CN106434441B - A kind of lactococcus lactis subsp and its application in cheesemaking - Google Patents

A kind of lactococcus lactis subsp and its application in cheesemaking Download PDF

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CN106434441B
CN106434441B CN201610840578.7A CN201610840578A CN106434441B CN 106434441 B CN106434441 B CN 106434441B CN 201610840578 A CN201610840578 A CN 201610840578A CN 106434441 B CN106434441 B CN 106434441B
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lactococcus lactis
culture
lactis subsp
medium
cgmcc
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CN106434441A (en
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焦晶凯
刘振民
苏米亚
郑远荣
刘景�
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Bright Dairy and Food Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/20Bacteria; Culture media therefor
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    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23CDAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING THEREOF
    • A23C19/00Cheese; Cheese preparations; Making thereof
    • A23C19/02Making cheese curd
    • A23C19/032Making cheese curd characterised by the use of specific microorganisms, or enzymes of microbial origin
    • A23C19/0323Making cheese curd characterised by the use of specific microorganisms, or enzymes of microbial origin using only lactic acid bacteria, e.g. Pediococcus and Leuconostoc species; Bifidobacteria; Microbial starters in general
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23VINDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2400/00Lactic or propionic acid bacteria
    • A23V2400/21Streptococcus, lactococcus
    • A23V2400/231Lactis
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    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12RINDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
    • C12R2001/00Microorganisms ; Processes using microorganisms
    • C12R2001/01Bacteria or Actinomycetales ; using bacteria or Actinomycetales
    • C12R2001/46Streptococcus ; Enterococcus; Lactococcus

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Abstract

The invention discloses a kind of lactococcus lactis subsp CGMCC No.10746 and its applications in cheesemaking.The lactococcus lactis subsp (Lactococcus lactis subsp.cremoris) is deposited in China Committee for Culture Collection of Microorganisms's common micro-organisms center, deposit number are as follows: CGMCC No.10746.Its growth performance in cream is good, and phage resistance is good, and acid production speed is moderate, good for producing cheesy flavor, and yield is high, therefore can be used for preparing leavening, to be applied in the production of cheese or other fermented foods.Using cheese fragrance made from the lactococcus lactis subsp bacterial strain, pleasant, excellent flavor, texture are reasonable.It can be seen that the bacterial strain has broad application prospects in preparation of industrialization cheese.

Description

A kind of lactococcus lactis subsp and its application in cheesemaking
Technical field
The present invention relates to dairy product processing fields, and in particular to a kind of lactococcus lactis subsp and its in cheesemaking In application.
Background technique
The preservation that the invention of cheese keeps milk long-term, and different cheese has diversified flavor, texture And character, be one of advantage source of protein, fat and minerals, wherein also containing essential amino acid and vitamin such as VA, VB2, VB6 and VB12.Aged cheese is that the milk acidification that a kind of hard, semi-rigid form protein cross by renin is dense Contracting product.Cheese is one of optimal selection of balanced diet.
One of an important factor for cheesy flavor is the selection of influence consumer spending and acceptance, many western countries receive greatly vigorously The cheese varieties met but rarely have in China makes inquiries.Cheesy flavor depends on the chemical component of cheese complexity itself and by wherein micro- The influence of biology is very big.The formation of cheesy flavor is by a series of complex microorganism, biochemistry and chemical action process.Though Environment of the right cheese microorganism group at major part from local milk supply and locality, but enterprise's production cheese is new there is still a need for adding Strain adjust the flavor of cheese to adapt to the needs of consuming public, therefore contribute cheesy flavor excellent bacterial strain screening It is imperative.
China is more rare to the research of novel species fermented cheese at present, and research and development are suitable for Chinese taste, special with China The Flavor Cheese of color is the historic responsibility of the Chinese government, researcher and Dairy Enterprise.
Summary of the invention
Technical problem to be solved by the present invention lies in prior art blank is filled up, it is sub- to provide a kind of Lactococcus lactis butterfat Kind (Lactococcus lactis subsp.cremoris) and its application in cheesemaking.The Lactococcus lactis Subsp. cremoris can prepare leavening, to be applied to cheesemaking.
Technical solution of the present invention first is that: a kind of lactococcus lactis subsp (Lactococcus lactis Subsp.cremoris), it is deposited in China Committee for Culture Collection of Microorganisms's common micro-organisms center, deposit number are as follows: CGMCC No.10746。
In the present invention, lactococcus lactis subsp CGMCC No.10746 is isolated from the city Inner Mongolia Autonomous Region Lun Beier The self-control dairy products of the black bead bush in Chenbarhu Banner east, the well-grown in cream, acid production speed is moderate, for producing cheese Excellent flavor, yield are high.The bacterial strain is identified, result is lactococcus lactis subsp (Lactococcus lactis Subsp.cremoris), it is named as E11.The bacterial strain is preserved in Chinese microorganism strain preservation management on April 27th, 2015 Committee's common micro-organisms center, and receive collection and register on the books number CGMCC No.10746.
Lactococcus lactis subsp CGMCC No.10746 has Microbiological Characteristics below:
1, morphologic characteristic
The well-grown on M17 culture medium is gram-positive bacteria, and cell is grown in pairs in oval, milky, no It sprouts spore, does not move, no pod membrane.
2, the characteristic that culture is learned
Culture forms precipitating in MRS fluid nutrient medium;Transparent ring can be formed on the agar medium containing calcium carbonate; Amphimicrobian;Chemoheterotrophy, homofermentation metabolism produce acid based on L (+)-lactic acid, do not produce gas, being capable of extracellular polysaccharide.< Well-grown under the conditions of 45 DEG C, 30 DEG C of optimum growth temperature.
3, physiological property
Acid producing ability is strong, and acid production speed is very fast;Curdled milk fast speed, curdled milk viscosity are high;In terms of fermenting characteristic, cream can be precipitated Clearly, curdled milk structural state is good, gives off a strong fragrance;Proteolytic activity is stronger, can by breaks down proteins be polypeptide, amino acid or its Its inorganic, small molecule organic compound.Glucose, galactolipin, maltose and mannitol can be utilized, synanthrin cannot be utilized.
