KR101703989B1 - Cheunggukjang Using Lactobacillus acidophilus with Increased Isoflavones and Exopolysaccharides and the Method of Making the Same - Google Patents

Abstract

The present invention relates to Lactobacillus acidophilus or Lactobacillus lambosus, The present invention relates to a soybean paste, a soybean paste, a soybean paste, and a soybean paste used as a seed germ, and a method for producing the soybean paste, and more particularly to a soybean paste prepared by using the seed germ as described above to thereby increase the content of non- glycosylated isoflavone and polysaccharide .
The present invention relates to the use of Lactobacillus acidophilus KCTC 3925, Lactobacillus rhamnosus KCTC 3929, L. mesenteroides Gene Bank (AY675249) or Bifidobacterium longum (B. longum KCTC 5734), non-glycosylated isoflavones fermented using the same and fermented by using the same, and a preparation method thereof.

Description

TECHNICAL FIELD The present invention relates to a method for producing Lactobacillus acidophilus with increased isoflavones and polysaccharides by Lactobacillus acidophilus,

The present invention relates to Lactobacillus acidophilus or Lactobacillus lambosus, The present invention relates to a soybean paste, a soybean paste, a soybean paste, and a soybean paste used as a seed germ, and a method for producing the soybean paste, and more particularly to a soybean paste prepared by using the seed germ as described above to thereby increase the content of non- glycosylated isoflavone and polysaccharide .

Miso uses soy, salt, and water as its main ingredients, and is classified into factory type miso and traditional miso depending on the manufacturing method. Traditional soybean paste production method is divided into preparation, washing, immersion, meju production, fermentation, salt water addition, aging and packaging process of raw soybean, and fermentation and aging process usually takes 2-3 years et al., 2000, Jo et al., 2011). In the traditional soybean paste, during the prolonged fermentation period, in addition to the positive effects such as the increase of non - glycosyl isoflavone content, the increase of antioxidant power and the decomposition of soybean carbohydrate and protein due to the separation of sugar from isoflavones, , And increased manufacturing costs due to prolonged aging (Park et al., 2000, Jo et al., 2011). Factory soybean paste is fermented and aged for several months under controlled fermentation conditions by inoculating seeds. Chungkookjang is fermented for 2 ~ 3 days by using Bacillus subtilis as the main raw material with soybean and water as the main raw material without added salt. It is kept in cold or frozen condition due to low salt concentration due to low salt concentration.

Lactic acid bacteria are gram-positive bacteria that are easy to grow under anaerobic or mild conditions, and Enterococcus Lactobacillus genus, Leuconostoc Genus, Pediococcus Genus Streptococcus And the like. Depending on the type of lactic acid bacteria, a large amount of lactic acid is produced by metabolizing a carbon source, or lactic acid and acetic acid are produced together.

On the other hand, Bifidobacterium spp. Produces both lactic acid and acetic acid by the bifidus pathway. These microorganisms produce organic acids that increase the concentration of [H ⁺ ] ions in the culture and change the pH to acidic. Lactic acid bacteria are widely used for fermentation of vegetables, grains, meat, milk and the like, and thus lactic acid bacteria are widely used for the production of kimchi, shaurus crowth, yogurt, takju, and soy sauce (miso, soy sauce, chungkukjang, .

On the other hand, bifidobacteria are intestinal bacteria and Bifidobacterium bifidum , B. longum , and B. breve are found mainly in infant feces. In adults, these three types of bifidobacteria are low, and Bifidobacterium Adolescentis is found as a major enteric bifidus in adults. B. bifidum , B. longum , and B. breve , isolated from infant feces, are added to various dairy products to increase the fermentation efficacy.

Isoflavone is a phytoestrogen found in plants such as soybean and oyster. It has an inhibitory effect on breast cancer, colon cancer and uterine cancer when it is consumed for a long time from adolescence period. In addition, it has an effect of preventing osteoporosis, Are known.

Soy isoflavones contain three types of aglycone and non-glycoside forms such as daidzein, glycitein, and genistein, and glucose, acetylglucoside, A total of 12 different isoflavone structures are identified, including glycoside-linked glycoside-linked glycosides (Shigemistu et al., 1991).

In soybeans before processing into food, isoflavones are mostly present as glycoside isoflavones and are converted to non-glycosylated isoflavones by enzymatic degradation by beta-glucosidase or acid hydrolysis, (Izumi et al., 2000, Setchell & Cassidy 1999).

In addition to lactic acid, acetic acid and ethanol, some lactic acid bacteria biosynthesize viscous exopolysaccharide (EPS) into the metabolites of lactic acid bacteria. In this study, we investigated the effects of lactic acid bacteria on microbial biosynthesis of microorganisms. In this study, we investigated the effect of microbial biosynthesis on microbial biosynthesis of lactic acid bacteria (Jeans et al., 1957; Kimmel et al., 1998; Yun et al., 2013).

(Kimmel et al., 1998), there has been a growing interest in the physiological efficacy of polysaccharides derived from bacteria outside the body (Kim et al., 1998) .

