheniformis suspension and Bdellovibrio telotroch concentrated solution 7.2; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 28%; Add Bacillus licheniformis suspension in the culturing process twice, add 15h pitch time of Bacillus licheniformis suspension at every turn, the amount that at every turn adds Bacillus licheniformis suspension is 10 with the concentration of initiate Bacillus licheniformis in fermention medium 12Cfu/mL is as the criterion, and it is 1 * 10 that fermentation culture 48h namely makes concentration 12The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the intestinal bacteria suspension of step (1) preparation and the Bdellovibrio BDM01 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 1 * 10 12The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the Aeromonas of Bdellovibrio preparation B, Salmonellas, streptococcus aureus all have good lytic effect.Respectively with to the negative Aeromonas hydrophila of gram with to the example that is cracked into of the positive streptococcus equisimilis of gram (Streptococcus equinus, strain number: cvcc1925 derive from national veterinary microorganism DSMZ).Be equipped with 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, add the bacterial sediment that conventional cultural method obtains Aeromonas hydrophila and streptococcus equisimilis respectively, every kind of bacterium has two bottles.Regulate the cell concentration unanimity (10 of 4 bottles of damping fluids 10Cfu/mL).In two bottles of buffer systems that contain Aeromonas hydrophila, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, in two bottles of buffer systems that contain streptococcus equisimilis, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, 36h, 42h, these nine moment of 48h, by 10 -1～10 -10Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in Figure 9.As can be seen from Figure 9, compare with the Bdellovibrio preparation B that obtains with Escherichia coli fermentation, Bdellovibrio preparation A with the lichen bacillus ferments not only has stronger lytic effect to the negative Aeromonas hydrophila of gram, and also good than Bdellovibrio preparation B to the lytic effect of the positive streptococcus equisimilis of gram.In addition, the Bdellovibrio preparation A that is made by Bacillus licheniformis not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 10
Prepare Bdellovibrio preparation A and Bdellovibrio preparation B with Lactobacterium acidophilum (bacterium numbering: GIM1.208 derives from microbial strains preservation center, Guangdong Province) and intestinal bacteria for the host bacterium respectively, detailed process is as follows:
(1) preparation of Lactobacterium acidophilum
Lactobacterium acidophilum is inoculated in nutrient broth medium (peptone 10g, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2) in, place 32 ℃ of shaking tables to cultivate 24h, make it be in logarithmic phase, nutrient solution under 4 ℃ of conditions, the centrifugal 20min of 5000rpm, keep the precipitation abandoning supernatant, (concentration is 0.2mol/L, and pH7.5), obtaining concentration is 10 to add the potassium phosphate salt damping fluid in the precipitation 17The Lactobacterium acidophilum suspension of cfu/mL, it is standby to place 8 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 17The intestinal bacteria suspension of cfu/mL, it is standby to place 8 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.2mol/L, adds the intestinal bacteria suspension of step (1) preparation in pH7.5), and adjusting colibacillary concentration is 10 at the potassium phosphate salt damping fluid 15Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on August 7th, 2009 from the Bdellovibrio BDS02(of soil, deposit number is CCTCC NO:M209170) spot, then this nutrient solution is cultivated 60h at 30 ℃, again at 4 ℃, the centrifugal 20min of 6000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 15 ℃, the centrifugal 20min of 13000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.2mol/L, the potassium phosphate salt damping fluid of pH7.5, the concentration of adjusting the Bdellovibrio telotroch is 10 7Pfu/mL obtains Bdellovibrio BDS02 telotroch concentrated solution, and it is standby to place 6 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