Technical solution of the present invention second is that: it is a kind of to prepare the lactococcus lactis subsp CGMCC No.10746 Method comprising following step cultivates the lactococcus lactis subsp CGMCC No.10746 in the medium.
Wherein, the culture medium is the culture medium of this field routine, and it is sub- can to grow the Lactococcus lactis butterfat Kind CGMCC No.10746, preferably MRS culture medium, M17 culture medium, degreasing milk medium or culture medium A;More preferably For culture medium A, the culture medium A by glucose 23g/L, soy peptone 11g/L, beef extract 11g/L, tryptone 5g/L, Sodium acetate 1.8g/L, K2HPO41.2g/L, sodium citrate 1.2g/L, MgSO4·7H2O 0.4g/L、MnSO4·5H2O 54mg/L、 L-cysteine hydrochloride 0.5g/L and Tween 80 1g/L composition, pH 7.
In the present invention, the MRS culture medium be this field routine MRS culture medium, preferably, its by peptone 10g/L, Beef extract 10g/L, yeast extract 5g/L, citric acid hydrogen diamine 2g/L, glucose 20g/L, tween 1ml/L, sodium acetate 5g/L, phosphoric acid Hydrogen dipotassium 2g/L, magnesium sulfate 0.58g/L and manganese sulfate 0.25g/L composition, pH6.6.
In the present invention, the M17 culture medium is the M17 culture medium of this field routine, preferably, it is by phytone 5g/L, yeast powder 5g/L, polyprotein peptone 5g/L, ascorbic acid 0.5g/L, beef extract 2.5g/L, MgSO4·7H2O 0.01g/L and Phosphoglycerol disodium 19g/L composition, pH7.
In the present invention, the degreasing milk medium be this field routine degreasing milk medium, preferably 10~14% Degreasing milk medium.Skimmed milk powder is dissolved in the water and is mixed up to the degreasing milk medium, the percentage is described de- Fat milk powder accounts for the mass percent of the skimmed milk powder and the water gross mass.
Wherein, the temperature of the culture is the temperature of this field routine, and it is sub- can to grow the Lactococcus lactis butterfat Kind CGMCC No.10746, preferably 26~34 DEG C, be more preferably 30 DEG C.The time of the culture is that this field is conventional Time, preferably 12~48 hours, be more preferably 48 hours.The pH of the culture is the pH, Neng Gousheng of this field routine Lactococcus lactis subsp CGMCC No.10746 described in length, preferably 7.
Preferably, further including the steps that carrying out seed culture using seed culture medium before the culture.The seed Culture is the seed culture of this field routine.The seed culture medium is the seed culture medium of this field routine, preferably Degreasing milk medium is more preferably 12% degreasing milk medium, and the percentage is mass percent.The skimmed milk training Base is supported to sterilize by 115~120 DEG C, 15~20min.The time of the seed culture is the time of this field routine, preferably It is 12~48 hours.The temperature of the seed culture be this field routine temperature, preferably 26~34 DEG C.The seed training Feeding inoculum concentration be this field routine inoculum concentration, preferably 1~3%, the percentage be percent by volume.The seed The algebra of the activation of culture is the algebra of this field routine, preferably 2~3 generations.
Wherein, the method for the culture is the method for the culture of this field routine, preferably shaking flask culture or fermentor Culture.
Technical solution provided by the invention third is that: the lactococcus lactis subsp CGMCC No.10746 is dry Application in junket production.
The cheese is the cheese of this field routine, preferably Ida nurse cheese, Gouda cheese, Cheddar and pa The gloomy cheese of horse.It is more preferably Ida nurse cheese.
Obtained cheese quality is close, and elasticity is moderate, and color is micro- yellow and uniform, has aged cheese characteristic chicken flavor and taste Taste, the cheese yield prepared with the strain is high, and no whey precipitation or rancid in 6~24 months can be stored under non-refrigerated conditions.
On the basis of common knowledge of the art, above-mentioned each optimum condition, can any combination to get each preferable reality of the present invention Example.
The reagents and materials used in the present invention are commercially available.
The positive effect of the present invention is that: the present invention provides a kind of lactococcus lactis subsp CGMCC No.10746 and its application in cheesemaking.Bacterial strain growth performance in cream is good, and phage resistance is good, acid production speed Moderate, produced cheesy flavor is good, and yield is high, therefore can be used for preparing leavening, to be applied to cheese or others In the production of fermented food.Pleasant, excellent flavor, texture using cheese fragrance made from the lactococcus lactis subsp bacterial strain Rationally.It can be seen that the bacterial strain has broad application prospects in preparation of industrialization cheese.
Biomaterial preservation information
Lactococcus lactis subsp E11 of the invention has been deposited in Chinese microorganism strain guarantor on April 27th, 2015 It hides administration committee's common micro-organisms center (CGMCC), preservation address: Yard 1, BeiChen xi Road, Chaoyang District, Beijing City 3, postcode: 100101, deposit number are as follows: CGMCC No.10746, culture title are lactococcus lactis subsps, and classification naming is Lactococcus lactis subsp.cremoris。
Lactococcus lactis subsp. lactis C24 of the invention has been deposited in Chinese microorganism strain guarantor on April 27th, 2015 It hides administration committee's common micro-organisms center (CGMCC), preservation address: Yard 1, BeiChen xi Road, Chaoyang District, Beijing City 3, postcode: 100101, deposit number are as follows: CGMCC No.10744, culture title are Lactococcus lactis subsp. lactis, and classification naming is Lactococcus lactis subsp.lactis。
Lactococcus lactis subsp. lactis C45 of the invention has been deposited in Chinese microorganism strain guarantor on April 27th, 2015 It hides administration committee's common micro-organisms center (CGMCC), preservation address: Yard 1, BeiChen xi Road, Chaoyang District, Beijing City 3, postcode: 100101, deposit number are as follows: CGMCC No.10745, culture title are Lactococcus lactis subsp. lactis, and classification naming is Lactococcus lactis subsp.lactis。
Lactobacillus plantarum G42 of the invention has been deposited in Chinese microorganism strain preservation management committee on April 27th, 2015 Member's meeting common micro-organisms center (CGMCC), preservation address: Yard 1, BeiChen xi Road, Chaoyang District, Beijing City 3, postcode: 100101, Deposit number are as follows: CGMCC No.10747, culture title are lactobacillus plantarums, and classification naming is Lactobacillus plantarum。
Detailed description of the invention
Fig. 1 is the colonial morphology of lactococcus lactis subsp CGMCC No.10746.