In the present invention, by comparing the viability of soybean paste with different salt concentrations of commercial lactobacillus and bifidus bacteria, the enzyme activity converting isoflavone into non-glycosylated form and the ability to produce polysaccharide from the extracellular polysaccharide, the non-glycosylated isoflavone Lactobacillus acidophilus ( Lactobacillus) producing an extracellular polysaccharide acidophilus KCTC 3925) or Lactobacillus < RTI ID = 0.0 > rhamnosus KCTC 3929) as the seeds.

In order to solve the problems of the prior art as described above, the present invention relates to a method for producing Lactobacillus acidophilus Lactobacillus acidophilus KCTC 3925) or Lactobacillus < RTI ID = 0.0 > rhamnosus KCTC 3929), and the like.

In addition, the present invention is a Lactobacillus know pillar's (Lactobacillus acidophilus KCTC 3925) or Lactobacillus < RTI ID = 0.0 > rhamnosus KCTC 3929) and a process for producing the same.

In order to achieve the above object, the present invention provides a method for producing Lactobacillus acidophilus KCTC 3925, Lactobacillus rhamnosus KCTC 3929, Leuconostoc mesenteroides , Gene Bank: AY675249) or Bifidobacterium longum ( B. longum KCTC 5734) containing isoflavones and extracellular polysaccharides are provided to provide an intestinal fermentation strain with increased intestinal flora.

In addition, the present invention provides a soybean fermented with an increased amount of isoflavones and extracellular polysaccharides including Lactobacillus acidophilus KCTC 3925 and Lactobacillus rhamnosus KCTC 3929.

In addition, the present invention relates to a method for producing an ordinary soy sauce, comprising the steps of: 1) a step of washing soy sauce and immersing it in soy sauce; The second step of primary fermentation of soybeans; And Lactobacillus acidophilus KCTC 3925, Lactobacillus rhamnosus KCTC 3929, Leuconostoc mesenteroides ( Gene Bank: AY675249), or Lactobacillus spp. And B. three long brewer's bacterium including one or more of B. longum KCTC 5734, which is further fermented for 2 to 3 days in addition to sugar, The present invention provides a method for producing a non-glycosylated isoflavone and an extracellular polysaccharide in an increased amount.

In addition, the isoflavone and the extracellular polysaccharide of the present invention can be produced by a method comprising the steps of: (a) culturing Lactobacillus acidophilus KCTC 3925 or Lactobacillus rhamnosus KCTC 3929 .

In order to utilize lactic acid bacteria and bifidobacteria as starter bacteria in the preparation of miso, β- glucosidase activity to convert glycosyl isoflavone to non-glycosyl isoflavone, bacterial viability in sterilized soybean paste with different salt concentration, exopolysaccharide, EPS) were compared. For the measurement of β- glucosidase activity, glycoside isoflavones were added to doenjang, and lactic acid bacteria and bifidobacteria were inoculated and cultured at 37 ° C.

The conversion rates of the samples cultured for 120 hours were 5.5 ~ 60.2%, and the strains showing the highest conversion rate were Lactobacillus acidophilus KCTC 3925, B. longum KCTC 5734, Lactobacillus rhamnosus KCTC 3929 were 28.6% and 17.6%, respectively. Enterococcus faecium KCTC 13410 and Pediococcus Conversion rates of pentosaceus KCTC 10297BP were as low as 5.5% and 7.1%. Lactobacillus Acidophilus KCTC 3925 did not detect viable bacteria at a salt concentration of 13%, and the viable cell count was 2.2 × 10 ⁸ CFU / g at a salt concentration of 1.5%. Enterococcus faecium KCTC 13410 was high in salt survival among the bacteria used, and the viable cell count was 3.8 × 10 ⁷ CFU / g at a salt concentration of 13%.

B. longum KCTC 5734, Lactobacillus acidophilus KCTC 3925, Lactobacillus rhamnosus KCTC 3929, Pediococcus pentosaceus KCTC 10297BP was relatively low in salt viability. In the case of Exopolysaccharide, lactic acid bacteria and bifidobacteria were inoculated on the MRS medium prepared by adding 1% sucrose, and 5 kinds of lactic acid bacteria and 3 kinds of bifidobacteria were inoculated with Leuconostoc mesenteroides (Gene Bank: AY675249), Lactobacillus acidophilus KCTC 3925, Lactobacillus rhamnosus KCTC 3929 produced a viscous polysaccharide.

In conclusion, Lactobacillus acidophilus KCTC 3925, which has low salt viability but high β -glucosidase activity, is expected to be applicable to the production of chongkukjang .

In summary, in the present invention, Lactobacillus acidophilus KCTC 3925, L. rhamnosus KCTC 3929, Leuconostoc cellulase, mesenteroides , Gene Bank: AY675249) is used as a seed germ, it has an effect of supplementing a polysaccharide mainly composed of a glucose polymer in addition to a fructose polymer produced in a conventional chungkukjang.

