CN103621796A - Bacillus amyloliquefaciens Sh1 microcapsule and preparing method therefor - Google Patents
Bacillus amyloliquefaciens Sh1 microcapsule and preparing method therefor Download PDFInfo
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Abstract
The invention discloses a bacillus amyloliquefaciens Sh1 microcapsule. A microcapsule particle is approximately ball-shaped, depressions exist on the surface of the microcapsule particle, but apertures and cracks do not exist on the surface of the microcapsule particle. The particle size of the microcapsule particle is 8-12 [mu]m, the particles are evenly distributed, and the logarithm value of effective bacterial amount is 6.64-9.28. The invention also provides a preparing method for the microcapsule, and the method comprises following steps: (1) uniformly mixing the bacillus amyloliquefaciens Sh1 solution, emulsion, suspension or pulp with aseptic gelatin solution; and (2) spray drying the mixed product obtained by step (1), and finally preparing microcapsule powder. The method is characterized in that the concentration of the aseptic gelatin utilized in the step (1) is 2-6%.
Description
Technical field
The invention belongs to aquatic products microorganism fodder additive technical field, relate in particular to a kind of bacillus amyloliquefaciens Sh1 microcapsules and preparation method thereof.Open in the Chinese invention patent that this bacillus amyloliquefaciens Sh1 has been 201010264180.6 at application number, application Ren Wei Shanghai Ocean University, name are called a kind of Saprolegnia antagonist and application thereof, corresponding biological preservation information is: CCTCC No:M20101292010.06.02).
Background technology
In recent years, the fast development of intensive aquaculture industry causes excessively abusing as the antibiotic of aquatic animal disease therapeutic agent and growth promoter, makes Safety of Aquatic Products be subject to increasingly serious challenge, and has caused a series of environment, health and social concern.At present, the developed countries such as Europe, the U.S., Japan explicit order forbid antibiotic as feed addictive, and are finding energetically antibiotic substitute.Therefore, culture fishery in the urgent need to can meet nuisanceless requirement can make again aquatic livestock fast, the novel fodder additive of healthy growth.Numerous research shows, probio is as the feed addictive aquiculture animal of feeding, can effectively control propagation, the effect of promotion growth of animal of aquatic pathogenic bacteria, there will not be drug resistance simultaneously, there is not the side effects such as hazard residue or pollution, be expected to become substitute antibiotics, control one of the most effective instrument of Animal diseases yet.Wherein prebiotic property bacillus has the merits such as strong stress resistance, storage endurance, application conditions be overcritical with it becomes a kind of probio being most widely used at present, by U.S. FDA, the Ministry of Agriculture, is listed in the bacterial classification catalogue that can be directly used in feed addictive.Yet the problem such as probiotic feed additive ubiquity product content is low, product stability is poor, has greatly hindered the sustainable health development of additive for microbe feedstuff industry.
Spray drying process be with single operation by solution, emulsion, suspension or slurry through atomizer effect, be sprayed into very trickle droplet, and rely on drying medium (hot-air, cold air, flue gas or inert gas) evenly to mix with droplet, carry out heat exchange and matter exchange, make solvent gasification or fused mass is solidified, finally be processed into a kind of seasoning of powdery dried product, its operating cost is low, production efficiency is high, production process is simple, dispersiveness and the dissolubility of product are better, are one of production methods of generally adopting of food or food additives industry.For example, Cheng Yanwei etc. utilize spray drying technology to produce lactobacillus acidophilus bacterium powder, for producing the stable of bubble green pepper, provide sound assurance with shortening fermentation time, the spray-dired method of the employings such as Qi Wei has been prepared bacillus coagulans microcapsules, has greatly improved the preservation term of bacillus coagulans.Yet, do not have so far people by spray drying technology for the production of aquatic products microorganism fodder additive.
Summary of the invention
The deficiency existing for overcoming prior art, technical problem to be solved by this invention is to provide a kind of Saprolegnia antagonist microcapsules, this Saprolegnia antagonist is bacillus amyloliquefaciens Sh1(deposit number: CCTCC No.M2010129), i.e. and bacillus amyloliquefaciens Sh1 microcapsules.