Be the fermentor tank of packing in 7.2 the DNB liquid nutrient medium with the pH value, 121 ℃ of sterilization 20min obtain fermention medium; Add the Lactobacterium acidophilum suspension of step (1) preparation and the Bdellovibrio BDS02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the Lactobacterium acidophilum in the fermention medium is 10 10Cfu/mL, the Bdellovibrio initial concentration is 10pfu/mL, ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 30 ℃; Add the fermention medium pH value control during the fermentation of Lactobacterium acidophilum suspension and Bdellovibrio telotroch concentrated solution 7.5; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 20%; Add Lactobacterium acidophilum suspension in the culturing process twice, add 14h pitch time of Lactobacterium acidophilum suspension at every turn, the amount that at every turn adds Lactobacterium acidophilum suspension is 10 with the concentration of initiate Lactobacterium acidophilum in fermention medium 13Cfu/mL is as the criterion, and it is 1 * 10 that fermentation culture 42h namely makes concentration 8The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the intestinal bacteria suspension of step (1) preparation and the Bdellovibrio BDS02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 1 * 10 8The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the Aeromonas of Bdellovibrio preparation B, Salmonellas, streptococcus aureus all have lytic effect.Respectively with the example that is cracked into to streptococcus aureus and Salmonella choleraesuls.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, respectively add the bacterial sediment that conventional cultural method obtains streptococcus aureus and Salmonella choleraesuls respectively, 2 bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating 4 bottles of damping fluids 11Cfu/mL).In two bottles of buffer systems that contain streptococcus aureus, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, in two bottles of buffer systems that contain Salmonella choleraesuls, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, these eight moment of 36h, 42h, by 10 -1～10 -11Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in figure 10.As can be seen from Figure 10, compare with the Bdellovibrio preparation B with Escherichia coli fermentation, Bdellovibrio preparation A with the Lactobacterium acidophilum fermentation not only has stronger lytic effect to the negative Salmonella choleraesuls of gram, and also better than Bdellovibrio preparation B to the lytic effect of the positive streptococcus aureus of gram.In addition, the Bdellovibrio preparation A that is made by Lactobacterium acidophilum not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 11
Prepare Bdellovibrio preparation A and Bdellovibrio preparation B with lactobacterium casei (bacterium numbering: GIM1.159 derives from microbial strains preservation center, Guangdong Province) and Aeromonas hydrophila for the host bacterium respectively, detailed process is as follows:
(1) preparation of lactobacterium casei
Lactobacterium casei is inoculated in nutrient broth medium (peptone 10g, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2) in, place 30 ℃ of shaking tables to cultivate 18h, make it be in logarithmic phase, nutrient solution under 5 ℃ of conditions, the centrifugal 15min of 8000rpm, keep the precipitation abandoning supernatant, (concentration is 0.1mol/L, and pH7.4), obtaining concentration is 10 to add the sodium phosphate salt damping fluid in the precipitation 22The lactobacterium casei suspension of cfu/mL, it is standby to place 15 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 22The Aeromonas hydrophila suspension of cfu/mL, it is standby to place 15 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.1mol/L, adds the Aeromonas hydrophila suspension of step (1) preparation in pH7.4), and the concentration of adjusting Aeromonas hydrophila is 10 at the sodium phosphate salt damping fluid 15Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 13rd, 2008 from the Bdellovibrio BDF02(of fresh water, deposit number is CCTCC NO:M208009) spot, then this nutrient solution is cultivated 54h at 30 ℃, again at 5 ℃, the centrifugal 20min of 7000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 5 ℃, the centrifugal 15min of 20000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.1mol/L, the sodium phosphate salt damping fluid of pH7.4, the concentration of adjusting the Bdellovibrio telotroch is 10 7Pfu/mL obtains Bdellovibrio BDF02 telotroch concentrated solution, and it is standby to place 2 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