Fig. 2 is the growth curve of lactococcus lactis subsp CGMCC No.10746.
Fig. 3 is effect example 2 and the radar for obtaining cheese fermentation later period main flavor prepared by comparative example 2 Figure.
Specific embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality It applies among a range.In the following examples, the experimental methods for specific conditions are not specified, according to conventional methods and conditions, or according to quotient The selection of product specification.
The acquisition of 1 lactococcus lactis subsp CGMCC No.10746 of embodiment
(1), by locality self-control dairy products, (acquisition is revived from the city Inner Mongolia Autonomous Region Lun Beier Chenbarhu Banner east Wu Zhuer Wood) it is taken out from cryopreservation tube, gradient dilution is carried out using sterile water, 10 times of gradient dilution liquid, which are spread evenly across, have passed through 121 DEG C, 15 minutes sterilizing M17 broth bouillon in (M17 broth bouillon be the M17Agar culture medium without containing agar, be purchased from OXOID company, Britain) 30 DEG C culture 48 hours, isolated and purified, carry out microbiologic properties and physiological property screening, chosen full The bacterium colony of sufficient the following conditions: somatic cells are creamy white, oval is grown in pairs, spore of not sprouting, and do not move, no pod membrane, thus According to above-mentioned condition, suitable bacterial strain is isolated;These suitable bacterial strains are cultivated under the conditions of degreasing milk medium, select 48 PH drops to 3.87 after hour, and viscosity 0.215, total peptidase activity is calculated as 1.23 bacterial strain (specific operating condition ginseng with Leu See the embodiment of the present invention 3~4), as bacterial strain E11, oese picking bacterial strain E11 in 3 generation of continuous liquid culture, obtain activation Strain.
(2), the strain of step (1) resulting activation is inoculated in 12% skimmed milk of pH7 with the inoculum concentration of 2% (v/v) (skimmed milk powder cooperates dairy industry Co., Ltd purchased from New Zealand Westland to culture medium, and skimmed milk powder is dissolved in the water mixing i.e. Degreasing milk medium is obtained, the percentage is the quality percentage that the skimmed milk powder accounts for the skimmed milk powder and the water gross mass Than) in, 30 DEG C obtain culture solution in culture 16 hours.
Lactococcus lactis subsp E11 was deposited in Chinese microorganism strain preservation management committee on April 27th, 2015 Member's meeting common micro-organisms center (CGMCC), deposit number are as follows: CGMCC No.10746, culture title are Lactococcus lactis creams Rouge subspecies, classification naming are Lactococcus lactis subsp.cremoris.
The morphological characteristic of 2 lactococcus lactis subsp CGMCC No.10746 of embodiment
After 30 DEG C of M17 culture medium culture lactococcus lactis subsp CGMCC No.10746 48 hours, seen It examines, colonial morphology is as shown in Figure 1.
Wherein, the M17 culture medium is by phytone 5g/L, yeast powder 5g/L, polyprotein peptone 5g/L, ascorbic acid 0.5g/L, beef extract 2.5g/L, MgSO4·7H2O 0.01g/L and phosphoglycerol disodium 19g/L composition, pH7.
As a result, it has been found that lactococcus lactis subsp CGMCC No.10746 well-grown on M17 culture medium, for leather Lan Shi positive bacteria, cell are grown in pairs in oval, and milky, spore of not sprouting does not move, no pod membrane.
The culture characteristic of 3 lactococcus lactis subsp CGMCC No.10746 of embodiment
Using 30 DEG C of M17 culture medium culture lactococcus lactis subsp CGMCC No.10746 48 hours.
The growth curve of lactococcus lactis subsp CGMCC No.10746 is as shown in Fig. 2, wherein ordinate is at this time OD 600nm, abscissa be culture hourage.Fig. 2 explanation, with the extension of time, the bacterial strain constantly rises in value, until culture 22 is small Constantly enter stationary phase.
It sinks the study found that lactococcus lactis subsp CGMCC No.10746 cultivates formation in MRS fluid nutrient medium It forms sediment;Transparent ring is all formed on the agar medium containing calcium carbonate;Its amphimicrobian;Chemoheterotrophy, homofermentation metabolism, produces Acid does not produce gas based on L (+)-lactic acid, being capable of extracellular polysaccharide.Well-grown under the conditions of < 45 DEG C, optimum growth temperature 30 ℃。
The characteristic of 4 lactococcus lactis subsp CGMCC No.10746 of embodiment
A), product acid activity
Lactococcus lactis subsp CGMCC No.10746 is inoculated in by the inoculum concentration of 1% (v/v) equipped with sterilizing In the triangular flask of degreasing milk medium, it is placed in 30 DEG C of constant incubator cultures, one triangular flask of taking-up in every 6 hours, not to be inoculated with The degreasing milk medium of lactococcus lactis subsp CGMCC No.10746 surveys pH value, the results are shown in Table 1 as control.
The rate of producing acid of 1 lactococcus lactis subsp CGMCC No.10746 of table
0 hour 6 hours 12 hours 18 hours 24 hours 30 hours 36 hours 48 hours
pH 7 5.5 5.0 4.88 4.48 4.12 3.90 3.87
As shown in Table 1, lactococcus lactis subsp CGMCC No.10746 acid production speed is very fast, and after 48 hours, pH is only It is 3.87, the sour power of production is stronger, it can be used for the pre-acidified speed of raw material milk, and the formation of acid has the function of being conducive to strengthen renin The dissolution of calcium in effect and cream, convenient for the formation of ziega.
