CN104073453A - Bacillus amyloliquefaciens and application thereof in control over geosmin smell in white spirit - Google Patents
Bacillus amyloliquefaciens and application thereof in control over geosmin smell in white spirit Download PDFInfo
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Abstract
The invention discloses a novel bacillus amyloliquefaciens, wherein a bacillus amyloliquefaciens is separated from high-temperature white spirit brewing yeast, and collected in the China Centre for Type Culture Collection (CCTCC) on August 12, 2013, and the collection number is CCTCC NO: M2013368; and the generation of geosmin smell in white spirit can be controlled by adding a certain amount of bacillus amyloliquefaciens during the white spirit brewing process. The strain is capable of synthesising active substances such as antimicrobial lipopeptides, suppressing the growth of geosmin-generating streptomycete and the synthesis of geosmin during the white spirit brewing process, and fundamentally controlling the geosmin smell in white spirits of a highly flavoured type, a faint flavour type, a soy sauce flavour type and the like.
Description
Technical field
The invention belongs to food microorganisms technical field, be specifically related to the method that a strain suppresses the separation screening of the bacillus amyloliquefaciens of earthy in white wine and controls earthy in white wine.
Background technology
White wine is the distinctive a kind of liquor of China, and firmly gets human consumer and like.Unique is open how strains solid fermented, and solid state distillation pattern is given the fragrance of white wine uniqueness.Earthy in white wine is had a greatly reduced quality the fragrance of white wine and quality, and high-grade-goods rate reduces, and therefore liquor-making enterprises suffers the tremendous economic loss that reaches more than one hundred million units every year.
Existing technique means including physical adsorption, although can remove to a certain extent the earthy in Daqu, but not only time and effort consuming cost is high for this method, and can non-specifically adsorb useful aroma component, fragrance and quality to white wine are brought negative impact simultaneously.Therefore this method has significant deficiency and is difficult to large-scale application.
There are some researches show, the chemistry source that native smelly element is earthy in white wine, the streptomycete in wine brewing Daqu is the main generation bacterium of native smelly element.Should be the basic skills of eradicating earthy in white wine by producing the streptomycete of native smelly element in certain means control Daqu.Remove the streptomycete in Daqu and then prevent that the method that earthy produces can not be applied to actual production process by adding chemosynthesis class microbiotic.This is to cause the great risk in food safety on the one hand because add microbiotic, and the useful product wine that microbiotic also can destroy in Daqu on the other hand produces micro-ecologic structure of fragrant functional microorganism, and then affects fragrance and the quality of white wine.Thereby, not yet there is a kind of earthy that can remove in white wine production at present, can retain again the useful aroma component in white wine, maintain the method for micro-ecologic structure of beneficial functions product wine aroma-producing microbe in Daqu.
Derive from many genus bacillus of the natural surroundingses such as soil, plant leaf and fruit surface, for example subtilis (B.subtilis), bacillus amyloliquefaciens (B.amyloliquefaciens), Bacillus licheniformis (B.licheniformis) and bacillus pumilus (B.pumilus), can produce serial antibacterial lipopeptid, there is the effect that suppresses various plants pathogenic micro-organism and mankind's pathogenic micro-organism.The lipopeptid that many investigators produce genus bacillus has produced keen interest, comprises the surface active function that it is outstanding, the feature of biological control and microbiotic curative effect aspect, and at the pharmacodynamic feature of antithrombotic, anti-tumor aspect.We brewage from high temperature the bacillus amyloliquefaciens B.amyloliquefaciens BA-1 that has separated product antibacterial lipopeptid Daqu first, find that it can effectively suppress the soil growth of smelly plain streptomycete of the product taking Streptomyces albus as representative and the formation of native smelly element in brewed spirit process, can effectively suppress the earthy in white wine.
