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Nutrient milk medium for preparation of bacteria-probiotics biomass

IPC classes for russian patent Nutrient milk medium for preparation of bacteria-probiotics biomass (RU 2326939):
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Invention relates to the strain Lactobacillus paracasei CNCM I-2116 used for diarrhea prophylaxis causing by pathogenic microorganisms. Supernatant of this strain culture elicits ability to prevent colonization of intestine with pathogenic microorganisms causing diarrhea also and this strain is designated for preparing agent used for prophylaxis and/or treatment of disorders associated with diarrhea. Agent for oral administration represents therapeutically effective dose of the strain L. paracasei CNCM I-2116 or supernatant of its culture and acceptable foodstuff. Invention provides the enhanced viability of the strain in its applying and effectiveness in prophylaxis of adhesion to intestine cells and invasion to intestine cells of pathogenic microorganisms causing diarrhea.

FIELD: technological processes.

SUBSTANCE: invention is related to preparation of nutrient mediums for cultivation of bifido and lactobacteria with the purpose of preparation of microorganisms biomass and its further utilisation in production of ferments for medicinal and prophylactic products, and also for production of dietary supplements (DS). Milk nutrient medium contains the basis in the form of non-fat milk with content of solid residual 13-14%, muriatic cysteine or ascorbic acid, lactopeptone, purified yeast extract with index of amine nitrogen 2.1-2.8%, total protein of at least 3-4%, sodium chloride, manganese sulphate heptahydrate and manganese sulphate tetrahydrate.

EFFECT: provides for the possibility of bifido and lactobacteria cultivation with longer shelf life and with higher titres of bacteria biomass in the process of storage.

2 cl, 4 tbl, 5 ex

 

The invention relates to biotechnology and can be used in microbiological, food industry and for the preparation of nutrient media for cultivation of bifidobacteria and lactobacilli with the aim of obtaining biomass of microorganisms and its further use in the production of starter cultures for therapeutic products, as well as for production of biologically active additives (BAA).

Currently, the food and dietary Supplement with probiotic microorganisms occupy a leading place in the complex of measures aimed at the prevention and correction of disorders of the microflora. The importance of probiotic preparations and products requires the development of new efficient low-cost production of culture media for producing microbial mass. In the manufacture of dietary supplements with probiotics, as well as therapeutic products and starter cultures is important for them is to develop a nutritional basis for probiotic microorganisms. Such a framework should include all the basic components that match the needs of the bacteria. Cultivation in this environment should contribute at least the preservation of probiotic properties of microorganisms. Production nutrient medium should provide a high speed reproduction: the varnish is of bacteri up to 5-7 hours and bifidobacteria to 18 hours, a high concentration of viable microbial cells in a unit volume of the medium is not less than 1·1010CFU/ml, the high conservation of viable microbial cells - at least 70-90 days.

Nutritional requirements of lactic acid bacteria are very diverse and are associated with biochemical activity of microorganisms. As enrichment medium protein increases the ability of bacteria to brivati lactose, adding Peptones and peptides (products of protein hydrolysis) enhances the growth of lactic acid bacteria to a much greater extent than amino acids. It should be noted that the number of amino acids required by various lactic acid bacteria, is variable and depends on the needs of the strains. The bifidobacteria are the most required amino acids: Proline, serine, alanine, aspartic and glutamic acid. Having some proteolytic activity, bifidobacteria can to a small extent to additionally provide for their needs in nitrogenous substances.

All the nutrients in the environment must be in easily digestible form, proteins, in particular, in the form of hydrolysates, autolysates. In some cases imperfect technology of obtaining protein hydrolysates and autolysates can cause them significant amounts of the peptides of high molecular weight, ammonia, and OCD is Chenin impurities, formed due to the decomposition of labile amino acids and interaction with aldehydes. The presence of these components in the environment significantly reduces nutrient efficiency. The quality of protein hydrolysates largely due to the chosen method of carrying out hydrolysis providing the desired degree of hydrolysis and degree of subsequent treatment of the resulting hydrolysate.