According to embodiments of the invention, bacillus amyloliquefaciens Sh1 microcapsules of the present invention are white micropowders, and microcapsule granule is roughly spherical in shape, and there is depression on surface, but there is no hole and crackle, and microcapsule granule particle size is 8 ~ 12 μ m, and it is substantially even to distribute; Its effective bacterial content logarithm value is 6.64-9.28, and more preferably, effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules of the present invention is 1.91 * 109cfu/g.
According to the preferred embodiment of the invention, the microcapsule granule mean size of bacillus amyloliquefaciens Sh1 microcapsules of the present invention is 9.22 μ m.
The present invention provides a kind of method of preparing bacillus amyloliquefaciens Sh1 microcapsules by spray drying process on the other hand, and it comprises the steps:
1) bacillus amyloliquefaciens Sh1 solution, emulsion, suspension or slurry are evenly mixed with sterile gelatin solution;
2) step (1) mixture that obtains is sprayed and be dried, be finally prepared into microcapsules;
It is characterized in that, the concentration of sterile gelatin described in described step 1) is 2-6%.
Gelatin is a kind of hydrophilic macromolecule colloid; wide material sources; cheap; emulsibility, filming performance are good, and physicochemical property is stable, and are difficult for and grease quasi-molecule reacts; therefore often can be used as microcapsule wall material; gelatin is a kind of good spraying dry heat protective agent, and the gelatin solution concentration that the spray drying process that the present invention discloses is prepared bacillus amyloliquefaciens Sh1 microcapsules is 2-6%, is preferably 3%.This gelatin solution concentration maximizes effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules.
EAT and charging rate are the key parameters that affects bacillus amyloliquefaciens Sh1 drying process with atomizing quality, charging rate and EAT all can exert an influence to effective effect bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules, and the former impact is greater than the latter.Spray drying process of the present invention is prepared the method for bacillus amyloliquefaciens Sh1 microcapsules, and in its spraying drying steps, the suitableeest EAT is 110 ℃-170 ℃, most preferably is 155 ℃; The suitableeest charging rate is 6-14ml/min, most preferably is 8ml/min.Under these conditions, the quality of bacillus amyloliquefaciens Sh1 microcapsules is high, and especially effectively bacteria containing amount is high.
The size of air mass flow determines the fluidized state of charging rate and wall material, because of dry mass and the inhomogeneity important parameter of microcapsule granule but impact is sprayed.Therefore, in drying process with atomizing, determine that suitable air mass flow can either prevent that wall material is adsorbed on column casing wall too much, can guarantee again the abundant fluidisation of wall material.Air mass flow has obvious impact to the wall thickness size of microcapsule granule.Air mass flow in the spraying drying steps of bacillus amyloliquefaciens Sh1 microcapsule preparation method of the present invention is 600-800L/h, and the particle shape while most preferably being 700L/h is homogeneous relatively.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail:
Fig. 1 is block diagram, has shown the impact of gelatin solution concentration of the present invention on the effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules;
Fig. 2 is block diagram, has shown the impact of EAT on the effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules;
Fig. 3 is block diagram, has shown the impact of charging rate on the effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules;
Fig. 4 is block diagram, has shown the impact of air mass flow on the effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules;
Fig. 5 is bacillus amyloliquefaciens Sh1 microcapsules of the present invention forms under the microscope.
The specific embodiment
The block diagram of Fig. 1, ordinate is bacterial content logarithm value, abscissa is gelatin solution concentration.From this block diagram, can find out, when gelatin solution concentration is 3%, effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules is the highest.When gelatin solution concentration is 2%, the logarithm value of effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules has reduced 6.92%(P<0.05 while being 3% than gelatin solution concentration); When gelatin solution concentration is respectively 4%, 5% and 6%, effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules reduces gradually with the increase of gelatin solution concentration, has also reduced respectively 2.16%(P<0.05 when the logarithm value of its effective bacteria containing amount is 3% than gelatin solution concentration), 5.11%(P<0.05) and 8.74%(P<0.05).