With the distilled water fermentor tank of packing into, 121 ℃ of sterilization 20min obtain fermention medium; Add the lactobacterium casei suspension of step (1) preparation and the Bdellovibrio BDF02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the lactobacterium casei in the fermention medium is 10 14Cfu/mL, Bdellovibrio initial concentration are 10 3Pfu/mL ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 29 ℃; Add the fermention medium pH value control during the fermentation of lactobacterium casei suspension and Bdellovibrio telotroch concentrated solution 7.2; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 30%; Add lactobacterium casei suspension in the culturing process twice, add 15h pitch time of lactobacterium casei suspension at every turn, the amount that at every turn adds lactobacterium casei suspension is 10 with the concentration of initiate lactobacterium casei in fermention medium 14Cfu/mL is as the criterion, and it is 1 * 10 that fermentation culture 45h namely makes concentration 9The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the Aeromonas hydrophila suspension of step (1) preparation and the Bdellovibrio BDF02 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 1 * 10 9The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the intestinal bacteria of Bdellovibrio preparation B, Salmonellas, streptococcus equisimilis have good lytic effect.Respectively with to streptococcus equisimilis and the colibacillary example that is cracked into.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, respectively add conventional cultural method respectively and obtain streptococcus equisimilis and colibacillary bacterial sediment, 2 bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating 4 bottles of damping fluids 12Cfu/mL).In two bottles of buffer systems that contain streptococcus equisimilis, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, contain in the colibacillary buffer system at two bottles, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, these eight moment of 36h, 42h, by 10 -1～10 -12Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in figure 11.As can be seen from Figure 11, compare with the Bdellovibrio preparation B with the Aeromonas hydrophila fermentation, Bdellovibrio preparation A with the lactobacterium casei fermentation not only has stronger lytic effect to the negative intestinal bacteria of gram, and also better than Bdellovibrio preparation B to the lytic effect of the positive streptococcus equisimilis of gram.In addition, the Bdellovibrio preparation A that the Cheesecake Bacterium lacticum makes not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 12
Prepare Bdellovibrio preparation A and Bdellovibrio preparation B with lactobacillus lactis (bacterium numbering: ATCC12315 derives from American Type Culture Collection) and streptococcus suis II for the host bacterium respectively, detailed process is as follows:
(1) preparation of lactobacillus lactis suspension
Lactobacillus lactis is inoculated in nutrient broth medium (peptone 10g, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2) in, place 37 ℃ of shaking tables to cultivate 18h, make it be in logarithmic phase, nutrient solution under 4 ℃ of conditions, the centrifugal 20min of 6000rpm, keep the precipitation abandoning supernatant, (concentration is 0.2mol/L, and pH7.5), obtaining concentration is 10 to add the potassium phosphate salt damping fluid in the precipitation 20The lactobacillus lactis suspension of cfu/mL, it is standby to place 4 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 20The streptococcus suis II suspension of cfu/mL, it is standby to place 4 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.2mol/L, adds the streptococcus suis II suspension of step (1) preparation in pH7.5), and the concentration of adjusting streptococcus suis II is 10 at the potassium phosphate salt damping fluid 15Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs.) the Bdellovibrio BDS01(of the separation soil that cultivates is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on August 7th, 2009, deposit number is CCTCC NO:M209169) spot, then this nutrient solution is cultivated 20h at 40 ℃, again at 4 ℃, the centrifugal 20min of 6000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 4 ℃, the centrifugal 40min of 12000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.2mol/L, the potassium phosphate salt damping fluid of pH7.5, the concentration of adjusting the Bdellovibrio telotroch is 10 8Pfu/mL obtains Bdellovibrio BDS01 telotroch concentrated solution, and it is standby to place 4 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