In addition, Lactobacillus know also the filler's (L. acidophilus KCTC 3925 strains), Lactobacillus ramno suspension (L. rhamnosus strains KCTC 3929), Bifidobacterium ronggum the seed (B. longum KCTC 5734 strains) in the low-salt soy sauce produced , The glycoside isoflavones are metabolized into nonisaccharide isoflavones, which are easily absorbed in the body. Thus, the functionality of nonisaccharide isoflavones is improved in chongkukjang, low salt miso and low salt soy sauce.

The results of the present invention show that the conventional glycemic fermentation under non-regulated fermentation conditions progresses slowly while the non-glycosylated isoflavone metabolism of glycoside isoflavone proceeds, whereas the L. acidophilus KCTC 3925 having beta-glucosidase activity , L. rhamnosus KCTC 3929 or B. longum KCTC 5734 in a controlled fermentation can increase the non-glycosyl isoflavone content in a short time. In addition, the storage stability of the product can be improved by the production of lactic acid due to lactic acid fermentation.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a process for producing chungkukjang in which the unglycosylated and glucan components of the present invention are enhanced.
Figure 2 shows HPLC chromatograms of enzymatically degraded L. acidophilus KCTC 3925-derived extracellular polysaccharide. (A) an extracellular polysaccharide not treated with an enzyme, (B) an extracellular polysaccharide treated with a glucanase, (C) an extracellular polysaccharide treated with a fluorocarbonase.

The present invention relates to Lactobacillus acidophilus or Lactobacillus lambosus, The present invention relates to a soybean paste, a soybean paste, a soybean paste, and a soybean paste used as a seed germ, and a method for producing the soybean paste, and more particularly to a soybean paste prepared by using the seed germ as described above to thereby increase the content of non- glycosylated isoflavone and polysaccharide .

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.

< Example  1>: Materials and methods

1-1. material

Daidzein, daidzin, genistein, genistin, glycitein and glycitin were purchased from Fujicco Co., Ltd. (Kobe, Japan) and dissolved in dimethyl sulfoxide (DMSO, Sigma-aldrich, St. Louis, Mo., USA) Respectively. Sigma-aldrich products were used in 35% hydrochloric acid (HCl), sodium hydroxide (NaOH), and 99.9% ACS grade ethanol.

1.2 Strain and culture method

The lactic acid bacteria used in the experiment were Lactobacillus acidophilus KCTC 3925, Leuconostoc mesenteroides (Gene Bank: AY675249)), Lactobacillus rhamnosus KCTC 3929), Pediococcus pentosaceus KCTC 10297BP), Enterococcus faecium KCTC 13410, and Bifidobacterium bifidum KCTC 5082, Bifidobacterium longum KCTC 5734, Bifidobacterium breve KCTC 5081 including the three kinds of cells Biotech (sf, Korea) was used in when supplied, culture of these lactobacillus MRS broth (Difco, St. Louis, MO, USA), 2 ~ 3 ilgan static culture at 37 ℃ using Respectively.

1.3 Production of fermented soybean paste using lactic acid bacteria and bifidus bacteria

The soybean paste used in the experiment was aged at room temperature for 3 months from September 2011 to February 2012, except for the liquid soy sauce, which was subjected to bean selection, increase, meju production, salt water addition and solid / liquid separation processes . 0.425 g (0.5 × 10 ¹⁰ to 1.0 × 10 ¹⁰ CFU / g) of these lactic acid bacteria were added to 25 g of aged doenjang for 3 months, and the mixture was completely mixed and then the lid was closed and cultured at 25 ° C.

1.4 pH  Measure

10 g of doenjang samples were mixed with 9 mL of distilled water, vortexed for 30 seconds, allowed to settle, and the supernatant was taken. The supernatant was measured with a pH meter (model 725P, Istek, Seoul, Korea).

1.5 Salinity measurement

2 g of doenjang samples were dispersed in sterilized distilled water (25 mL). After Centrifuge (5810R, Eppendorf, Hamburg, Germany ) 10 bungan centrifugal filter paper and the supernatant was separated from the 2,465 × g to (Whatman N0 5;. Whatman International Ltd., Maidstone, UK) as AgNO ₃ was 0.05 N in this filtration And the salinity of doenjang was determined. The experiment was repeated 3 times and the results were expressed as mean and standard deviation.

1.6 In fermented soybean paste with different salt concentration, commercial lactobacillus and bifidus Survival  Confirm

0, 1, 4, and 9 mL of sterilized distilled water were added to a 20-mL volumetric flask containing 1 g of miso sample and dispersed evenly for 30 seconds. A 20-mL volumetric flask containing the sample was sterilized at 121 ^° C for 15 minutes, cooled and incubated with 1% (vol / vol) of lactic acid bacteria and bifidobacteria (A ₆₀₀ nm = 1.1-2.0) ), Dispersed evenly, and cultured at 37 DEG C for 24 hours. The cultured doenjang sample was dispersed for about 30 seconds and precipitated naturally. The supernatant was diluted by 10-fold serial dilution method and applied to the surface of MRS-agar medium (DIFCO, Sparks, MD, USA) And cultured for 24 hours in an anaerobic manner to measure viable cell count.