B), the curdled milk time in skimmed milk and curdled milk viscosity measurement
Lactococcus lactis subsp CGMCC No.10746 is inoculated in by the inoculum concentration of 1% (v/v) equipped with sterilizing In the triangular flask of degreasing milk medium, 30 DEG C of constant incubator cultures are placed in, are kept for 48 hours up under its curdled milk, 4 DEG C of environment. Measure the viscosity (mPa/s) of each fermentation yogurt after curdled milk respectively with rotational viscometer (being purchased from proRheo company, Germany).Measurement No. 2 rotors of Shi Xuanyong, speed 64r/s.Every 15 seconds values are primary when measurement, and minute is 3 minutes, and the results are shown in Table 2. As shown in Table 2, lactococcus lactis subsp CGMCC No.10746 curdled milk speed is fast, and curdled milk viscosity is higher.
The curdled milk time of 2 lactococcus lactis subsp CGMCC No.10746 of table and curdled milk viscosity
Bacterial strain The curdled milk time/h Viscosity mPa/s
Lactococcus lactis subsp CGMCC No.10746 24 215
C), fermentation character is tested
Lactococcus lactis subsp CGMCC No.10746 is inoculated in by the inoculum concentration of 1% (v/v) equipped with sterilizing In the triangular flask of degreasing milk medium, 30 DEG C of constant incubator cultures are placed in, until its curdled milk, investigates its curd taste, whey The quality of precipitation situation and grumeleuse, the results are shown in Table 3.
The fermentation character of 3 lactococcus lactis subsp CGMCC No.10746 of table
D), total peptidase activity test of thallus cell-free extract
The lactococcus lactis subsp CGMCC No.10746 cell-free extract of 100 μ g protein content volumes is inoculated with It in 100 μ L substrates, is cultivated 23 hours at 13 DEG C, measures the concentration of total free amino acid in solution, measure each bacterial strain according to this The height of total peptidase activity, wherein (concrete operation step is referring to Zhao for ninhydrin method measurement total free amino acid content using cadmium- It builds, waits screening and its biological characteristic research [J] dairy industry science and technology of peptase superior strain, 2007,123 (2): 69- 72.)。
As a result the total peptidase activity (in terms of Leu) for measuring lactococcus lactis subsp CGMCC No.10746 is 1.23. This illustrates that lactococcus lactis subsp CGMCC No.10746 has certain proteolytic activity, and total peptidase activity value is got over Greatly, the ability of proteolysis is stronger.
E), other physiological characteristics are tested
According to the record of " primary Jie Shi systematic bacteriology handbook " (the 8th edition, 1984, Science Press), to Lactococcus lactis Subsp. cremoris CGMCC No.10746 carries out physiological characteristic test, as a result, it has been found that, glucose, galactolipin, maltose can be utilized And mannitol, synanthrin cannot be utilized.
F), 16S rDNA sequence is analyzed
The analysis of 16S rDNA sequence: the 16S of primer amplification lactococcus lactis subsp CGMCC No.10746 is utilized RDNA segment purifies, recycling, and then carrying out DNA sequencing using sequenator ABI3730-XL, (the upper gloomy promise biotechnology of the Shanghai's style is limited Company).As a result, it has been found that lactococcus lactis subsp CGMCC No.10746 is subjected to alignment in ncbi database, It is 99% with lactococcus lactis subsp sequence homology.Due to when 16S rDNA sequence homology be higher than 97% when, can To be considered of the same race in belonging to, therefore lactococcus lactis subsp CGMCC No.10746 belongs to lactococcus lactis subsp (Lactococcus lactis subsp.cremoris)。
Wherein, the result such as SEQ ID of the 16S rRNA gene sequencing of lactococcus lactis subsp CGMCC No.10746 Shown in NO.1.
To sum up, embodiment 2~4 data explanation, the lactococcus lactis subsp CGMCC No.10746 have with Under Microbiological Characteristics:
1, morphologic characteristic
The well-grown on M17 culture medium is gram-positive bacteria, and cell is grown in pairs in oval, milky, no It sprouts spore, does not move, no pod membrane.
2, the characteristic that culture is learned
Culture forms precipitating in MRS fluid nutrient medium;Transparent ring can be formed on the agar medium containing calcium carbonate; Amphimicrobian;Chemoheterotrophy, homofermentation metabolism produce acid based on L (+)-lactic acid, do not produce gas, being capable of extracellular polysaccharide.< Well-grown under the conditions of 45 DEG C, 30 DEG C of optimum growth temperature.
3, physiological property
Acid producing ability is strong, and acid production speed is very fast;Curdled milk fast speed, curdled milk viscosity are high;In terms of fermenting characteristic, cream can be precipitated Clearly, curdled milk structural state is good, gives off a strong fragrance;Proteolytic activity is stronger, can by breaks down proteins be polypeptide, amino acid or its Its inorganic, small molecule organic compound.Glucose, galactolipin, maltose and mannitol can be utilized, synanthrin cannot be utilized.
The fermentation of 5 lactococcus lactis subsp CGMCC No.10746 of embodiment
Seed culture medium: (skimmed milk powder cooperates the limited public affairs of dairy industry purchased from New Zealand Westland to 12% degreasing milk medium Skimmed milk powder is dissolved in the water and mixes up to degreasing milk medium by department, and the percentage is that the skimmed milk powder accounts for described take off The mass percent of fat milk powder and the water gross mass), the percentage is mass percent.The skimmed milk culture bacterium passes through It sterilizes for 115 DEG C, 15 minutes.
28 DEG C of the cultivation temperature of seed culture medium in seed bottle, cultivation cycle 32 hours, inoculum concentration 1%, described hundred Divide than being the percent by volume for accounting for fermentation medium.Activated for 2 generations in seed culture medium.
Fermentation medium: by glucose 23g/L, soy peptone 11g/L, beef extract 11g/L, tryptone 5g/L, second Sour sodium 1.8g/L, K2HPO41.2g/L, sodium citrate 1.2g/L, MgSO4·7H2O0.4g/L、MnSO4·5H2O 54mg/L、L- Cysteine hydrochloride 0.5g/L and Tween 80 1g/L composition, pH 7.
Cultivation temperature is 30 DEG C, and cultivation cycle 48 hours, culture pH was 7.