The block diagram of Fig. 2, ordinate is bacterial content logarithm value, abscissa is EAT.From this block diagram, can find out, when EAT is 150 ℃, effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules is the highest.When EAT is 110 ℃, 120 ℃, 130 ℃ and 140 ℃, effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules increases gradually with the rising of EAT, the 89.37%(P<0.05 when logarithm value of its effective bacteria containing amount is equivalent to respectively EAT and is 150 ℃), 91.30%(P<0.05), 97.56%(P<0.05) and 98.78%(P>0.05); When EAT is 160 ℃ and 170 ℃, effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules reduces gradually with the rising of EAT, and the logarithm value of its effective bacteria containing amount has reduced respectively 4.87%(P<0.05 while being 150 ℃ than EAT) and 8.75%(P<0.05).
The block diagram of Fig. 3, ordinate is bacterial content logarithm value, abscissa is charging rate.From this block diagram, can find out, when charging rate is 10ml/min, effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules is the highest.When charging rate is 6ml/min and 8ml/min, the logarithm value of effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules has reduced respectively 16.39%(P<0.05 while being 10ml/min than charging rate) and 4.21%(P<0.05); When charging rate is 12ml/min and 14ml/min, when effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules is 10ml/min compared with charging rate, also reduced respectively 7.53%(P<0.05) and 14.06%(P<0.05).
The block diagram of Fig. 4, ordinate is bacterial content logarithm value, abscissa is air mass flow.From this block diagram, can find out, when air mass flow is 700L/h, effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules is the highest.When air mass flow is 600L/h and 650L/h, the logarithm value of effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules has reduced 17.83%(P<0.05 while being 700L/h than air mass flow) and 4.21%(P<0.05); When air mass flow is 750L/h and 800L/h, when the logarithm value of effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules is 700L/h than air mass flow, also reduced respectively 7.53%(P<0.05) and 32.45%(P<0.05).
The microcapsules that Fig. 5 has shown bacillus amyloliquefaciens Sh1 microcapsules mirror image under the microscope, the microcapsule granule of bacillus amyloliquefaciens Sh1 microcapsules is spherical in shape, and there is depression on surface, but there is no hole and crackle, particle size distribution is substantially even, and mean size is 9.22 μ m.
Materials and methods
Experiment material
Bacillus amyloliquefaciens Sh1, is good Saprolegnia antagonist, is preserved in Chinese Typical Representative culture collection center (deposit number: CCTCC No.M2010129); SPSS (0.85%); Gelatin, ordinary nutrient agar culture medium, nutrient broth, be all purchased from chemical reagent Co., Ltd of traditional Chinese medicines group (Shanghai), and above culture medium is all in 121 ℃ of sterilizing 20min; Small-sized spray drier, is purchased from Shanghai Shi Yuan bioengineering Co., Ltd.