Summary of the invention
For the problem of existing technological difficulties and existence, the bacillus amyloliquefaciens that the present invention separates from wine brewing high-temperature daqu, screening obtains a strain product antibacterial lipopeptid.Compare with the bacillus amyloliquefaciens separating in other environment, in high-temperature daqu, separating the bacillus amyloliquefaciens obtaining can be high temperature resistant: 45-60 DEG C, acidproof: pH3.0～5.0, resistance to ethanol: 0～12%, (koji top temperature reaches 50～60 DEG C to stress conditions that can be in brewed spirit process; Between fermented wine unstrained spirits pH3.5～4.0; Ethanol is up to 7% left and right) under survive and bring into play function.This bacterial strain has been carried out to a series of research to antagonistic ability and the smelly plain synthesis capability of inhibition soil of producing earthy streptomycete in brewed spirit.
The present invention's separation screening from high temperature wine brewing Daqu obtains a strain the smelly element of soil is produced bacterium and had the microorganism strains of fine antagonistic action, analyze and other morphological analysis through 16SrRNA, determine that this bacterial strain is bacillus amyloliquefaciens, and called after bacillus amyloliquefaciens (B.amyloliquefaciens) BA-1.This bacterial strain is delivered Chinese Typical Representative culture collection center (CCTCC) preservation on August 12nd, 2013, and deposit number is CCTCC NO:M2013368.Test shows this bacillus amyloliquefaciens separating, and can suppress to produce the growth of earthy streptomycete and suppress native smelly element and synthesize, and again the growth of the beneficial functions product wine aroma-producing microbe in Daqu is not affected simultaneously.
The bacillus amyloliquefaciens BA-1 that separation obtains, when producing the streptomycete mixed culture of native smelly element in brewed spirit process, can effectively suppress to produce the growth of the smelly plain streptomycete of soil, and the generation of the smelly element of soil is had to remarkable restraining effect.
From the culture of this bacillus amyloliquefaciens, obtain and there is antibacterial substance 1, be characterized as being antibacterial lipopeptid surfactin series material.There is the mass-spectrogram as shown in specification sheets, and have following structure:
Antibacterial lipopeptid surfactin and homologue can significantly suppress in brewed spirit process to produce the growth of the smelly plain streptomycete of soil, and the smelly element of soil synthetic had to significant restraining effect.
From the culture of this bacillus amyloliquefaciens, obtain and there is antibacterial substance 2, be characterized as being antibacterial lipopeptid bacillomycin D series material.There is the mass-spectrogram as shown in specification sheets, have following structure:
Antibacterial lipopeptid bacillomycin D and homologue can significantly suppress in brewed spirit process to produce the growth of the smelly plain streptomycete of soil, and the smelly element of soil synthetic had to significant restraining effect.
Bacillus amyloliquefaciens of the present invention is added into and brewages in Daqu with bacterium liquid or solid fungicide form in white wine is produced, and the thalline total amount of interpolation is 1% to 100% of Daqu Streptomyces total amount.
Concrete preparation process is as described below:
1. the separation screening of bacterium and qualification: isolate the bacterium with the smelly plain streptomycete of antagonism product soil from high-temperature daqu.The bacterium with remarkable anti-microbial activity detecting is carried out to 16S rRNA and identification of morphology.Determine that we separate what obtain is a bacillus amyloliquefaciens, the homology of 16S rRNA is 98%.
2. the separation and purification of antibacterial substance and effective constituent qualification: the bacillus amyloliquefaciens of above-mentioned acquisition is cultivated to secondary fermentation in 2 days organic solvent extraction (seeing embodiment 1) extraction antibacterial substance liquid for, liquid vacuum rotary evaporation concentrated (seeing embodiment 1) after extracting, and be dissolved in a small amount of sterile distilled water.With the further separation and purification of HPLC, utilize the component of the each peak value of elution curve to carry out anti-microbial activity detection.Identify antimicrobial substance with UPLC/ESI-TOF-MASS.
3. the Bacillus amyloliquefaciens strain antagonism that pair separation obtains produces the smelly plain streptomycete growth of soil and the smelly plain applying detection producing of soil.The Bacillus amyloliquefaciens strain that above-mentioned separation is obtained is inoculated potato-liquid of glucose substratum with the streptomycete bacterial strain that produces native smelly element according to different ratios, and under 30 DEG C of C constant-temperature tables, 200rpm cultivates 50h.With the streptomycete content in qPCR qualification mixed culture; Detect the content (seeing embodiment 2) of native smelly element in co-culture system by headspace solid-phase microextraction gas chromatography combined with mass spectrometry technology (HS-SPME-GC-MS).
