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Effects of Lactulose Supplementation on the Growth of Bifidobacteria and Biotransformation of Isoflavone Glycosides to Isoflavone Aglycones in Soymilk

Pham, Thuy Thi and Shah, Nagendra P (2008) Effects of Lactulose Supplementation on the Growth of Bifidobacteria and Biotransformation of Isoflavone Glycosides to Isoflavone Aglycones in Soymilk. Journal of Agricultural and Food Chemistry, 56 (12). pp. 4703-4709. ISSN 0021-8561

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Abstract

Bifidobacterium animalis subsp. lactis bb12 and B. longum 20099 were used to hydrolyze isoflavone glycosides (IG) to biologically active forms, which are isoflavone aglycones (IA), in soymilk (SM) prepared from soy protein isolate (SPI) and SM supplemented with 0.5% (w/v) of lactulose (SML). Supplementation of lactulose significantly (p <0.05) enhanced the viable counts of B. animalis subsp. lactis bb12 and B. longum 20099 up to 2.34 and 2.15 log CFU/mL, respectively. Bifidobacterium animalis subsp. lactis bb12 and B. longum 20099 utilized 3.32 and 3.75 mg/mL of lactulose at 24 h of incubation, respectively. Supplementation of lactulose also appeared to be a key factor in decreasing the pH of SML. The biotransformation of IG to IA was enhanced significantly by 6.8-17.1% and 12.8-13.5% in SML by B. animalis subsp. lactis bb12 and B. longum 20099, respectively. However, the presence of lactulose in SML showed the stimulating effect on B. longum 20099 only after 12 h of incubation. Isoflavone aglycones ranged from 69.5 to 77.1% of total isoflavone compounds in SML after incubation.

Item Type: Article
Uncontrolled Keywords: ResPubID15454, soymilk, isoflavone aglycones, lactulose, isoflavone glycosides, Bifidobacterium, biotransformation
Subjects: Faculty/School/Research Centre/Department > Institute for Sustainability and Innovation (ISI)
FOR Classification > 0908 Food Sciences
SEO Classification > 8602 Dairy Products
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Depositing User: VUIR
Date Deposited: 13 Sep 2011 05:37
Last Modified: 13 Sep 2011 05:37
URI: http://vuir.vu.edu.au/id/eprint/3890
DOI: 10.1021/jf072716k
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Citations in Scopus: 10 - View on Scopus

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