Hydrolysis of soybean isoflavone glucosides by lactic acid bacteria |
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Authors: | Yeon-Bae Choi Kang-Sung Kim Joon-Shick Rhee |
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Affiliation: | (1) Department of Food and Biotechnology, Chungkang College of Cultural Industries, Icheon, 467-744, Korea |
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Abstract: | Lactobacillus delbrueckii subsp. delbrueckii KCTC 1047, grown in de Man, Rogosa and Sharpe (MRS) or soymilk media, completely hydrolyzed the isoflavone glucosides, genistin and daidzin at 50 g ml–1, into their respective aglycones, genistein and daidzein within 30 min. Other lactic acid bacteria did not produce -glucosidase, the enzyme responsible for the hydrolysis of isoflavone glucosides, when cultured in MRS medium. Glucoside-hydrolyzing activity was induced in some lactic acid bacteria when cultured in soymilk medium. These strains hydrolyzed 70–80% of genistin into genistein and 25–40% of daidzin into daidzein. |
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Keywords: | daidzin genistin isoflavone glucoside lactic acid bacteria |
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