Add sodium-chlor in the pH value is 7.2 DNB liquid nutrient medium, the adding quality of sodium-chlor is 0.5% of DNB liquid nutrient medium volume, the fermentor tank of packing into, and 121 ℃ of sterilization 20min obtain fermention medium; Add the lactobacillus lactis suspension of step (1) preparation and the Bdellovibrio BDS01 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the lactobacillus lactis in the fermention medium is 10 13Cfu/mL, Bdellovibrio initial concentration are 10 2Pfu/mL ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 30 ℃; Add the fermention medium pH value control during the fermentation of lactobacillus lactis suspension and Bdellovibrio telotroch concentrated solution 7.2～7.6; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 23%; Add lactobacillus lactis suspension in the culturing process 1 time, add 18h pitch time of lactobacillus lactis suspension at every turn, the amount that at every turn adds lactobacillus lactis suspension is 10 with the concentration of initiate lactobacillus lactis in fermention medium 13Cfu/mL is as the criterion, and it is 5 * 10 that fermentation culture 42h namely makes concentration 9The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the streptococcus suis II suspension of step (1) preparation and the Bdellovibrio BDS01 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 5 * 10 9The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the Aeromonas of Bdellovibrio preparation B, Salmonellas, staphylococcus epidermidis all have lytic effect.Respectively with the example that is cracked into to Aeromonas hydrophila and staphylococcus epidermidis.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, respectively add the bacterial sediment that conventional cultural method obtains Aeromonas hydrophila and staphylococcus epidermidis respectively, 2 bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating 4 bottles of damping fluids 11Cfu/mL).In two bottles of buffer systems that contain Aeromonas hydrophila, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, in two bottles of buffer systems that contain staphylococcus epidermidis, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, 36h, 42h, these nine moment of 48h, by 10 -1～10 -11Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in figure 12.As can be seen from Figure 12, compare with the Bdellovibrio preparation B with the streptococcus suis II fermentation, Bdellovibrio preparation A with the lactobacillus lactis fermentation not only has stronger lytic effect to the negative Aeromonas hydrophila of gram, and also better than Bdellovibrio preparation B to the lytic effect of the positive staphylococcus epidermidis of gram.In addition, the Bdellovibrio preparation A that is made by lactobacillus lactis not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 13
Prepare Bdellovibrio preparation A and Bdellovibrio preparation B with plant lactobacillus (bacterium numbering: GIM1.140 derives from microbial strains preservation center, Guangdong Province) and Salmonella choleraesuls for the host bacterium respectively, detailed process is as follows:
(1) preparation of plant lactobacillus
Plant lactobacillus is inoculated in nutrient broth medium (peptone 10g, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2) in, place 30 ℃ of shaking tables to cultivate 24h, make it be in logarithmic phase, nutrient solution under 8 ℃ of conditions, the centrifugal 20min of 6000rpm, keep the precipitation abandoning supernatant, (concentration is 0.2mol/L, and pH7.4), obtaining concentration is 10 to add the sodium phosphate salt damping fluid in the precipitation 20The plant lactobacillus suspension of cfu/mL, it is standby to place 4 ℃ of refrigerators to preserve then;
The same method, the concentration of preparation are 10 20Cfu/mL Salmonella choleraesuls suspension, it is standby to place 4 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.2mol/L, adds the Salmonella choleraesuls suspension of step (1) preparation in pH7.4), and the concentration of adjusting Salmonella choleraesuls is 10 at the sodium phosphate salt damping fluid 12Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 13rd, 2008 from the Bdellovibrio BDF01(of fresh water, deposit number is CCTCC NO:M208008) spot, then this nutrient solution is cultivated 20h at 30 ℃, again at 2 ℃, the centrifugal 15min of 8000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 4 ℃, the centrifugal 22min of 15000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.2mol/L, the sodium phosphate salt damping fluid of pH7.4, the concentration of adjusting the Bdellovibrio telotroch is 10 6Pfu/mL obtains Bdellovibrio BDF01 telotroch concentrated solution, and it is standby to place 15 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