1.7 Isoflavone Content Analysis

Analysis of isoflavone composition and content of doenjang containing artificially added isoflavones was conducted by modifying the method of Kim et al., (2003). 0.43 g of isoflavone (Soyavone EX 30, ConProducts International, Seoul, Korea) and 10 mL of sterilized distilled water were added to about 2.5 g of the sterilized soybean paste sample, and lactic acid bacteria or bifidus bacteria 1% (vol / vol), and cultured at 37 ° C for 120 hours. After incubation, the aglycone content was determined by adding 9 times 80% ethanol to the fermented soybean fermented soybean lactic acid fermented soybeans, followed by vortexing for 30 seconds for 24 hours.

In order to measure total isoflavone content such as aglycone, glycoside, acetylglucoside, and malonylglucoside, 10 mL of 2N HCl was added to the fermented sample and refluxed for 1 hour. After acid hydrolysis, 10N NaOH was added to neutralize the pH between 6.5 and 7.5, followed by extraction with 340 mL of 80% ethanol. The supernatant of the extract was collected and filtered through a 0.45 μm filter membrane. The filtrate was applied to an Agilent 1200 HPLC equipped with an Eclipse XDB-C18 column (4.6 x 250 mm ID, Agilent Technologieo, Santa Clara, mu] L, detected with a UV detector at 254 nm, and quantitatively analyzed using an area.

The mobile phase was used with the following composition at a flow rate of 1.2 mL / min using mobile phase A (0.1% acetic acid in H ₂ O) and mobile phase B (0.1% acetic acid in acetonitrile). The mixing ratios of mobile phase A and mobile phase B were 93: 7, 93: 7, 85:15, 80:20, and 75:20 at time 0, 25, 50, 55, 70, 75, : 25, 75:25, 65:30, 65:30. The results were corrected by taking the dilution ratio into account. The conversion efficiency indicates the content of unglycoside isoflavone versus the total isoflavone content and was determined by the following equation.

Conversion rate = (non-glycosyl isoflavone content measured without acid hydrolysis process / non-glycosyl isoflavone content measured after acid hydrolysis process) × 100.

1.8 Out  Polysaccharide measurement

5 strains of lactic acid bacteria and 3 strains of bifidobacteria were inoculated in a MRS solid medium supplemented with 1% of sugar, cultured at 37 ° C for 48 hours, cultured for 48 hours, and viscous material was formed on the surface of the culture medium. And it was presumed that the polysaccharide-producing bacteria were mainly exogenous. The recovered viscous material was centrifuged (1,000 rpm, 2 min, 4 ° C) to recover 6 mL of the supernatant (viscous substance), followed by the addition of 2 volumes of 100% ethanol, vortexing for 30 seconds, 4,000 rpm, 10 min, 4 캜) to recover the precipitate (slurry). The recovered precipitate was dried and then the dry weight was measured.

In order to confirm the compositional composition of the recovered precipitate, 6 mL of sterilized water was added to the precipitate and hydrated. 1) Quantitative analysis by HPLC without enzyme treatment, 2) Quantitative analysis by HPLC after treatment with glucanase, 3) Quantitative analysis by HPLC after carbohydrase treatment was carried out. For the preparation of the sample, 10 μL of invertase (Novozymes, Begsvaerd, Denmark) was added to the hydrated sample (2 mL) and reacted at 30 ^° C for 16 hours. Glucanase treatment For the preparation of samples, 17 μL of Termamyl 120L (Novozymes), a liquefying enzyme, was added to 2 mL of hydrated samples and treated at 80 ° C for 2 hours. After cooling to 37 ° C, Neutrase 0.8L (Novozymes) (AMG 300L, Novozymes) was added to the reaction mixture and the mixture was treated for 2 hours.

1.9 HPLC ( High - performance liquid chromatography ) Analysis of sugar composition

Samples with different three kinds of enzyme treatment conditions were passed through a 0.45-μm filter membrane (DISMIC-13HP, Toyo Roshi Kaisha, Tokyo, Japan), and the filtrate was applied on an Agilent 1200 HPLC equipped with a Kromasil 100-10 NH ₂ column (Agilent Technologies, Santa Clara, Calif., USA). For the HPLC conditions, 20 μL of the sample was injected, and the mobile phase was a mixture of 75% acetonitrile and 25% water. The flow rate was 1 mL / min and the RI detector was used at 30 ° C.

1.10 Statistics Processing

Statistical analysis was performed using a one-way analysis of variance (ANOVA) method (Albright et al., 1999).

< Example  2>: A fermented soybean fermented with added glyphosate isoflavone pH

2.1 Doenjang prepared by lactic acid bacteria in soybean paste pH

Table 1 shows the results of measuring the pH of the fermentation broth obtained by adding 5 kinds of lactic acid bacteria to doenjang added glyphosate-type isoflavone and culturing at 37 ° C for 120 hours. The pH of the doenjang sample without added lactic acid bacteria was 5.04, while the pH of the doenjang sample with 5 kinds of lactic acid bacteria added ranged from 4.01 to 4.33, indicating that organic acids were produced in all the doenjang samples added with lactic acid bacteria.