The fermentation of 6 lactococcus lactis subsp CGMCC No.10746 of embodiment
Seed culture medium: 12% degreasing milk medium, the percentage are mass percent.Skimmed milk culture bacterium warp 120 DEG C, 20 minutes are crossed to sterilize.
26 DEG C of the cultivation temperature of seed culture medium in seed bottle, cultivation cycle 48 hours, inoculum concentration 3%, described hundred Divide than being the percent by volume for accounting for fermentation medium.Activated for 3 generations in seed culture medium.
Fermentation medium (M17 culture medium): by phytone 5g/L, yeast powder 5g/L, polyprotein peptone 5g/L, Vitamin C Sour 0.5g/L, beef extract 2.5g/L, MgSO4·7H2O 0.01g/L and phosphoglycerol disodium 19g/L composition, pH7.
Cultivation temperature is 26 DEG C, and cultivation cycle 48 hours, culture pH was 7.
The fermentation of 7 lactococcus lactis subsp CGMCC No.10746 of embodiment
Seed culture medium: 10% degreasing milk medium, the percentage are mass percent.Skimmed milk culture bacterium warp 115 DEG C, 15 minutes are crossed to sterilize.
34 DEG C of the cultivation temperature of seed culture medium in seed bottle, cultivation cycle 12 hours, inoculum concentration 2%, described hundred Divide than being the percent by volume for accounting for fermentation medium.Activated for 2 generations in seed culture medium.
Fermentation medium (MRS culture medium): by 20g/L glucose, 10g/L soy peptone, 10g/L beef extract, 5g/L Yeast extract, 5g/L sodium acetate, 2g/L K2HPO4, 2g/L citric acid hydrogen diamine, 0.58g/L MgSO4·7H2O、0.25g/ LMnSO4·5H2O, 0.5g/L L-cysteine hydrochloride and 1ml/L Tween 80 composition, pH6.6.
Cultivation temperature is 34 DEG C, and cultivation cycle 12 hours, culture pH was 6.6.
The preparation of leavening of the embodiment 8 containing lactococcus lactis subsp CGMCC No.10746
Lactococcus lactis subsp E11 is inoculated in the skimmed milk of 12% (w/v) sterilizing by the inoculum concentration of 2% (v/v) In culture medium (cooperating dairy industry Co., Ltd purchased from New Zealand Westland), 30 DEG C of constant incubator cultures 24 hours are placed in, it is living Changed for 2 generations, obtains the bacterial strain of activation.The bacterial strain of activation is inoculated in the skimmed milk of 12% (w/v) sterilizing by the inoculum concentration of 2% (v/v) In culture medium, it is placed in 30 DEG C of constant incubator cultures and expands culture for 24 hours, be repeated 3 times to get the leavening containing E11 1。
The preparation of leavening of the embodiment 9 containing lactococcus lactis subsp CGMCC No.10746
(1), lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis C24 are connect by the inoculum concentration of 2% (v/v) Kind is placed in 30 in the degreasing milk medium (cooperating dairy industry Co., Ltd purchased from New Zealand Westland) that 12% (w/v) sterilizes It DEG C constant incubator culture 24 hours, activated for 2 generations, obtains the bacterial strain of activation.The bacterial strain of activation is connect by the inoculum concentration of 2% (v/v) Kind is placed in 30 DEG C of constant incubator cultures and expands culture for 24 hours in the degreasing milk medium that 10% (w/v) sterilizes, weight It is 3 times multiple.
(2), lactococcus lactis subsp E11, the Lactococcus lactis obtained the resulting culture of step (1) is sub- Kind C24, the ratio that the viable count according to the lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis C24 is 1:1 Mixing is to get the leavening 2 containing E11 and C24.
The preparation of leavening of the embodiment 10 containing lactococcus lactis subsp CGMCC No.10746
(1), lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis C45 are connect by the inoculum concentration of 2% (v/v) Kind is placed in 30 in the degreasing milk medium (cooperating dairy industry Co., Ltd purchased from New Zealand Westland) that 12% (w/v) sterilizes It DEG C constant incubator culture 24 hours, activated for 2 generations, obtains the bacterial strain of activation.The bacterial strain of activation is connect by the inoculum concentration of 2% (v/v) Kind is placed in 30 DEG C of constant incubator cultures and expands culture for 24 hours in the degreasing milk medium that 10% (w/v) sterilizes, weight It is 3 times multiple.
(2), lactococcus lactis subsp E11, the Lactococcus lactis obtained the resulting culture of step (1) is sub- Kind C45, the ratio that the viable count according to the lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis C45 is 1:1 Mixing is to get the leavening 3 containing E11 and C45.
The preparation of leavening of the embodiment 11 containing lactococcus lactis subsp CGMCC No.10746
(1), lactococcus lactis subsp E11, lactobacillus plantarum G42 are inoculated in 12% by the inoculum concentration of 2% (v/v) (w/v) in the degreasing milk medium (cooperating dairy industry Co., Ltd purchased from New Zealand Westland) to sterilize, 30 DEG C of constant temperature trainings are placed in It supports case culture 24 hours, activated for 2 generations, obtain the bacterial strain of activation.The bacterial strain of activation is inoculated in 10% by the inoculum concentration of 2% (v/v) (w/v) in the degreasing milk medium to sterilize, 30 DEG C of constant incubator cultures is placed in and are expanded culture within 24 hours, are repeated 3 times.
(2), lactococcus lactis subsp E11, the lactobacillus plantarum G42 for obtaining the resulting culture of step (1), is pressed The ratio that viable count according to the lactococcus lactis subsp E11, lactobacillus plantarum G42 is 1:1 mixes to contain E11 With the leavening 4 of G42.
The preparation of leavening of the embodiment 12 containing lactococcus lactis subsp CGMCC No.10746
(1), by lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis C24 and Lactococcus lactis subsp. lactis The degreasing milk medium that C45 is inoculated in 12% (w/v) sterilizing by the inoculum concentration of 2% (v/v) (is cooperated purchased from New Zealand Westland Dairy industry Co., Ltd) in, 30 DEG C of constant incubator cultures 24 hours are placed in, activated for 2 generations, obtains the bacterial strain of activation.By the bacterium of activation Strain is inoculated in the degreasing milk medium of 10% (w/v) sterilizing by the inoculum concentration of 2% (v/v), is placed in 30 DEG C of constant incubator trainings It supports 24 hours and expands culture, be repeated 3 times.