4. the antibacterial substance antagonism that pair step 2 is extracted produces the growth of the smelly plain streptomycete of soil and the applying detection that the smelly element of soil produces.The antibacterial substance that extraction is obtained joins inoculation to be had in the potato-liquid of glucose substratum that produces the smelly plain streptomycete bacterial strain of soil, and under 30 DEG C of constant-temperature tables, 200rpm cultivates 50h.With the streptomycete content in qPCR qualification mixed culture; Detect the content (seeing embodiment 3) of native smelly element in co-culture system by headspace solid-phase microextraction gas chromatography combined with mass spectrometry technology (HS-SPME-GC-MS).
Result of implementation
The bacterial strain that we separate by 16S rRNA Analysis deterrmination is bacillus amyloliquefaciens B.amyloliquefaciens.This bacterium produces bacterium S.albus to the smelly element of the soil in white wine production process, S.fradiae, and S.radiopugnans, S.sampsonii, has obvious antibacterial effect.We have successfully been separated to the antimicrobial component of this bacterial strain, are speculated as surfactin and bacillomycin D through Mass Spectrometric Identification.
The Bacillus amyloliquefaciens strain that separation is obtained adds in the substratum of the streptomycete that produces native smelly element by a certain percentage, co-cultivation certain hour, detect analysis through qPCR and HS-SPME-GC-MS, bacillus amyloliquefaciens can significantly suppress the growth of streptomycete and the generation of native smelly element.
HPLC is separated to the antibacterial substance obtaining to be joined in the substratum of streptomycete that produces native smelly element, cultivate certain hour, detect analysis through qPCR and HS-SPME-GC-MS, antibacterial substance significantly antagonism produces the soil growth of smelly plain streptomycete and the generation of native smelly element.
Bacillus amyloliquefaciens provided by the invention derives from high temperature and brewages Daqu, can produce two kinds of antibacterial lipopeptids, can reduce to brewage Daqu Streptomyces content and be up to 100%, reduces the smelly plain concentration of soil in white wine and is up to 100%.
Biomaterial preservation
Bacillus amyloliquefaciens (Bacillus amyloliquefaciens) BA-1, be deposited in Chinese Typical Representative culture collection center (CCTCC) on August 8th, 2013, Wuhan, China. Wuhan. Wuhan University, deposit number is CCTCCNO:M2013368.
Brief description of the drawings
Fig. 1 is the anti-streptomycete activity that bacillus amyloliquefaciens shows on PDA flat board.
80 μ l streptomycete spores (1 × 10 in figure, on PDA flat board, are coated with
8spore/ml), dull and stereotyped central authorities drip the bacillus amyloliquefaciens nutrient solution of 2 μ l incubated overnight.Form obvious inhibition zone in the periphery of bacterial colonies of bacillus amyloliquefaciens.
Fig. 2 is the ESI-TOF-MASS collection of illustrative plates of surfactin.
Fig. 3 is the ESI-TOF-MASS collection of illustrative plates of bacillomycin D.