For increasing biomass use nutrient media of different composition. Known composition of the nutrient medium for the growth of bifido - and lactobacteria, representing a hydrolysate of milk, which is introduced as additives peptone, sodium chloride, agar-agar, lactose, cysteine hydrochloric acid, in the following ratio of components (instructions for the preparation of fermented milk bifidumbakterin at milk kitchens. - M.: RSFSR Ministry of health, 1987, - 11 C.), g/l:

Peptone 2,0
Sodium chloride 5,00
Agar-agar 0,75
Lactose 10,00
Cysteine hydrochloric acid 0,10
Hydrolyzed milk the rest of it.

This composition finds application in practice for the growth of bifido - and lactobacteria.

However, along with the road base - hydrolysis of the volume of milk it contains and expensive supplements such as peptone, cysteine hydrochloric acid. In addition, this composition is not sufficiently effective nutrient medium for cultivation of bifidobacteria and lactobacilli.

Known nutrient medium for growing the biomass of bifidobacteria and lactobacilli-based hydrolysate of pea in the following ratio of components (RF Patent No. 2061037, IPC 12N 1/20, publ. 27.05.96 g), wt.%:

Peptone 0,15-0,25
Sodium chloride 0,2-0,4
Agar-agar 0,075-a 0.1
Lactose 0,5-2,0
The hydrolysate of pea, diluted with water to
the content of amino nitrogen 130-150 mg % the rest is up to 100%.

The composition has a low content of low molecular weight peptides and amino acids (Amino nitrogen 130-150 mg%), therefore, does not provide a time of high biomass concentration is not more than 108CFU/ml At the same time, the increase in microbial mass (not less than 24 hours), titratable acidity and terms of preservation do not meet the requirements.

Also known nutrient medium for the accumulation of biomass of bacteria on the basis of whey in the following ratio of components (RF Patent No. 2087532, IPC 12N 1/20, publ. 20.08.97 g), wt%:

Whey clarified 7,5-10,0
Lactose 0,3-0,5
Yeast autolysate 2,0-3,0
D, L-cysteine the 0.05-0.1
NaH2PO4·2H2O 0,7-0,8
NH4Cl 0,1-0,15
MgSO4·7H2O 0,015-0,020
Agar-agar 0,75-0,080
Water rest
pH 7,2-7,4

Medium of similar composition, but gives a high rate of growth, does not have enough nutrients (proteins, peptides, amino acids) for long-term preservation of microbial cells, which is very important for drugs and dietary SUPPLEMENTS-probiotics. An additional effect of high growth parameters is a significant increase in titratable acidity, negatively affecting the organoleptic properties of the final product. The presence of expensive components (agar-agar, cysteine) in the production of drugs and SUPPLEMENTS-probiotics increases the cost of the final product.

Widely known corn-lactose medium (CCL) for the cultivation of bifidobacteria and lactic acid bacteria (TU 10-02-02-789-192-95):

Agar-agar 2.5 g
Peptone 10 g
Corn extract 40 ml
Sodium citrate 6.6 g
Magnesium sulfate 0.12 g
Potassium phosphate disubstituted 2,0
Lactose 10 g
Cystine hydrochloric acid 0.15 g

However, CCL does not contain hydrolyzed protein components of milk or yeast cells, which does not ensure the cultivation of long term safety of the final product. The presence in the environment of non-standard component - corn extract causes the irregularity of the medium, as well as unsatisfactory organoleptic properties of the resulting BAD and sourdough.

The closest analogue (prototype) to declare milk is a nutrient medium to obtain a liquid concentrate of bifidobacteria containing the basis cysteine hydrochloric acid (L-cystine), D(-)-lactose, hydrolyzed milk proteins and autolysate yeast and sodium chloride. As a hydrolysate of milk proteins using pancreatic hydrolysate of milk products milk, as autolysate yeast using enzymatic autolysate yeast, and is used as a base normals is consistent on the dry rest skim milk milk when the total content of amino nitrogen in the nutrient medium 260-300 mg% in the following ratio of its components, wt.% (patent RF №2169763, IPC C12N 1/20, AK 35/74, AS 9/12, publ. 27.06.2001,):

Pancreatic hydrolysate of milk products milk 5,0-7,0
Cysteine hydrochloric acid (L-cystine) 0,001-0,003
D(-)-lactose 0,03-0,09
Sodium chloride 0,01-0,05
Enzymatic autolysate yeast 1,0-2,0
Milk products milk (base), normalized
on the dry rest The rest is up to 100%.