(2), lactococcus lactis subsp E11, the Lactococcus lactis obtained the resulting culture of step (1) is sub- Kind C24 and Lactococcus lactis subsp. lactis C45, according to the lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis The ratio that the viable count of C24 and Lactococcus lactis subsp. lactis C45 are 6:2:4 mixes to get the hair containing E11, C24 and C45 Ferment agent 5.
The preparation of leavening of the embodiment 13 containing lactococcus lactis subsp CGMCC No.10746
(1), lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis C24 and lactobacillus plantarum G42 are pressed 2% (v/v) degreasing milk medium that inoculum concentration is inoculated in 12% (w/v) sterilizing is (limited purchased from New Zealand Westland cooperation dairy industry Company) in, 30 DEG C of constant incubator cultures 24 hours are placed in, activated for 2 generations, obtains the bacterial strain of activation.The bacterial strain of activation is pressed 2% (v/v) inoculum concentration is inoculated in the degreasing milk medium of 10% (w/v) sterilizing, is placed in 30 DEG C of constant incubator cultures 24 hours It expands culture, is repeated 3 times.
(2), lactococcus lactis subsp E11, the Lactococcus lactis obtained the resulting culture of step (1) is sub- Kind C24 and lactobacillus plantarum G42, according to the lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis C24 and plant The ratio that the viable count of object lactobacillus G42 is 2:1:1 mixes to get the leavening 6 containing E11, C24 and G42.
The preparation of leavening of the embodiment 14 containing lactococcus lactis subsp CGMCC No.10746
(1), lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis C45 and lactobacillus plantarum G42 are pressed 2% (v/v) degreasing milk medium that inoculum concentration is inoculated in 12% (w/v) sterilizing is (limited purchased from New Zealand Westland cooperation dairy industry Company) in, 30 DEG C of constant incubator cultures 24 hours are placed in, activated for 2 generations, obtains the bacterial strain of activation.The bacterial strain of activation is pressed 2% (v/v) inoculum concentration is inoculated in the degreasing milk medium of 10% (w/v) sterilizing, is placed in 30 DEG C of constant incubator cultures 24 hours It expands culture, is repeated 3 times.
(2), lactococcus lactis subsp E11, the Lactococcus lactis obtained the resulting culture of step (1) is sub- Kind C45 and lactobacillus plantarum G42, according to the lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis C45 and plant The ratio that the viable count of object lactobacillus G42 is 3:1:1 mixes to get the leavening 7 containing E11, C45 and G42.
The preparation of leavening of the embodiment 15 containing lactococcus lactis subsp CGMCC No.10746
(1), by lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis C24, Lactococcus lactis subsp. lactis C45 and lactobacillus plantarum G42 is inoculated in the degreasing milk medium of 12% (w/v) sterilizing by the inoculum concentration of 2% (v/v) (purchased from new West orchid Westland cooperates dairy industry Co., Ltd) in, 30 DEG C of constant incubator cultures 24 hours are placed in, activated for 2 generations, obtains activation Bacterial strain.The bacterial strain of activation is inoculated in the degreasing milk medium of 10% (w/v) sterilizing by the inoculum concentration of 2% (v/v), is placed in 30 It DEG C expands culture within constant incubator culture 24 hours, is repeated 3 times.
(2), lactococcus lactis subsp E11, the Lactococcus lactis obtained the resulting culture of step (1) is sub- Kind C24, Lactococcus lactis subsp. lactis C45 and lactobacillus plantarum G42, according to the lactococcus lactis subsp E11, lactic acid The viable count of galactococcus lactic acid subspecies C24, Lactococcus lactis subsp. lactis C45 and lactobacillus plantarum G42 are the ratio of 20:1:2:2 Example mixing is to get the leavening 8 containing E11, C24, C45 and G42.
The preparation of leavening of the embodiment 16 containing lactococcus lactis subsp CGMCC No.10746
(1), by lactococcus lactis subsp E11, Lactococcus lactis subsp. lactis C24, Lactococcus lactis subsp. lactis C45 and lactobacillus plantarum G42 is inoculated in the degreasing milk medium of 12% (w/v) sterilizing by the inoculum concentration of 2% (v/v) (purchased from new West orchid Westland cooperates dairy industry Co., Ltd) in, 30 DEG C of constant incubator cultures 24 hours are placed in, activated for 2 generations, obtains activation Bacterial strain.The bacterial strain of activation is inoculated in the degreasing milk medium of 10% (w/v) sterilizing by the inoculum concentration of 2% (v/v), is placed in 30 It DEG C expands culture within constant incubator culture 24 hours, is repeated 3 times.
(2), lactococcus lactis subsp E11, the Lactococcus lactis obtained the resulting culture of step (1) is sub- Kind C24, Lactococcus lactis subsp. lactis C45 and lactobacillus plantarum G42, according to the lactococcus lactis subsp E11, lactic acid The viable count of galactococcus lactic acid subspecies C24, Lactococcus lactis subsp. lactis C45 and lactobacillus plantarum G42 are the ratio of 5:2:1:2 Mixing is to get the leavening 9 containing E11, C24, C45 and G42.
Effect example 1
(1) 50L raw milk (being purchased from Kingsoft pasture) is filtered, is stirred evenly, it is cooling after 72 DEG C, 2min pasteurize To 31 DEG C.Leavening 1 made from embodiment 8 is poured into the raw milk after pasteurize, the dense of the leavening 1 in raw milk is made Degree is 2%, and the percentage is percent by volume.0.5g/50L renin (Fromase is added while leavening is added 750XLG is purchased from Chr. Hansen A/S), it cultivates under 31 DEG C of constant temperature to pH 6.5.