The sodium phosphate salt damping fluid (concentration is 0.2mol/L, pH7.6), the fermentor tank of packing into, 121 ℃ the sterilization 20min, obtain fermention medium; Add the plant lactobacillus suspension of step (1) preparation and the Bdellovibrio BDF01 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the plant lactobacillus in the fermention medium is 10 10Cfu/mL, Bdellovibrio initial concentration are 10 2Pfu/mL ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 30 ℃; Add the fermention medium pH value control during the fermentation of plant lactobacillus suspension and Bdellovibrio telotroch concentrated solution 7.4; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 30%; Add plant lactobacillus suspension in the culturing process twice, add 18h pitch time of plant lactobacillus suspension at every turn, the amount that at every turn adds plant lactobacillus suspension is 10 with the concentration of initiate plant lactobacillus in fermention medium 10Cfu/mL is as the criterion, and it is 5 * 10 that fermentation culture 48h namely makes concentration 10The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the Salmonella choleraesuls suspension of step (1) preparation and the Bdellovibrio BDF01 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 5 * 10 10The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the intestinal bacteria of Bdellovibrio preparation B, Salmonellas, streptococcus agalactiae all have lytic effect.Respectively with the example that is cracked into to streptococcus agalactiae and Salmonella typhimurium.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, respectively add the bacterial sediment that conventional cultural method obtains streptococcus agalactiae and Salmonella typhimurium respectively, two bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating 4 bottles of damping fluids 10Cfu/mL).In two bottles of buffer systems that contain streptococcus agalactiae, add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, in two bottles of buffer systems that contain Salmonella typhimurium, add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, these 98 moment of 36h, 42h, by 10 -1～10 -10Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in figure 13.As can be seen from Figure 13, compare with the Bdellovibrio preparation B with the Salmonella choleraesuls fermentation, Bdellovibrio preparation A with the plant lactobacillus fermentation not only has stronger lytic effect to the negative Salmonella typhimurium of gram, and also better than Bdellovibrio preparation B to the lytic effect of the positive streptococcus agalactiae of gram.In addition, the Bdellovibrio preparation A that is made by plant lactobacillus not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Embodiment 14
Prepare Bdellovibrio preparation A and Bdellovibrio preparation B with Pediococcus pentosaceus (bacterium numbering: CGMCC1.2695 derives from China Committee for Culture Collection of Microorganisms common micro-organisms center) and intestinal bacteria for the host bacterium respectively, detailed process is as follows:
(1) preparation of Pediococcus pentosaceus
Pediococcus pentosaceus is inoculated in nutrient broth medium (peptone 10g, extractum carnis powder 3g, sodium-chlor 5g, pH7.4 ± 0.2) in, place 32 ℃ of shaking tables to cultivate 24h, make it be in logarithmic phase, nutrient solution under 4 ℃ of conditions, the centrifugal 20min of 5000rpm, keep the precipitation abandoning supernatant, (concentration is 0.2mol/L, and pH7.5), obtaining concentration is 10 to add the potassium phosphate salt damping fluid in the precipitation 18The Pediococcus pentosaceus suspension of cfu/mL, it is standby to place 8 ℃ of refrigerators to preserve then;
The same method, preparation concentration is 10 18The intestinal bacteria suspension of cfu/mL, it is standby to place 8 ℃ of refrigerators to preserve;
(2) preparation of Bdellovibrio telotroch concentrated solution:
(concentration is 0.2mol/L, adds the intestinal bacteria suspension of step (1) preparation in pH7.5), and adjusting colibacillary concentration is 10 at the potassium phosphate salt damping fluid 15Cfu/mL, inserting with ordinary method again (is 200910042274.6 according to application number, name is called the patent application of " a kind of Bdellovibrio bacteriovorus bacterial strain and application thereof that prevents and treats mastadenitis of cow ", be specially the double-layer plate method that adopts Stolp and Petzhold: get 0.5mL Bdellovibrio telotroch concentrated solution and 0.5mL intestinal bacteria suspension and mix, this mixed solution again with DNB upper strata substratum (the distilled water 500mL of 3-3.5mL50 ° of C, pH7.2, agar