Bioconversion of isoflavone glycosides to aglycones, mineral bioavailability and vitamin B complex in fermented soymilk by probiotic bacteria and yeast

Rekha, C. R. and Vijayalakshmi, G. (2010) Bioconversion of isoflavone glycosides to aglycones, mineral bioavailability and vitamin B complex in fermented soymilk by probiotic bacteria and yeast. Journal of Applied Microbiology. pp. 1-11. ISSN 1364-5072

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Abstract

Aim: To study the role of b-glucosidase producing probiotic bacteria and yeast in the biotransformation of isoflavone glycosides to aglycones, mineral bioavailability and vitamin B complex in fermented soymilk. Methods and Results: Five isolates of probiotic lactic acid bacteria (LAB), Lactobacillus acidophilus B4496, Lactobacillus bulgaricus CFR2028, Lactobacillus casei B1922, Lactobacillus plantarum B4495 and Lactobacillus fermentum B4655 with yeast Saccharomyces boulardii were used to ferment soymilk to obtain the bioactive isoflavones, genistein and daidzein. High-performance liquid chromatography was used to analyse the concentration of isoflavones. Bioactive aglycones genistein and daidzein after 24 and 48 h of fermentation ranged from 97Æ49 to 98Æ49% and 62Æ71 to 92Æ31% respectively with different combinations of LAB with yeast. Increase in bioavailability of minerals and vitamin B complex were also observed in fermented soymilk. Conclusions: LAB in combination with yeast S. boulardii has great potential for the enrichment of bioactive isoflavones, enhancing the viability of LAB strains, decreasing the antinutrient phytic acid and increasing the mineral bioavailability in soymilk fermentation. Significance and Impact of the Study: Fermentation of soymilk with probiotic organisms improves the bioavailability of isoflavones, assists in digestion of protein, provides more soluble calcium, enhances intestinal health and supports immune system. Increased isoflavone aglycone content in fermented soymilk improves the biological functionality of soymilk.

Item Type:	Article
Uncontrolled Keywords:	b-glucosidase isoflavones Lactobacillus Saccharomyces boulardii soymilk fermentation starter cultures
Subjects:	600 Technology > 05 Chemical engineering > 04 Fermentation Technology 600 Technology > 08 Food technology > 22 Legumes-Pulses > 05 Soya bean
Divisions:	Food Microbiology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	21 Nov 2005
Last Modified:	30 Dec 2016 13:10
URI:	http://ir.cftri.res.in/id/eprint/217

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