Food Science of Animal Resources (한국축산식품학회지)

Korean Society for Food Science of Animal Resources (한국축산식품학회)
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Isolation and Partial Characterization of Isoflavone Transforming Lactobacillus plantarum YS712 for Potential Probiotic Use

Isoflavone 비배당화 및 항산화 활성을 지닌 Lactobacillus plantarum YS712의 선발

  • Published : 2009.10.31
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Abstract

Lactic acid bacteria (LAB) are typical probiotic microbes that are used in various industries including fermented foods, feed additives, and pharmaceuticals. The purpose of this study was to compare the ability of isoflavone biotransformation and antioxidative activity of 17 LAB. Six strains including the Lactobacillus species exhibited a 100% hydrolysis rate for daidzein during fermentation. The content of total genistein in soymilk fermented with these strains was $872-943\;{\mu}g/g$. The DPPH (1, 1-diphenyl-2-picrylhydrazyl) radical scavenging ability of the LAB was widely variable and ranged from 23-78%. A selected strain was isolated from kimchi and the strain was identified as Lactobacillus plantarum ssp. through the API carbohydrate fermentation pattern and 16S rDNA profile. The strain exhibited excellent acid tolerance in an artificial gastric solution. L. plantarum YS712 showed high $\beta$-glucosidase activity in fermentation. The concentration of genistein and daidzein in soymilk fermented with L. plantarum YS712 increased from 3.64 to $917.3\;{\mu}g/g$ and from 58.18 to $1062.17\;{\mu}g/g$, respectively. These results demonstrate the potential of L. plantarum YS712 as a probiotic culture that can be utilized in the manufacturing of fermentation foods and dietary supplements.

발효유제품, 김치, 및 신생아 분변 등에서 유산균을 분리하여 isoflavone 전환 능력을 평가하였다. 유산균 중 높은 수준의 $\beta$-glucosidase 활성을 보인 균주는 Enterococcus sp. 77, L. paracasei, Lactobacillus sp. 712, L. brevis ATCC 8287, Lactococcus sp. KU107, L. acidophilus KCNU, L. plantarum L155 등으로 나타났다. 이들 유산균에 대하여 유당 발효성을 평가하여 가장 우수한 유산균을 선발하여 API, 16S rDNA를 분석한 결과 Lactobacillus plantarum으로 동정되었으며 이 활성 유산균을 Lactobacillus plantarum YS712로 명명하였다. Lactobacillus plantarum YS712는 pH 2.5에서도 약 50% 이상의 강한 생존율을 보였으며 DPPH 라디칼 소거능도 95.8%로, 선발된 유산균 중 가장 높은 라디칼 소거능을 나타내었다. 이로써 Lactobacillus plantarum YS712는 발효식품 및 유제품에 다양하게 이용할 가치가 있다고 판단된다.

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References

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