 PH of doenjang samples cultured with lactic acid bacteria on doenjang supplemented with glycoside isoflavones Name of microorganism strain added to doenjang pH No added lactic acid bacteria 5.04 + 0.01 ^a Lactobacillus acidophilus KCTC 3925 4.29 ± 0.06 ^b Leuconostoc mesenteroides (Gene Bank: AY675249) 4.17 ± 0.14 ^b Lactobacillus rhamnosus KCTC 3929 4.09 ± 0.08 ^b Pediococcus pentosaceus KCTC 10297BP 4.01 ± 0.05 ^b Enterococcus faecium KCTC 13410 4.33 ± 0.03 ^b

2.2 pH of doenjang samples cultured as bifidobacteria in doenjang supplemented with glycoside isoflavones

Table 3 shows the results of measuring the pH of the fermentation broth obtained by adding three kinds of bifidobacteria to doenjang added glyphosate-type isoflavone and culturing at 37 ° C for 120 hours. The pH of the doenjang sample without added bifidobacteria was 5.04, while the pH of the doenjang samples with three kinds of bifidobacteria was 4.04 ~ 4.85. The addition of bifidobacteria stimulated the production of additional organic acids in all the doenjang samples.

The pH of doenjang samples cultured as bifidobacteria in doenjang supplemented with glycoside isoflavones Name of microorganism strain added to doenjang pH No added lactic acid bacteria 5.04 + 0.01 ^a Bifidobacterium bifidum KCTC 5082 ¹⁾ 4.85 ± 0.43 ^ab Bifidobacterium longum KCTC 5734 4.60 ± 0.38 ^ab Bifidobacterium breve KCTC 5081 4.04 0.03 ^b

< Example  3>: Doenjang's In salt concentration  Growth of lactic acid bacteria

The concentration of salt in miso samples was 13.2%. To investigate the effect of salt concentration on the growth of lactic acid bacteria used as seeds, the samples of doenjang were diluted 0, 2, 5, and 10 times with sterilized water, After cultivation using the growth medium, viable cell counts were measured in the MRS solid medium (Table 3).

The number of live bacteria of 5 kinds of lactic acid bacteria was inversely proportional to the salt concentration, but the degree of inhibition by salt was different for each strain. The growth of L. acidophilus KCTC 3925 was higher in the order of E. faecium KCTC 13410, L. mesenteroides strain, P. pentosaceus KCTC 10297BR and L. rhamnosus KCTC 3929 in the undiluted samples (salt concentration 13.2%). Growth inhibition was the highest. In the case of L. acidophilus KCTC 3925, the salt concentration was 1.32, 2.64 and 6.6%, respectively, and 2.3 × ^{10 8} , 7.9 × ^{10 7} and 3.6 × 10 ⁵ CFU / 99.84%, indicating that this strain is advantageous for the production of cheonggukjang, which has relatively low salt concentration, than soybean products with high salt concentration such as miso or soy sauce.

Number of lactic acid bacteria (CFU / g miso) measured after incubation in doenjang diluted with doenjang Lactic acid bacteria added to doenjang Salt concentration (%) 1.32 2.64 6.6 13.2 L. acidophilus KCTC 3925 2.3 Χ10 ⁸ 7.9Χ10 ⁷ 3.6X10 ⁵ Not detected L. mesenteroides (Gene Bank: AY675249) 6.8Χ10 ⁸ 2.4 Χ10 ⁸ 6.5 X 10 ⁷ 1.1Χ10 ⁷ L. rhamnosus KCTC 3929 4.5 X ^{10 8} 2.3 Χ10 ⁸ 2.3Χ10 ⁷ 8.4Χ10 ⁵ P. pentosaceus KCTC 10297BP 5.9Χ10 ⁸ 3.6Χ10 ⁸ 9.3Χ10 ⁷ 1.0 Χ10 ⁶ E. faecium KCTC 13410 9.5Χ10 ⁸ 5.4Χ10 ⁸ 1.2 Χ10 ⁸ 9.3Χ10 ⁷

< Example  4>: miso In salt concentration  Bifidus

Three kinds of bifidobacteria were inoculated into doenjang samples prepared by a method similar to that of Example 3, and the number of viable cells was measured in a MRS solid medium (Table 4). The viable cell counts of the three bifidobacteria were inversely proportional to the salt concentration, but the degree of inhibition by the salt was different for each strain. The growth of B. breve KCTC 5081 was the highest and the growth of B. bifidum KCTC 5082 was the lowest in undiluted samples of doenjang (salt concentration 13.2%).