Embodiment:
Embodiment 1
1. the screening and separating of bacillus amyloliquefaciens BA-1:
The bent powder of Daqu of getting 1g different steps and different bent cake position with aseptic perching knife is in the aseptic plastic centrifuge tube of 5ml.To the physiological saline (0.9% sodium chloride solution) that adds 5ml in centrifuge tube, whirlpool concussion 2 minutes, leave standstill and after 10 minutes, draw 2 μ l dibblings and be coated with streptomycete S.albus, S.fradiae, S.radiopugnans, the dull and stereotyped central authorities of PDA of S.sampsonii spore (cook liquid containing 200g potato, 20g glucose, adding distil water is settled to 1L, adds 15g agar) cultivate 72h in 30 DEG C of constant incubators, detect the size of the inhibition zone of dull and stereotyped central authorities.Choose the bacterium colony of inhibition zone maximum and isolate single bacterial classification at the flat lining out of PDA, dibbling has been coated with streptomycete S.albus respectively, S.fradiae, S.radiopugnans, the dull and stereotyped central authorities of PDA of S.sampsonii spore, the size of observing inhibition zone.The bacterium of the remarkable bacteriostatic activity detecting is carried out to 16SrRNA and identification of morphology.With LB liquid nutrient medium (containing 10g Tryptones, 10g sodium-chlor, 5g yeast powder), 30 DEG C of-37 DEG C of incubated overnight separate the bacterium obtaining, with conventional bacterial genomes extracting method extraction genomic dna.Carry out PCR reaction with the universal primer (synthetic by Shanghai Sheng Gong biotechnology company limited) of measuring 16S rRNA.1% agarose gel electrophoresis detects and amplifies the DNA fragmentation of size for 1.5kb left and right, and delivering Shanghai Sheng Gong Bioisystech Co., Ltd carries out after sequencing being defined as bacillus amyloliquefaciens through Blast comparative analysis in NCBI, homology 98%.
2. bacillus amyloliquefaciens BA-1 is without the preparation of fermented liquid:
Inoculate the bacillus amyloliquefaciens of preserving in the LB substratum of 100ml sterilizing, 37 DEG C, 200rpm overnight incubation.Then inoculate 1ml fresh culture thing in the 2L triangular flask that contains the fresh LB substratum of 1L, 30 DEG C or 37 DEG C, 200rpm cultivates 48h.Then the centrifugal 10min of 8000g collects supernatant, obtains saving backup without 4 DEG C of fermented liquids after the membrane filtration degerming with 0.22 μ l.
3. the purifying of the aseptic Activities of Fermentation Broth material of bacillus amyloliquefaciens BA-1:
By the bacillus amyloliquefaciens obtaining without the isopyknic ethanol of fermented liquid: trichloromethane (1:1) extraction 10-15h.Organic phase is through 60 DEG C of evaporates to dryness of vacuum rotary evaporator (BUCHI, Rotavapor R-210), then dissolves with a small amount of distilled water.The solution obtaining after dissolving adopts HPLC purifying after the membrane filtration of 0.22 micron; 285nm ultraviolet detection; Moving phase is 0.1% formic acid solution and methyl alcohol, collects each and goes out peak component, gets respectively 200 μ l, is added in the Oxford cup in the PDA flat board that is coated with S.albus spore, and 30 DEG C of constant incubators are cultivated 72h, observe the antibacterial situation of each component.
4.UPLC/ESI-TOF-MASS identifies antimicrobial substance
The component with bacteriostatic activity of respectively HPLC being collected is carried out Ultra Performance Liquid Chromatography flight time mass spectrum coupling technique (UPLC/ESI-TOF-MASS) analysis.UPLC adopts UPLC
tMbEH C
18(100mm × 2.1mm, m) chromatographic column of 1.7 μ, using first alcohol and water as moving phase, are carried out linear gradient elution.Mass spectrum adopts positive ion mode, ion scan scope 50 – 1500m/z.Adopt Masslynx4.1 software that data are gathered and analyzed.The results are shown in Figure 2-3, the antibacterial substance molecular weight of separation is 1008 and homologue, is speculated as surfactin; Molecular weight 1031 and homologue, be speculated as bacillomycin D.
Embodiment 2: bacillus amyloliquefaciens BA-1 suppresses the applying detection of streptomycete growth and the smelly element generation of soil
1. bacillus amyloliquefaciens BA-1 and the mixed culture of producing the smelly plain streptomycete Streptomyces albus of soil
The streptomycete bacterial strain Streptomyces albus of the Bacillus amyloliquefaciens strain that separation is obtained and the native smelly element of product is according to 1:10000,1:1000,1:100,1:10, the ratio of 1:1 is (accordingly, the inoculum size of Bacillus amyloliquefaciens strain is respectively 0.1 ‰, 1 ‰, 1%, 10%, 100%) inoculation potato-liquid of glucose substratum, 30 DEG C of constant-temperature table 200rpm cultivate 50h.After fermentation ends, get the centrifugal rear collection thalline of 1ml bacterium liquid, do the biomass estimation of streptomycete bacterial strain Streptomyces albus under mixed culture.The centrifugal thalline of removing of remaining ferment liquid 10000g, after 0.22 μ m filtering with microporous membrane degerming, obtains without fermented liquid, and 4 DEG C of preservations are for subsequent use.