As enzymatic autolysate yeast use autolysate with the indicator amino nitrogen 350-400 mg%. Milk products milk normalized to the dry residue to the value of 13.0-14%. In addition, the culture medium was additionally make soy protein isolate in an amount by weight of 0.2-0.3%. To activate soy protein isolate in nutrient medium further added sodium citrate in an amount by weight of 0.1-0.2%.

However, pancreatic hydrolysate of proteins of milk products milk contains, along with high and low molecular weight peptides partially hydrolyzed casein and other components, which are poorly digested by the bacteria and enzymatic autolysate yeast along with vitamins and stimulating growth factors bacteria contain toxic in the society - the products of enzymatic autolysis, which do not favor the growth of bacteria (Themeroller, Avhub and Lpositive. Effect of enzymatic hydrolysates on the accumulation of biomass of bifidobacteria. Journe. "The dairy industry", No. 12, 1980, - p.15-17), which would reduce the time and title of the biomass of bifidobacteria and lactobacilli in storage.

The technical result of the claimed invention is to provide such a medium, which would provide the possibility of cultivation as bifidobacteria and lactobacilli for longer storage times and higher titers biomass of bacteria during storage.

This technical result is achieved by the fact that the dairy nutrient medium to obtain the biomass of bacteria-probiotics containing Foundation, normalized to the dry residue of skim milk milk, cysteine hydrochloric acid (L-cystine) or ascorbic acid, hydrolyzed milk proteins and growth factors from yeast cells, sodium chloride, according to the invention, the medium further comprises manganese sulfate MnSO4·4H2O and magnesium sulfate MgSO4·7H2Oh, as a hydrolysate of milk proteins using enzymatic hydrolysate of whey proteins of milk, as growth factors from yeast cells using the untreated yeast extract in the following ratio of its components, wt.%:

enzymatic hydrolysate of whey
milk proteins 5,0-7,0
cysteine hydrochloric acid (Ĺ-cystine)
or ascorbic acid 0,001-0,002
sodium chloride 0,03-0,05
manganese sulfate MnSO4·4H2About 0,001-0,005
magnesium sulfate MgSO4·7H2O 0,01-0,02
purified yeast extract 1,5-2,0
Milk products milk (base), normalized
on the dry rest The rest is up to 100%

Dairy nutrient medium contains purified yeast extract with the indicator amino nitrogen 2,1-2,8%, total protein not less than 3-4%, enzymatic hydrolyzed whey proteins of milk (lactate) with the index of total protein not less than 11%, the amine nitrogen of not less than 4%, and skim milk milk contains lactose in an amount not exceeding 15%, and normalized to the dry residue to the value 13,0-14,0%.

The total amine nitrogen in the nutrient medium contains not less than 300 mg%.

Introduction to the basis environment enzymatic hydrolysate (bactopeptone) whey proteins milk is (lactalbumin and lactoglobulin) provides enriching it with a mixture of high molecular weight and low molecular weight peptides, which are more effective stimulants of growth of bifidobacteria and lactobacilli than, for example, pancreatic hydrolysate of proteins (the main component - casein) milk skim milk. Whey milk proteins by amino acid composition similar to proteins of breast milk. In comparison with casein they are more easily subjected to complete hydrolysis, contain essential sulfur-containing acid in an amount corresponding to the human needs 4 times more contain cysteine and 19 times more tryptophan and their use is preferred in the production of probiotics for children.

Purified extract of yeast contains b vitamins and stimulating factors in the growth of bifidobacteria, as well as the optimal content of amino nitrogen, ensuring the most favorable conditions for the growth of bifidobacteria and lactobacilli compared with enzymatic autolysate yeast does not contain toxic products of yeast metabolism, inhibit the growth of bacteria.

Noticeable improvement of the quality yeast extract is achieved by improving the production technology is translated into a soluble state 30-50% yeast protein, increasing the digestibility of cell protein by 8-10% by loosening all of the layers of the cell wall.

Yeast extract contains:

essential amino acids - lysine, met the onin war, glycine, alanine, histidine, aspartic acid, threonine, glutamic acid, valine, and others;

- vitamins - Riboflavin (b2), thiamine (1), pyridoxine (B6), ciankobalamin (12), Niacin (PP);

- protective peptides.

Components, providing the reducing properties of the inventive environment are mainly cysteine or ascorbic acid, and amino acids glutamine and asparagine, which are rich in purified yeast extract, which is part of the environment.