Technical parameter
1, the maximum evaporation water yield: 1800ml/h; Water;
2, EAT: 30～250 ℃ ± 1 ℃;
3, leaving air temp: 30～120 ℃;
4, air blast dry air flow: the maximum 330m3/h of normal air flow 70m3/h(); Pressure 686Pa;
5, blower power: 0.1KW/220V;
6, electric heater for pipeline ability: 3.2KW;
7, EAT adds thermal control: Pt-100, Intelligent PID Control
8, air compressor: 0.25KW, maximum gas production 4.2m3/h, operating pressure 2～5bar;
9, spraying system: with standard 0.7mm bore two-fluid spray nozzle (internal mix), also can select the nozzle of other sizes;
10, average drying time: 1.0～1.5 seconds;
11, automatic block-dredging device: cleansing pin unimpeded dredging frequency is adjustable automatically, and cycle setting range is 0～60 second/time;
12, with product contact material: acidproof 316L stainless steel, 3.3 Pyrex;
13, size (W * D * H): 700 * 650 * 1100mm;
14, supply voltage: 220/230V, 50～60Hz;
15, complete machine rated power: 3.8KW;
16, weight: 58kg
Preparation process
1, prepare raw material: prepare bacillus amyloliquefaciens Sh1 suspension, sterile gelatin solution; 2, allotment: bacillus amyloliquefaciens Sh1 suspension mixes according to certain ratio with sterile gelatin solution; 3, homogeneous: the mixture that is about to bacillus amyloliquefaciens Sh1 suspension and sterile gelatin solution fully mixes, and inserts the feed pipe of spray dryer in 30 ℃, 100r/min on magnetic stirring apparatus; 4, spraying is dry: first open air compressor (the multiple grand dynamo-electric Co., Ltd in Shanghai produces), the pressure of compressor is transferred to 0.6 ~ 0.8MPa, when machine internal pressure to be compressed reaches this numerical value, stable gas pressure, open the switch of spray dryer, then spray-dired cleansing pin frequency, charging rate, EAT and air mass flow parameter are set respectively, wherein, the effect of cleansing pin is the fumarole that prevented fed material from being blocked, so need to regulate suitable cleansing pin frequency according to the different viscosityes of raw material; 5, collect microscapsule powder, collector is collected the dry microscapsule powder producing of spraying, and with under aseptic condition, microscapsule powder being taken out from collector; 6, detect, detect grain diameter, form and the bacteria containing amount of microcapsules.
The preparation of bacillus amyloliquefaciens Sh1 suspension
Bacillus amyloliquefaciens Sh1 is inoculated in aseptic nutrient broth, in 30 ℃, 150r/min shaking table shaken cultivation 24h, then by nutrient solution in 4 ℃, the centrifugal 20min of 4000r/min, with after SPSS washing 2 times, with SPSS, by bacillus amyloliquefaciens Sh1 suspension concentration adjustment, be 3.6 * 109cfu/mL, standby in 4 ℃ of Refrigerator stores.
Embodiment 1
Sterile working is got bacillus amyloliquefaciens Sh1 suspension 1mL and is added concentration to be respectively in 2%, 3%, 4%, 5%, 6% sterile gelatin solution, then on magnetic stirring apparatus, in 30 ℃, 100r/min, fully mix, and it is dry to spray, respectively the bacillus amyloliquefaciens Sh1 microcapsules of preparing under different gelatin solution concentration are carried out the mensuration of effective bacteria containing amount under the conditions such as 130 ℃ of EATs, charging rate 10ml/min, air mass flow 700L/h, cleansing pin frequency 10s.
It is in 3% sterile gelatin solution that the suspension 1mL that bacillus amyloliquefaciens Sh1 is got in sterile working adds concentration, then on magnetic stirring apparatus, in 30 ℃, 100r/min, fully mix, and at EAT, be respectively and under the conditions such as 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃ and charging rate 10ml/min, air mass flow 700L/h, cleansing pin frequency 10s, spray dryly, respectively the bacillus amyloliquefaciens Sh1 microcapsules of preparing under different EATs are carried out the mensuration of effective bacteria containing amount.
It is in 3% sterile gelatin solution that the suspension 1mL that bacillus amyloliquefaciens Sh1 is got in sterile working adds concentration, then on magnetic stirring apparatus, in 30 ℃, 100r/min, fully mix, and in charging rate, be respectively 6,8,10,12, spray under the condition such as 14ml/min and 150 ℃ of EATs, air mass flow 700L/h, cleansing pin frequency 10s dryly, respectively the bacillus amyloliquefaciens Sh1 microcapsules of preparing under different feeds speed are carried out the mensuration of effective bacteria containing amount.
Embodiment 4
It is in 3% sterile gelatin solution that the suspension 1mL that bacillus amyloliquefaciens Sh1 is got in sterile working adds concentration, then on magnetic stirring apparatus, in 30 ℃, 100r/min, fully mix, and in air mass flow, be respectively 600,650,700,750, spray under the condition such as 800L/h and 150 ℃ of EATs, charging rate 10ml/min, cleansing pin frequency 10s dryly, respectively the bacillus amyloliquefaciens Sh1 microcapsules of preparing under different air mass flows are carried out the mensuration of effective bacteria containing amount.