The number of bifidobacterial cells (CFU / g miso) measured after incubation in doenjang diluted with doenjang Bifidobacteria added to doenjang Salt concentration (%) 1.32 2.64 6.6 13.2 B. bifidum KCTC 5082 4.3 Χ10 ⁸ 4.2Χ10 ⁸ 1.2Χ10 ⁵ Not detected B. longum KCTC 5734 4.4 X ^{10 8} 3.4 X ^{10 8} 1.3 Χ10 ⁸ 1.7 X 10 ⁶ B. breve KCTC 5081 5.2X10 ⁸ 3.4 X ^{10 8} 4.3 X 10 ⁷ 6.2 Χ10 ⁷

< Example  5>: Metabolism of Doenjang Added Glycoside Isoflavone by Lactic Acid Bacteria

In order to confirm the presence of beta-glucosidase activity of the 5 kinds of lactic acid bacteria, soybean paste was sterilized in consideration of the result of previous studies that isoflavone is mostly present in non-glycosides in fermented soybean paste, Flavone was added. Most of the added isoflavones were glycosides and a small amount of nonisaccharide isoflavones were present. The total unglycosylated isoflavone content before fermentation was 341 mg / kg and the difference was 348 mg / kg after fermentation (Table 5).

Lactic acid bacteria L. acidophilus KCTC 3925, L. mesenteroides (Gene Bank: AY675249) and L. rhamnosus KCTC 3929 (p <0.01) increased the content of unglycosylated isoflavones (daidzein, glycitein and genistein) in a time-dependent manner, but not in P. pentosaceus KCTC 10297BP or E. faecium There was no significant difference in the content of non - glycosylated isoflavones when KCTC 13410 was inoculated.

In the inoculation of L. acidophilus KCTC 3925, glycitein and genistein contents of non-glycosylated isoflavones were 152.7, 90.9 and 98.7 mg / kg before fermentation, respectively. However, after 60 hours fermentation, 767.7, 156.3 and 289.3 mg / kg, and after 120 hours of fermentation were 3017.7, 576.7 and 663.7 mg / kg, respectively. L. acidophilus KCTC 3925, L. mesenteroides (Gene Bank: AY675249), L. rhamnosus KCTC 3929, P. pentosaceus KCTC 10297BP and E. faecium KCTC The addition of L. acidophilus KCTC 3925 to S. cerevisiae resulted in the conversion of glycoside isoflavones to non-glycosylated isoflavones at a high rate of 4.9, 60.2, 9.5, 17.6, 7.1 and 5.5% 6).
Considering that fermentation of fermented soybean paste and soy sauce fermentation takes about several months to two years and fermentation time and aging time are required, the results of 60 hours and 120 hours applied in this study are applied to the production of actual soy sauce Indicating that the isoglycosylated isoflavone content can be increased in an additional short time.

delete

The concentration of non - glycosylated isoflavone in the incubation period of doenjang samples inoculated with lactic acid bacteria in doenjang supplemented with glycoside isoflavones Strain
Non-glycoside
Isoflavone Non-glycoside isoflavone content (mg / kg) p-value
0 hours 60 hours 120 hours No additives

Daid Jane 152.7 ± 4.7 147.7 ± 9.6 156.7 ± 13.3 0.5660 Glycitein 90.0 ± 3.6 85.0 ± 4.0 86.7 ± 0.6 0.2175 Genistein 98.7 ± 4.7 93.0 + - 7.8 104.3 ± 15.4 0.4537 L. acidophilus KCTC 3925

Daid Jane 152.7 ± 4.7 ^b 767.7 ± 76.7 ^b 3017.7 ± 586.5 ^a 0.0001 Glycitein 90.0 ± 3.6 ^b 156.3 ± 20.5 ^b 576.7 ± 93.9 ^a 0.0001 Genistein 98.7 ± 4.7 ^c 289.3 ± 21.1 ^b 663.7 ± 34.3 ^a 0.0000 L. mesenteroides (Gene Bank: AY675249)

Daid Jane 152.7 ± 4.7 ^c 237.0 ± 13.8 ^b 343.3 ± 28.9 ^a 0.0001 Glycitein 90.0 ± 3.6 ^b 101.3 ± 3.8 ^ab 107.3 ± 5.5 ^a 0.0079 Genistein 98.7 ± 4.7 ^c 137.3 ± 4.0 ^b 219.7 ± 19.9 ^a 0.0000 L. rhamnosus KCTC 3929

Daid Jane 152.7 ± 4.7 ^c 474.0 + - 71.1 ^b 742.3 ± 9.0 ^a 0.0000 Glycitein 90.0 ± 3.6 ^c 110.3 + - 8.4 ^b 148.3 ± 1.5 ^a 0.0000 Genistein 98.7 ± 4.7 ^c 185.0 + - 24.0 ^b 354.7 ± 7.2 ^a 0.0000 P. pentosaceus KCTC 10297BP

Daid Jane 152.7 ± 4.7 261.0 + - 3.0 273.3 ± 111.9 0.1156 Glycitein 90.0 ± 3.6 97.7 ± 2.9 86.0 ± 33.3 0.7651 Genistein 98.7 ± 4.7 137.7 ± 2.9 145.3 ± 56.5 0.2516 E. faecium KCTC 13410