powder 3.5g) mixes, be poured into flat board (the nutrient broth 0.8g of DNB lower floor, tyrosine acid hydrolysis thing 0.5g, yeast extract 0.1g, distilled water 1000mL, pH7.2, agar powder 17g) in and pave.Place 28 ° of C constant incubators to cultivate double-layer plate, wait to contain on the double-deck agar plate of host bacterium and plaque occurs) cultivate the separation of coming out and be preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on January 14th, 2008 from the Bdellovibrio BDJ01(of seawater, deposit number is CCTCC NO:M208011) spot, then this nutrient solution is cultivated 60h at 30 ℃, again at 8 ℃, the centrifugal 30min of 5000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 4 ℃, the centrifugal 25min of 16000rpm, keep the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, in precipitation, add 0.2mol/L, the potassium phosphate salt damping fluid of pH7.5, the concentration of adjusting the Bdellovibrio telotroch is 10 9Pfu/mL obtains Bdellovibrio BDJ01 telotroch concentrated solution, and it is standby to place 4 ℃ of refrigerators to preserve;
(3) preparation of Bdellovibrio preparation
Add sodium-chlor in the pH value is 7.2 DNB liquid nutrient medium, the adding quality of sodium-chlor is 2.5% of DNB liquid nutrient medium volume, the fermentor tank of packing into, and 121 ℃ of sterilization 20min obtain fermention medium; Add the Pediococcus pentosaceus suspension of step (1) preparation and the Bdellovibrio BDJ01 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, the initial concentration of the Pediococcus pentosaceus in the fermention medium is 10 13Cfu/mL, Bdellovibrio initial concentration are 10 3Pfu/mL ferments; Each parameter condition of fermenting is as follows: temperature is controlled at 30 ℃; Add the fermention medium pH value control during the fermentation of Pediococcus pentosaceus suspension and Bdellovibrio telotroch concentrated solution 7.6; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 25%; Add Pediococcus pentosaceus suspension in the culturing process 3 times, add 12h pitch time of Pediococcus pentosaceus suspension at every turn, the amount that at every turn adds Pediococcus pentosaceus suspension is 10 with the concentration of initiate Pediococcus pentosaceus in fermention medium 13Cfu/mL is as the criterion, and it is 1 * 10 that fermentation culture 48h namely makes concentration 9The Bdellovibrio preparation A of pfu/mL.
Same quadrat method adds the intestinal bacteria suspension of step (1) preparation and the Bdellovibrio BDJ01 telotroch concentrated solution of step (2) preparation in 30 ℃ fermention medium, making concentration is 1 * 10 9The Bdellovibrio preparation B of pfu/mL.
Pathogenic bacterium such as this Bdellovibrio preparation A and the streptococcus uberis of Bdellovibrio preparation B, Salmonellas, streptococcus suis II all have lytic effect.Respectively with the example that is cracked into to streptococcus uberis and streptococcus suis II.Be equipped with in 4 bottles of potassium-sodium phosphates salt buffers that 50mL respectively is housed, respectively add the bacterial sediment that conventional cultural method obtains streptococcus uberis and streptococcus suis II respectively, 2 bottles of every kind of bacterium, the cell concentration unanimity (10 of regulating 4 bottles of damping fluids 10Cfu/mL).In two bottles of buffer systems that contain streptococcus uberis, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively; Equally, in two bottles of buffer systems that contain streptococcus suis II, respectively add Bdellovibrio preparation A1mL and Bdellovibrio preparation B1mL respectively, in 30 ℃, cultivate on the shaking table of 200rpm.Take a sample respectively in 0h, 6h, 12h, 18h, 24h, 30h, these eight moment of 36h, 42h, by 10 -1～10 -10Extension rate dilute, the diluent of respectively getting 100 μ L again carries out the flat board coating respectively, cultivate 24h under 30 ℃ of conditions after, calculate colony number.Experimental result as shown in figure 14.As can be seen from Figure 14, compare with the Bdellovibrio preparation B with Escherichia coli fermentation, Bdellovibrio preparation A with the Pediococcus pentosaceus fermentation not only has stronger lytic effect to the negative streptococcus suis II of gram, and also better than Bdellovibrio preparation B to the lytic effect of the positive streptococcus uberis of gram.In addition, the Bdellovibrio preparation A that is made by Pediococcus pentosaceus not only can directly make preparation, also can make simple telotroch, leech liposome preparation by further centrifugal.