It 2) is 1cm at volume by curd cutting made from step 1)3Grumeleuse, all creams are discharged after being slowly stirred 10min Clearly;It is added salt salt marsh 20 hours of 2.5%, the percentage is mass percent.Enter square dies later, is put on mold One keg water (about 1.0 kilograms) is simultaneously periodically overturn, and the time continues 12h.It is 10 DEG C later, 4 months mature, obtain Cheddar.
Effect example 2
(1) 50L raw milk is filtered, is stirred evenly, 28 DEG C are cooled to after 75 DEG C, 2min pasteurize.It will implement Leavening 5 made from example 12 pours into the raw milk after pasteurize, makes the concentration 1% of the leavening 5 in raw milk, described Percentage is percent by volume.0.8g/50L renin is added while leavening is added, and (Fromase 750XLG, is purchased from Chr. Hansen A/S), it cultivates under 28 DEG C of constant temperature to pH 6.5.
It 2) is 1.2cm at volume by curd cutting made from step 1)3Grumeleuse, be slowly stirred 20min.Then exist In 45min, temperature is increased to 40 DEG C from 28 DEG C.It is then discharged out all whey;It is added salt salt marsh 20 hours of 2%, it is described Percentage is mass percent.Enter square dies later, a keg water (about 1.0 kilograms) is put on mold and periodically overturns, when Between continue 15 hours.Then 15 DEG C, 3 months mature, obtain Ida nurse cheese.
Effect example 3
(1) 50L raw milk is filtered, is stirred evenly, 32 DEG C are cooled to after 75 DEG C, 3min pasteurize.It will implement Leavening 8 made from example 15 pours into the raw milk after pasteurize, makes the concentration 1% of the leavening 8 in raw milk, described Percentage is percent by volume.0.3g/50L renin is added while leavening is added, and (Fromase 750XLG, is purchased from Chr. Hansen A/S), it cultivates under 32 DEG C of constant temperature to pH 6.5.
It 2) is 1.4cm at volume by curd cutting made from step 1)3Grumeleuse, be slowly stirred 20min.It is used at 35 DEG C Water washing grumeleuse, and it is kept stirring 25min.It is then discharged out all whey.Square dies are added, squeeze 75min, are acidified 1 hour. Add 2% salt salt marsh 4 days, the percentage is mass percent.Then 12 DEG C, 6 months mature, it obtains cutting up to dry Junket.
Effect example 4
(1) 50L raw milk is filtered, is stirred evenly, 30 DEG C are cooled to after 73 DEG C, 3min pasteurize.It will implement Leavening 9 made from example 16 pours into the raw milk after pasteurize, makes the concentration 1% of the leavening 9 in raw milk, described Percentage is percent by volume.0.7g/50L renin is added while leavening is added, and (Fromase 750XLG, is purchased from Chr. Hansen A/S), it cultivates under 30 DEG C of constant temperature to pH 6.5.
It 2) is 1.0cm at volume by curd cutting made from step 1)3Grumeleuse.Then in 30min, by temperature from 30 DEG C are increased to 39 DEG C, and are kept stirring 1 hour.It is then discharged out all whey.Square dies, dry salt salt marsh 2 days is added.Then It is 12 DEG C, 5 months mature, obtain Gouda cheese.
Comparative example 1
Cheddar is made using commercial fermentation agent CHOOZITTM RM 32 (DANISCO company).Contain in the leavening Lactococcus lactis subsp, lactococcus lactis subsp, Lactococcus lactis biacetyl subspecies and streptococcus thermophilus.
Remaining preparation method is identical with the preparation method of effect example 1.
Comparative example 2
Ida nurse cheese is made using commercial fermentation agent FD-DVS R-704 (Chr. Hansen A/S).In the leavening Contain lactococcus lactis subsp and lactococcus lactis subsp.
Remaining preparation method is identical with the preparation method of effect example 2.
Comparative example 3
Commercial fermentation agent FD-DVS CHN-22 (Chr. Hansen A/S) makes Cheddar.Contain in the leavening Lactococcus lactis subsp, lactococcus lactis subsp, Lactococcus lactis biacetyl subspecies and leukonid.
Remaining preparation method is identical with the preparation method of effect example 3.
Comparative example 4
(1) by Lactococcus lactis subsp. lactis BD164 (deposit number are as follows: CGMCC No.10751), Lactococcus lactis cream Sour subspecies BD2263 (deposit number are as follows: CGMCC No.10749), Lactococcus lactis subsp. lactis BD401 (deposit number are as follows: CGMCC No.10752) and Leuconostoc mesenteroides LM79 (deposit number are as follows: CGMCC No.10750) press 2% (v/v) inoculation Amount is inoculated in the degreasing milk medium (cooperating dairy industry Co., Ltd purchased from New Zealand Westland) of 10% (w/v) sterilizing, is set In 30 DEG C constant incubator culture 24 hours, activate 2 generations, obtain the bacterial strain of activation.The bacterial strain of activation is pressed to the inoculation of 2% (v/v) Amount is inoculated in the degreasing milk medium of 10% (w/v) sterilizing, is placed in 30 DEG C of constant incubator cultures and is carried out expansion training in 24 hours It supports, is repeated 3 times, obtain culture.
(2) the resulting culture of step (1) is obtained into Lactococcus lactis subsp. lactis BD164, Lactococcus lactis Asia Kind BD2263, Lactococcus lactis subsp. lactis BD401 and Leuconostoc mesenteroides LM79, then according to the Lactococcus lactis Subspecies BD401, the Lactococcus lactis subsp. lactis BD2263, the Lactococcus lactis subsp. lactis BD164 and the goldbeater's skin The ratio that the viable count of leukonid LM79 is 1:1:1:1 mixes, and obtains cheese starter A.
(3) Cheddar is made using cheese starter A.Remaining preparation method and the preparation method of effect example 1 are complete It is exactly the same.
The measurement of flavor substance in 1 cheese of Application Example
Using low-polarity components (GC-MS), (referring to Wu Gu equality, gas chromatograph-mass spectrometer method measures amino first in 7 in vegetables 1999,15 (6): ester pesticide, Chinese public health 534), measure effect example 1,4 and comparative example 1,4 are made The flavor substance of standby cheese.The results are shown in Table 4.