The morphologic observation of bacillus amyloliquefaciens Sh1 microcapsules
With double faced adhesive tape, bacillus amyloliquefaciens Sh1 microcapsules are fixed on the sample stage of SEM, then in ion sputtering instrument, plate skim gold, finally by its form of sem observation and take pictures.
The assay method of the effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules
Sterile working is got bacillus amyloliquefaciens Sh1 microcapsules 0.05g in 9ml sterile distilled water, adopts dilution spread flat band method to carry out the mensuration (cfu/g) of effective bacteria containing amount after 37 ℃ of water-baths are dissolved.
Table 1 bacillus amyloliquefaciens Sh1 microcapsules drying process with atomizing orthogonal test (L9 (34)) factor level
The best of breed of bacillus amyloliquefaciens Sh1 microcapsules drying process with atomizing is that gelatin solution concentration is 3.0%, and EAT is 155 ℃, and charging rate is 8ml/min, and air mass flow is 700L/h.The effective bacteria containing amount of bacillus amyloliquefaciens Sh1 microcapsules under this optimum condition is 1.91 * 109cfu/g.Range analysis result (table 2) shows, four factors such as gelatin solution concentration, EAT, charging rate, air mass flow to the influence degree of drying process with atomizing are: gelatin solution concentration > charging rate > air mass flow > EAT.
Table 2 bacillus amyloliquefaciens Sh1 microcapsules drying process with atomizing determines that L9 (34) orthogonal experiment plan takes into account range analysis
But, those of ordinary skill in the art will be appreciated that, above embodiment is only for the present invention is described, and be not used as limitation of the invention, as long as within the scope of connotation of the present invention, to the variation of the above embodiment, modification, all will drop within the scope of claims of the present invention.
Claims (7)
1. bacillus amyloliquefaciens Sh1 microcapsules, this microcapsule granule is roughly spherical in shape, and there is depression on surface, but there is no hole and crackle; This microcapsule granule particle size is 8 ~ 12 μ m, and it is substantially even to distribute, and the logarithm value of its effective bacteria containing amount is 6.64-9.28.
2. bacillus amyloliquefaciens Sh1 microcapsules according to claim 1, wherein, the described microcapsules micropowders that is white in color.
3. bacillus amyloliquefaciens Sh1 microcapsules according to claim 1 and 2, wherein, described effective bacteria containing amount is 1.91 * 109cfu/g.
4. bacillus amyloliquefaciens Sh1 microcapsules according to claim 1 and 2, wherein, described grain diameter mean size is 9.22 μ m.
5. a method of preparing the bacillus amyloliquefaciens Sh1 microcapsules described in claim 1-4 any one, it comprises the steps:
1) bacillus amyloliquefaciens Sh1 solution, emulsion, suspension or slurry are evenly mixed with gelatin solution;
2) step (1) mixture that obtains is sprayed and be dried, be finally prepared into microcapsules; It is characterized in that, the concentration of gelatin described in described step 1) is 2-6%.
6. method according to claim 5, is characterized in that: the concentration of described gelatin is 3%.
7. method according to claim 4, is characterized in that: in described spraying drying steps, EAT is 110 ℃-170 ℃.
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| CN105062924A (en) * | 2015-08-23 | 2015-11-18 | 黑龙江省兽医科学研究所 | Pig-origin bacillus amyloliquefaciens spray drying technology |
| CN105309481A (en) * | 2014-07-29 | 2016-02-10 | 上海绿奥生物科技有限公司 | Preparation used for controlling vibrio number in water, and preparation method and application method thereof |
| CN110419716A (en) * | 2019-08-07 | 2019-11-08 | 河北科技大学 | A kind of Brevibacillus laterosporus antibacterial peptide microcapsule preparation method |
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Application publication date: 20140312 |