2.qPCR detects co-culture system Streptomyces Streptomyces albus biomass
Adopt the method for absolute quantitation to detect Streptomyces albus biomass in mixed system
According to extracting pure culture streptomycete Streptomyces albus (blank group) genomic dna with conventional bacterial genomes extracting method, and with NanoDrop1000 (NanoDrop Technologies, Wilmington, DE, USA) measure genome concentration, calculate genome copy number.According to 10 times of gradient dilutions, obtain the Streptomyces albus genomic dna of a series of concentration gradients as qPCR template, make the typical curve of genome copy number and qPCR Ct value.20 μ l qPCR systems comprise: SsoFast EvaGreen Supermix10 μ l (Bio-Rad), the each 0.4 μ l of primer, ddH
2o8.2 μ l, template 1 μ l; Amplification program is 98 DEG C of denaturation 2min, 98 DEG C of sex change 5s of 39 circulations, 60 DEG C of 15s.Application Bio-Rad CFX Manager2.1 carries out data acquisition and processing (DAP), obtains the typical curve of genome copy number and qPCR Ct value.
According to the streptomycete Streptomyces albus genomic dna that extracts different bacillus amyloliquefaciens inoculum sizes with conventional bacterial genomes extracting method, dilute 100 times as qPCR template.20 μ l qPCR systems comprise: SsoFast EvaGreen Supermix10 μ l (Bio-Rad), the each 0.4 μ l of primer, ddH
2o8.2 μ l, template 1 μ l; Amplification program is 98 DEG C of denaturation 2min, 98 DEG C of sex change 5s of 39 circulations, 60 DEG C of 15s, 39 circulations.Application Bio-Rad CFX Manager2.1 carries out data acquisition and processing (DAP), calculate the streptomycete Streptomyces albus genome copy number of different bacillus amyloliquefaciens inoculum sizes according to qPCR Ct value and genome copy number and the typical curve of qPCR Ct value, and carry out absolute quantitation, the results are shown in Table 1.Add as can be seen from the results the growth that 1%, 10%, 100% bacillus amyloliquefaciens can effectively suppress streptomycete.
The restraining effect of the B.amyloliquefaciens of table 1 different vaccination amount to S.albus
| B.amyloliquefaciens inoculum size | S.albus inhibiting rate |
| 0% (contrast) | 0 |
| 1％ | 50％ |
| 10％ | 90％ |
| 100％ | 100％ |
3. mixed culture is produced the impact of native smelly element on S.albus
The smelly cellulose content of soil without in fermented liquid of mixed culture adopts HS-SPME-GC-MS method to carry out quantitatively.Get 8ml without fermented liquid, add 3g NaCl to supersaturation.Quantitative result is in table 2.The bacillus amyloliquefaciens that result shows to add different ratios can effectively suppress the generation of native smelly element.
The B.amyloliquefaciens of table 2 different vaccination amount produces the impact of native smelly element on S.albus
| B.amyloliquefaciens inoculum size | The smelly plain inhibiting rate of soil |
| 0% (contrast) | 0 |
| 1％ | 60％ |
| 10％ | 75％ |
| 100％ | 100％ |
Embodiment 3: bacillus amyloliquefaciens BA-1 anti-microbial activity component antagonism produces the applying detection of the smelly plain streptomycete of soil and the smelly element generation of soil
1. add the cultivation of the smelly plain streptomycete Streptomyces albus of product soil of bacillus amyloliquefaciens anti-microbial activity component
HPLC is separated to the anti-microbial activity component obtaining and add in potato-liquid of glucose substratum of the streptomycete bacterial strain Streptomyces albus that produces native smelly element, under 30 DEG C of constant-temperature tables, 200rpm cultivates 50h, and control group is for adding isopyknic methyl alcohol.After fermentation ends, get the centrifugal rear collection thalline of 1ml bacterium liquid, do the biomass estimation of streptomycete bacterial strain Streptomyces albus.The centrifugal thalline of removing of remaining ferment liquid 10000g, after 0.22 μ m filtering with microporous membrane degerming, obtains without fermented liquid, and 4 DEG C of preservations are for subsequent use.
