Enrichment of bioactive isoflavones in soymilk fermented with β-glucosidase-producing lactic acid bacteria |
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Affiliation: | 1. Food Function Research Division, Korea Food Research Institute, San 46-1, Backhyun-Dong, Bundang-Ku, Seongnam-City, Gyeonggi-Do 463-746, Republic of Korea;2. Department of Food Science, Center for Advanced Food Technology, Rutgers, The State University of New Jersey, 65 Dudley Road, New Brunswick, NJ 08901-8520, USA |
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Abstract: | This study was undertaken to investigate the possible application of β-glucosidase-producing lactic acid bacteria as a functional starter cultures to obtain the bioactive isoflavones, genistein and daidzein, in fermented soymilk. Four strains – Lactobacillus plantarum KFRI 00144, Lactobacillus delbrueckii subsp. lactis KFRI 01181, Bifidobacterium breve K-101 and Bifidobacterium thermophilum KFRI 00748 – among the 31 lactic acid bacteria tested for β-glucosidase activity using ρ-nitrophenyl-β-d-glucopyranoside as the substrate were selected. Acid development, viable populations, and quantification of isoflavones using HPLC were performed at 0, 24, and 48 h of incubation at 37 °C. The significant bioconversion (P < 0.001) of the glucoside isoflavones into their bioactive aglycones in soymilk fermented with four β-glucosidase-producing strains, with an average 7.1-fold increase of aglycones (daidzein + genistein) was observed. There appeared to be correlations between the level of growth and β-glucosidase activity of each strain, and the hydrolysis of conjugated isoflavones in soymilk fermentation. Lactobacillus sp. were able to readily proliferate in soymilk than Bifidobacterium sp. (P < 0.05) and therefore completed more rapidly the hydrolysis of glucoside isoflavones.The present study indicates that four β-glucosidase-producing lactic acid bacteria have great potential for the enrichment of bioactive isoflavones in soymilk fermentation. |
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