Daid Jane 152.7 ± 4.7 151.3 ± 5.1 185.0 ± 58.4 0.4394 Glycitein 90.0 ± 3.6 91.3 ± 4.6 91.0 + - 10.4 0.9704 Genistein 98.7 ± 4.7 100.3 ± 4.2 112.7 ± 22.1 0.4217

The content of non - glycosylated isoflavone in the incubation period of doenjang samples inoculated with Bifidobacterium in soybean fortified with glycoside isoflavones Strain Non-glycoside
Isoflavone Non-glycoside isoflavone content (mg / kg) p-value 0 hours 60 hours 120 hours B. bifidum KCTC 5082

Daid Jane 152.7 ± 4.7 152.0 ± 5.3 289.7 ± 143.2 0.1419 Glycitein 90.0 ± 3.6 89.0 ± 1.0 96.7 ± 12.7 0.4563 Genistein 98.7 ± 4.7 99.7 ± 6.0 151.0 + - 46.8 0.0944 B. longum KCTC 5734

Daid Jane 152.7 ± 4.7 ^c 609.3 + - 51.0 ^b 950.0 + - 165.9 ^a 0.0002 Glycitein 90.0 ± 3.6 ^b 120.0 + - 3.0 ^a 133.3 ± 15.0 ^a 0.0030 Genistein 98.7 ± 4.7 ^b 256.0 ± 16.5 ^a 281.0 ± 39.4 ^a 0.0002 B. breve KCTC 5081

Daid Jane 152.7 ± 4.7 ^c 276.3 ± 32.3 ^b 425.7 ± 35.2 ^a 0.0001 Glycitein 90.0 ± 3.6 ^b 96.0 ± 3.6 ^b 117.3 ± 7.6 ^a 0.0017 Genistein 98.7 ± 4.7 ^b 139.3 ± 9.3 ^b 239.3 ± 29.3 ^a 0.0002

< Example  6>: Metabolism by Bifidobacteria of Doenjang Added Glycoside Isoflavones

In order to confirm the presence of beta-glucosidase activity of the three bifidobacteria, miso samples were prepared in the same manner as in Example 5. Bifidobacteria were added to B. longum KCTC 5734 and B . Aglycone a time-dependent manner in breve strains KCTC 5081 isoflavones (daidzein, glycitein, genistein) content was increased (p <0.01). When B. breve KCTC 5081 was used as an inoculum, the contents of daidzein, glycitein and genistein were 276.3, 96.0 and 139.3 mg / kg after 60 hours fermentation and 425.7, 117.3 and 239.3 mg / kg respectively after 120 hours fermentation . When B. longum KCTC 5734 was used as a seed strain, the amounts of daidzein, glycitein and genistein were 609.3, 120.0 and 256.0 mg / kg, respectively, after 60 hours of fermentation, and 950.0, 133.3 and 281.0 mg / kg (Table 7).

When the conversion rate was compared based on 120 hour culture, 28.6% of B. longum KCTC 5734 added bacteria showed beta - glucosidase activity in the doenjang sample added with B. longum KCTC 5734 as the seed bacterium among the three bifidobacteria (Table 8). Bifidobacterium animalis , B. longum and B. pseudolongum have been reported to have beta-glucosidase activity using soybean milk as a microbial culture medium (Tsangalis et al., 2002) There is a big difference between used miso and used materials.

After 120 hours incubation of doenjang prepared with lactic acid bacteria in doenjang fortified with glycoside isoflavones, Strain Conversion yield (%) Daid Jane Glycitein Genistein synthesis No additives 3.6 ± 0.3 ^b 4.1 ± 0.2 ^b 16.1 ± 2.4 ^d 4.9 ± 0.4 ^b L. acidophilus KCTC 3925 70.0 ± 13.6 ^a 27.3 ± 1.3 ^a 102.5 ± 5.3 ^a 60.2 ± 10.1 ^a L. mesenteroides
(Gene Bank: AY675249) 8.0 ± 0.7 ^b 5.1 ± 0.2 ^b 33.9 ± 3.0 ^c 9.5 ± 0.8 ^b L. rhamnosus KCTC 3929 17.2 ± 0.2 ^b 7.0 ± 0.3 ^b 54.8 ± 1.1 ^b 17.6 ± 0.2 ^b P. pentosaceus KCTC 10297BP 6.3 ± 2.6 ^b 4.1 ± 0.2 ^b 22.4 ± 8.7 ^cd 7.1 ± 2.8 ^b E. faecium KCTC 13410 4.3 ± 1.3 ^b 4.3 ± 0.2 ^b 17.4 ± 3.4 ^d 5.5 ± 1.3 ^b p-value 0.0000 0.0000 0.0000 0.0000