2.qPCR detects streptomycete Streptomyces albus biomass
The making method of the typical curve of qPCR Ct value and genome copy number is with embodiment 2
According to the streptomycete Streptomyces albus genomic dna that extracts different bacillus amyloliquefaciens inoculum sizes with conventional bacterial genomes extracting method, dilute 100 times as qPCR template.20 μ l qPCR systems comprise: SsoFast EvaGreen Supermix10 μ l (Bio-Rad), the each 0.4 μ l of primer, ddH2O8.2 μ l, template 1 μ l; Amplification program is 98 DEG C of denaturation 2min, 98 DEG C of sex change 5s of 39 circulations, 60 DEG C of 15s, 39 circulations.Application Bio-Rad CFX Manager2.1 carries out data acquisition and processing (DAP), obtain the streptomycete Streptomyces albus genome copy number of different bacillus amyloliquefaciens inoculum sizes according to the typical curve of qPCR Ct value and genome copy number, result, as table 3, shows to add the growth that antibacterial component can effectively suppress streptomycete Streptomyces albus.
The restraining effect of the antibacterial component of table 3 to S.albus
| Antibacterial component | S.albus inhibiting rate |
| Contrast | 0 |
| Surfactin | 63％ |
| Bacillomycin?D | 55％ |
3. anti-microbial activity component is produced the impact of native smelly element on S.albus
In the fermented liquid of interpolation anti-microbial activity component, native smelly cellulose content adopts HS-SPME-GC-MS method to carry out quantitatively, and result is as table 4, and result shows to add antibacterial component can effectively suppress the synthetic of native smelly element.
The antibacterial component of table 4 is on producing the impact of native smelly element on S.albus
| Antibacterial component | The smelly plain inhibiting rate of soil |
| Contrast | 0 |
| Surfactin | 100％ |
| Bacillomycin?D | 94％ |
Claims (9)
1. a bacillus amyloliquefaciens (Bacillus amyloliquefaciens) BA-1, separate and brewage Daqu from high temperature, on August 12nd, 2013 is deposited in Chinese Typical Representative culture collection center (CCTCC), and deposit number is CCTCC M2013368.
2. bacillus amyloliquefaciens claimed in claim 1, is characterized in that producing antibacterial substance antibacterial lipopeptid.
3. the bacillus amyloliquefaciens described in claim 1 or 2, is characterized in that the streptomycete (Actinomycetes) to producing native smelly element in brewed spirit process has inhibition growth.
4. bacillus amyloliquefaciens claimed in claim 3, is characterized in that described antibacterial lipopeptid is surfactin and homologue thereof, has following structure:
5. bacillus amyloliquefaciens claimed in claim 3, is characterized in that described antibacterial lipopeptid is bacillomycin D and homologue thereof, has following structure:
6. claim 2 bacillus amyloliquefaciens, is characterized in that described antibacterial lipopeptid suppresses to produce the smelly plain streptomycete of soil in brewed spirit process and grows, and the generation of native smelly element.
7. utilize a method for earthy in bacillus amyloliquefaciens control white wine, it is characterized in that by adding a certain amount of bacillus amyloliquefaciens to control earthy in white wine in brewed spirit process.
8. method claimed in claim 7, it is characterized in that described bacillus amyloliquefaciens can bacterium liquid or solid fungicide form be added into and brewage in Daqu.
9. the method described in claim 7 or 8, the consumption that it is characterized in that described bacillus amyloliquefaciens is 1% to 100% of Daqu Streptomyces total amount, can reduce and brewage Daqu Streptomyces content to 50%-100%, reduce the smelly plain concentration 21%-100% of soil in white wine.
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