4 cheese of table fermentation initial stage main flavor and its content
Wherein, the meaning of "-" indicates that content down under minimum detection value, can be estimated without containing the substance.It can by table 4 It is compared with finding out with the Ida cheese of commercial fermentation agent preparation (i.e. the cheese of the preparation of comparative example 1) and comparative example 4, The aged cheese of the resulting leavening production of the special bacterial strain that the present invention selects has special aromatic substance different at fermentation initial stage Amylalcohol, isoamyl alcohol mainly have calvados fragrance and acid.And other key aroma ingredients and commercial fermentation agent preparation Ida cheese has significant difference compared to content.
Application Example 2
Using low-polarity components (GC-MS), cheese prepared by effect example 2,3 and comparative example 2,4 is measured Aromatic substance.The results are shown in Table 5.Fig. 3 is the radar map of these aromatic substance contents.
The measurement of aromatic substance content in 5 cheese of table
Wherein, the meaning of "-" indicates that content down under minimum detection value, can be estimated without containing the substance.By 5 He of table Fig. 3 can be seen that effect example preparation cheese in also detect butyric acid, 1,2,4- trimethylbenzene, amylalcohol, cyclohexanone, 1- second - 2,3 dimethyl benzene of base, 3- methyltridec, 2,6,10- trimethyldodecane, acrylic acid-2-ethyl caproite, longifolene, adjacent benzene Dibutyl carboxylic acid, and above-mentioned substance is not detected in the cheese of comparative example preparation.
Application Example 3
It is using Texture instrument (being purchased from Britain Stable Micro Systems company), effect example 1,2 and comparison is real Apply the measurement that the equal prepared cheese of example 3 carries out texture characteristic.Wherein, measurement method is to push, test speed 5.00mm/ seconds; Testing time is 5 seconds;Probe type is P/5 probe, and every group of sample is measured in parallel 5 times.The results are shown in Table 6.
The measurement of 6 cheese texture characteristic of table
Embodiment Hardness/g Viscosity Elasticity
Effect example 1 1301.66±38.32 -40.00±7.64 0.25±0.04
Effect example 2 1206.85±55.36 -39.74±5.46 0.32±0.08
Comparative example 3 1026.34±215.84 -40.50±6.76 0.21±0.06
Application Example 4
Subjective appreciation experiment
This subjective appreciation personnel include 12 personnel for being engaged in food research, are familiar with subjective appreciation points for attention and comment Minute mark is quasi-.Total score is 50 points, and score is evaluated in accordance with table 7.Each assessment officer independently evaluates, and uses clear water when replacing sample every time It gargles, the results are shown in Table 8.
7 cheese subjective appreciation method of table
8 cheese results of sensory evaluation of table
The result of table 8 illustrates, cheese produced by the present invention characteristic odor, in terms of be substantially better than comparison and implement Cheese obtained by example, whole scoring are also relatively high.
It should be understood that those skilled in the art can make the present invention various after having read above content of the invention Change or modification, these equivalent forms also fall within the scope of the appended claims of the present application.

Claims (12)

1. a kind of lactococcus lactis subsp (Lactococcus lactis subsp.cremoris), which is characterized in that its It is deposited in China Committee for Culture Collection of Microorganisms's common micro-organisms center, deposit number are as follows: CGMCC No.10746.
2. a kind of method for preparing lactococcus lactis subsp CGMCC No.10746 as described in claim 1, feature It is comprising following step cultivates the lactococcus lactis subsp CGMCC No.10746 in the medium.
3. method according to claim 2, which is characterized in that the culture medium is MRS culture medium, M17 culture medium, skimmed milk Culture medium or culture medium A, the culture medium A is by glucose 23g/L, soy peptone 11g/L, beef extract 11g/L, tryptone 5g/L, sodium acetate 1.8g/L, K2HPO4 1.2g/L, sodium citrate 1.2g/L, MgSO4•7H2O 0.4g/L、MnSO4•5H2O 54mg/L, L-cysteine hydrochloride 0.5g/L and Tween 80 1g/L composition;The MRS culture medium is by peptone 10g/L, ox Meat extract 10g/L, yeast extract 5g/L, citric acid hydrogen diamine 2g/L, glucose 20g/L, tween 1ml/L, sodium acetate 5g/L, phosphoric acid hydrogen Dipotassium 2g/L, magnesium sulfate 0.58g/L and manganese sulfate 0.25g/L composition;The M17 culture medium is by phytone 5g/L, yeast Powder 5g/L, polyprotein peptone 5g/L, ascorbic acid 0.5g/L, beef extract 2.5g/L, MgSO4•7H2O 0.01g/L and phosphoglycerol two Sodium 19g/L composition;The degreasing milk medium is 10 ~ 14% degreasing milk mediums, and the percentage is mass percent.
4. method as claimed in claim 3, which is characterized in that the culture medium is the culture medium A.
5. method according to claim 2, which is characterized in that the temperature of the culture is 26 ~ 34 DEG C;The time of the culture It is 12 ~ 48 hours.
6. method as claimed in claim 5, which is characterized in that the temperature of the culture is 30 DEG C.
7. method according to claim 2, which is characterized in that further include being planted using seed culture medium before the culture The step of son culture;The seed culture is degreasing milk medium.
8. the method for claim 7, which is characterized in that the degreasing milk medium is 12% degreasing milk medium, described Percentage be mass percent;The degreasing milk medium sterilizes by 115 ~ 120 DEG C, 15 ~ 20min.
9. the method for claim 7, which is characterized in that the temperature of the seed culture is 26 ~ 34 DEG C;The seed training The feeding time is 12 ~ 48 hours.
10. the method for claim 7, which is characterized in that the inoculum concentration of the seed culture is 1 ~ 3%, the percentage For percent by volume;The algebra of the activation of the seed culture was 2 ~ 3 generations.
11. a kind of lactococcus lactis subsp CGMCC No.10746 answering in cheesemaking as described in claim 1 With.
12. application as claimed in claim 11, which is characterized in that the cheese is Ida nurse cheese, Gouda cheese and cuts Up to cheese.
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