After 120 hours incubation of doenjang samples inoculated with Bifidobacterium glutinosa in soy sauce fortified with glycoside isoflavones, the non - glycosylated isoflavone conversion yield Strain Conversion yield (%) Daid Jane Glycitein Genistein synthesis B. bifidum KCTC 5082 10.2 ± 5.1 ^b 6.7 ± 0.9 ^bc 30.4 ± 9.4 ^bc 11.3 ± 4.2 ^b B. longum KCTC 5734 33.5 ± 5.9 ^a 9.3 ± 1.1 ^a 56.5 ± 7.9 ^a 28.6 ± 4.6 ^a B. breve KCTC 5081 15.0 ± 1.2 ^b 8.1 ± 0.5 ^ab 48.2 ± 5.9 ^ab 16.4 ± 1.5 ^b p-value 0.0001 0.0026 0.0009 0.0002

< Example  7>: by lactic acid bacteria and bifidobacteria Out  Polysaccharide (EPS) Production capacity  compare

Five lactic acid bacteria and three bifidobacteria were inoculated into the solid medium of MRS supplemented with sugar to inoculate 5 kinds of lactic acid bacteria and 3 kinds of bifidobacteria to obtain the extracellular polysaccharide. The strain producing the substance was examined. Among the eight strains, L. mesenteroides (Gene Bank: AY675249), L. acidophilus KCTC 3925 and L. rhamnosus KCTC 3929 were found to produce viscous substances.

In the case of L. mesenteroides (Gene Bank: AY675249), L. acidophilus KCTC 3925 and L. rhamnosus KCTC 3929 when 6 mL of the viscous substance recovered from the surface of the solid medium was ethanol precipitated, 88, 77 and 119 mg Was obtained. In order to confirm the compositional composition of the recovered precipitate, 6 mL of sterilized water was added to the precipitate and hydrated. 1) Quantitative analysis by HPLC without enzyme treatment, 2) Quantitative analysis by HPLC after treatment with glucanase, 3) Quantitative analysis by HPLC after carbohydrase treatment was carried out.

In the samples without enzymatic treatment and with the fluorocarbonase treatment, no additional production of monosaccharides (glucose and fructose) was observed in all three samples, whereas in the samples treated with glucanase, disaccharides (maltose, 11.7 min.) and L. mesenteroides (Gene Bank increase the amount of the peak (peak), and no significant increase in the amount corresponding to the additional fructose monosaccharide of glucose (14.2 minutes): AY675249), L. acidophilus KCTC 3925, L. rhamnosus The extracellular polysaccharide produced in KCTC 3929 was found to be glucan composed of glucose (Fig. 2).

Chungkookjang forms a distinctive viscous substance, which consists of poly-glutamic acid and levan, a major polymer. According to this study, fermentation of conventional fermented chungkukjang or low salt fermented soybeans with one of these three kinds of lactic acid bacteria and addition of sugar and fermentation produces new glucan in these fermented soybeans.

The results of the present invention show that the conventional glycemic fermentation under non-regulated fermentation conditions progresses slowly while the non-glycosylated isoflavone metabolism of glycoside isoflavone proceeds, whereas the L. acidophilus KCTC 3925 having beta-glucosidase activity , L. rhamnosus KCTC 3929 or B. longum KCTC 5734 in a controlled fermentation can increase the non-glycosyl isoflavone content in a short time.

To summarize, in the present invention, L. acidophilus KCTC 3925, L. rhamnosus KCTC 3929, L. mesenteroides , Gene Bank: AY675249, Lactobacillus amyloliquefaciens, ) Is used as a seed, in addition to the fructose-containing polymer produced in the existing chungkukjang, a new supplement of a polysaccharide mainly composed of a glucose polymer occurs.

In addition, Lactobacillus know also the filler's (L. acidophilus KCTC 3925 strains), Lactobacillus ramno suspension (L. rhamnosus strains KCTC 3929), Bifidobacterium ronggum the seed (B. longum KCTC 5734 strains) in the low-salt soy sauce produced , The glycoside isoflavones are metabolized into nonisaccharide isoflavones, which are easily absorbed in the body. Thus, the functionality of nonisaccharide isoflavones is improved in chongkukjang, low salt miso and low salt soy sauce.

The embodiments presented above are illustrative and those skilled in the art will be able to make various modifications and alterations to the disclosed embodiments without departing from the technical spirit of the present invention. The scope of the present invention is not limited by these variations and modifications.

Claims (5)

The lactobacillus acidophilus filler having a salt concentration of 1.32 wt% to 6.6 wt%, characterized in that the non-glycosyl isoflavone and glucan are increased, including Lactobacillus acidophilus , Low - salt flours for survival of. delete In a conventional method for producing soy sauce,
Washing the soybeans to immerse them in a first step;
The second step of primary fermentation of soybeans; And
And 3) further fermenting the mixture for 2 to 3 days in addition to sugar by using Lactobacillus acidophilus as an inoculum. The method according to any one of claims 1 to 3, wherein the non-glycosylated isoflavone and glucan are increased Wherein the salt concentration is 1.32% by weight to 6.6% by weight based on the total weight of the Lactobacillus acidophilus strain. The method according to claim 3, wherein the sweet potato is a cheonggukjang.

delete

Images