To ensure the growth and development of lactic acid bacteria need in inorganic compounds, especially in manganese ions and magnesium ions. Manganese prevents autolysis of cells and is necessary for normal processes of fat metabolism. Mn++and Mg++remove toxic effect of Zn++if present in the environment.

The invention allows to obtain a high initial titer and to increase the shelf life without oppression growth and an increase in active acidity of probiotic preparations obtained using the proposed nutrient medium.

The lack of ready nitrogenous substances in the inventive culture medium can be recovered by adding skim milk bactopeptone (enzymatically hydrolyzed whey proteins of milk and yeast extract. Whey milk proteins play an important role in increasing bio is assy probiotic bacteria and the formation of the quality of the final product, because they have a high content of essential and sulfur-containing amino acids. Proteins dairy base (mainly casein) are characterized by high biological value and a unique set of amino acids that helps improve overall balance of amino acid composition of the final product. Milk contains a unique disaccharide is lactose, which has a beneficial effect on the composition normoflora intestine. When heating milk, for example during sterilization, lactose is transformed into lactulose, which is a powerful bifidogenic factor. Milk contains a significant amount of macro - and micronutrients, vitamins. Especially important digestible milk calcium, vitamins A, B1In2, D, C, carotene.

The following are examples of compositions of the claimed nutrient medium.

Example 1. The minimum content of the components (wt.%):

the enzymatic hydrolysate
whey proteins milk 5,0
cysteine hydrochloric acid (Ĺ-cystine) 0,001
sodium chloride 0,03
manganese sulfate MnSO4·4H2About 0,001
magnesium sulfate MgSO4·7H2O 0,01
purified yeast extract 1,5
Milk products milk (base), normalized
on the dry rest The rest is up to 100%

Example 2. The average content of components (wt.%):

enzymatic hydrolysate of whey
milk proteins 6,0
ascorbic acid 0,0015
sodium chloride 0,04
manganese sulfate MnSO4·4H2About 0,003
magnesium sulfate MgSO4·7H2O 0,015
purified yeast extract 1,7
Milk products milk (base), normalized
on the dry rest The rest is up to 100%

Example 3. The maximum content of components (wt.%):

enzymatic hydrolysate of whey
milk proteins 7,0
cysteine hydrochloric acid (Ĺ-cystine) 0,002
sodium chloride 0,05
manganese of Sirnak sly MnSO 4·4H2About 0,005
magnesium sulfate MgSO4·7H2O 0,02
purified yeast extract 2,0
Milk products milk (base), normalized
on the dry rest The rest is up to 100%

The following data (tables 1 and 2) for the cultivation of bifidobacteria (Bifidobacterium bifidum 791 BUG) and lactobacilli (strain Lactobacillus Lactobacillus acidophilus 57S) using the claimed nutrient medium and environment of the prototype. From these tables it is seen that the titer as bifidobacteria and lactobacilli after cultivation with the use of the claimed nutrient medium several times higher than with the use environment of the prototype, and the cultivation correspondingly less.

Table 1
The titer of lactic acid bacteria and the activity of acid generating under cultivation in the claimed nutrient medium
№ p/p The composition of the medium The initial titer, CFU/ml Acidity, °T The time of ripening, h
1 Example 1 1,2·1010 115 4,0
2 Example 2 2,5·1010 120 3,5
3 Example 3 1,5·1010 126 4,0
4 Wednesday-prototype 7,0·109 107 5,0
Table 2
The titer of bacteria and the activity of acid generating under cultivation in the claimed nutrient medium
№ p/p The composition of the medium The initial titer, CFU/ml Acidity, °T The time of ripening, h
1 Example 1 4·1010 130 16
2 Example 2 1·1010 145 18
3 Example 3 1·1010 155 >18
4 Wednesday-prototype 2·109 124 24-30

Example 4. Study of the retention of the consortium of strains of lactic acid bacteria in a liquid concentrate of Lactobacillus

Investigated the duration of storage of the consortium of strains of lactic acid bacteria in a liquid concentrate (table 3). As the sowing of the dose used, the consortium of strains of lactobacilli Lactobacillus acidophilus 57S (deposited in Vniigenetika in PMBC under No 5863), Lactobacillus plantarum P-75 (deposited in Vniigenetika in PMBC under No 3962); Lactobacillus casei SS (deposited in Vniigenetika in PMBC under No 5724) in the ratio 2:0,5:0,5. The fermentation is carried out at a temperature (39-40)°C for 4-5 hours before reaching the acidity of the finished product is not less than 100°So

A considerable time (up to 72 days) storage titer not less than 10 CFU/ml is associated with providing the initial acidity of the drug consortium of lactobacilli (120-140)°T, obtaining the original title of lactobacilli (not below 1010CFU/ml) by using the proposed dairy nutrient medium with the addition of bactopeptone and yeast extract.