Above-described embodiment is preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (5)

1. the fermentation process of a Bdellovibrio preparation is characterized in that may further comprise the steps:
(1) preparation of host bacteria suspension:
The host bacterium is cultured to logarithmic phase, collects thalline, adjust concentration with phosphate buffered saline buffer, obtaining concentration is 10 17～10 22The host bacterium suspension of cfu/mL places 2～15 ℃ of preservations standby then; Described host bacterium is Bacillus licheniformis (Bacillus licheniformis) GIM1.182;
(2) preparation of Bdellovibrio telotroch concentrated solution:
The host bacterium suspension that adds step (1) preparation in phosphate buffered saline buffer, the concentration of adjusting the host bacterium is 10 10～10 15Cfu/mL, insert the Bdellovibrio spot again, then this nutrient solution is cultivated 20～60h at 20～40 ℃, again at 2～15 ℃, the centrifugal 15～35min of 5000～8000rpm, keep supernatant liquor and discard precipitation, then with supernatant liquor at 2～15 ℃, the centrifugal 15～40min of 12000～20000rpm keeps the precipitation abandoning supernatant, be precipitated as the Bdellovibrio telotroch, the concentration that adds phosphate buffered saline buffer adjustment Bdellovibrio telotroch in precipitation is 10 6～10 9Pfu/mL obtains Bdellovibrio telotroch concentrated solution, places 2～15 ℃ of preservations standby; Described Bdellovibrio is BDM01, and BDM01 is preserved in Chinese typical culture collection center in the Chinese Wuhan City Wuhan University on April 28th, 2008, and deposit number is CCTCC NO:M208066;
(3) preparation of Bdellovibrio preparation:
With the solvent sterilization, obtain fermention medium; Add the host bacterium suspension of step (1) preparation and the Bdellovibrio telotroch concentrated solution of step (2) preparation in fermention medium, making host bacterium initial concentration is 10 10～10 15Cfu/mL, Bdellovibrio telotroch initial concentration is 10 1～10 3Pfu/mL ferments; Leavening temperature control is at 28～30 ℃, and the pH value is controlled 7.2～7.6; The interlock of mixing speed and dissolved oxygen is set, makes dissolved oxygen level control 20%～30%; Add host bacterium suspension in the fermenting process 1～3 time, add 12～18h pitch time of host bacterium suspension at every turn, the amount that at every turn adds host bacterium suspension is 10 with the concentration of initiate host bacterium in fermention medium 10～10 15Cfu/mL is as the criterion; Fermentation culture 36～48h namely makes the Bdellovibrio preparation; Described solvent is DNB liquid nutrient medium, distilled water or phosphate buffered saline buffer.
2. the fermentation process of a kind of Bdellovibrio preparation according to claim 1, it is characterized in that: the mode of the described collection thalline of step (1) is for to obtain by centrifugation, and centrifugal condition is 2～15 ℃, the centrifugal 15～35min of 5000～8000rpm; The concentration of described host bacterium suspension is 10 17～10 22Cfu/mL; The concentration of step (1)～(3) each described phosphate buffered saline buffer is 0.1～0.3mol/L, and pH is 7.2～7.6; The concentration of the described Bdellovibrio telotroch of step (2) concentrated solution is 10 8～10 12Pfu/mL.
3. the fermentation process of a kind of Bdellovibrio preparation according to claim 1 is characterized in that: the condition of the described sterilization of step (3) is 121 ℃ of sterilization 20min; The concentration of described Bdellovibrio preparation is 10 8～10 12Pfu/mL; Described DNB liquid nutrient medium is that nutrient broth 0.8g, caseinic acid hydrolyzate 0.5g and yeast extract 0.1g are dissolved in the 1000mL distilled water, regulates pH value to 7.2～7.6.
4. a Bdellovibrio preparation is prepared by each described method of claim 1～3.
5. the application of Bdellovibrio preparation according to claim 4 in preparation control Aeromonas hydrophila and streptococcus equisimilis medicine.
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