Table 3
Data on cultivation consortium of bifidobacteria using the claimed nutrient medium and storing its biomass
Production is leaven Biomass lactobacilli-based consortium
Types of strains of lactic acid bacteria in the consortium 0,5:0,5:2 Nutrient medium Time of cultivation, hours Acidity, T° The titer (CFU/ml) GCB during storage Clot
1 day 72 days 1 day 60 days 72 days
In-5724 Claimed Wednesday 4,0. 140 160 Normal
In-3962 1·1010 6·109 2·109
In-5863
The same Wednesday - prototype 5,0 170 320 2,5·109 9,0·107 2,5·107 Normal

Example 5. Study of the retention of biomass consortium of strains of bifidobacteria in the liquid concentrate of bifidobacteria obtained using the claimed nutrient medium

Researched length is lnost storage consortium of strains of bifidobacteria in the liquid concentrate of bifidobacteria (table 4). As sowing dose of bifidobacteria using a consortium of strains of bacteria: Bifidobacterium bifidum 8-3, Bifidobacterium longum I-3, Bifidobacterium adolescentis B-1 in a ratio of 3:1:1.

Sowing dose of bifidobacteria contribute in the amount of 5.0-7.0% of the volume of the nutrient medium with the title of bifidobacteria not less than 109CFU/ml, culturing is carried out for a time sufficient for obtaining a concentrate of bifidobacteria with the biological titer of not less than (0,8-1,0)1011CFU/ml

A considerable time (up to 72 days) storage of liquid concentrate of bifidobacteria with a titer of not less than 1010CFU/ml is associated with providing the initial acidity of the drug consortium of bifidobacteria (140-145)°T, obtaining the original title of bifidobacteria (not below 1011CFU/ml).

Table 4
Data on cultivation consortium of bifidobacteria using the claimed nutrient medium and storing its biomass
Production leaven Liquid concentrate of bifidobacteria (ICB) based consortium
The composition of the proposed consortium The ratio of strains Time of cultivation, h Acidity, T° The titer (CFU/ml) GCB during storage Clot
1 day 72 days 1 day 60 days 72 days
l)B.bifidum 8-3 60 22 146 150 3·1011 1·1010 1·1010 Normal
2)B.longum (I-3) 20
3)B.adolescentis.-1 20
The same Wednesday - prototype 29 137 152 5·109 1·108 9·107 Normal

Thus, the technical result of the claimed invention confirms the creation of such a nourishing environment that provides opportunities for cultivation as bifidobacteria and lactobacilli for longer term storage (up to 72 hours or more) and higher titers biomass of bacteria during storage.

1. Dairy nutrient medium to obtain the biomass of bacteria-probiotics-containing base in the form of skim milk with a dry matter content of 13-14%, cysteine hydrochloric acid or ascorbic acid, hydrolyzed milk proteins, growth facto the s from yeast cells and sodium chloride, wherein the environment further comprises manganese sulfuric acid chetyrehpolnye and magnesium sulfuric acid as, as hydrolysate of milk proteins contains bactopeptone, and as growth factors from yeast cells purified yeast extract with the indicator amino nitrogen 2,1-2,8%, total protein not less than 3-4% in the following ratio of components of the nutrient medium, wt.%:

bactopeptone 5,0-7,0
cysteine hydrochloric acid
or ascorbic acid 0,001-0,002
sodium chloride 0,03-0,05
manganese sulfuric acid chetyrehpolnye 0,001-0,005
magnesium sulfuric acid as 0,01-0,02

purified yeast extract with

indicator
amino nitrogen 2,1-2,8%
total protein not less than 3-4% 1,5-2,0
skim milk with content
the dry residue 13-14% the rest is up to 100%

2. Dairy nutrient medium according to claim 1, characterized in that skim milk contains varnish the RAM in an amount of not more than 15%.

 

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