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http://dx.doi.org/10.7845/kjm.2013.3070

Enhanced Antioxidant Effect of Black Soybean by Cheonggukjang with Potential Probiotic Bacillus subtilis CSY191  

Hwang, Chung Eun (Department of Food Science, Gyeongnam National University of Science and Technology)
Seo, Weon Taek (Department of Food Science, Gyeongnam National University of Science and Technology)
Cho, Kye Man (Department of Food Science, Gyeongnam National University of Science and Technology)
Publication Information
Korean Journal of Microbiology / v.49, no.4, 2013 , pp. 391-397 More about this Journal
Abstract
Changes in ${\beta}$-glycosidase activity, total phenolic and isoflavone contents, and antioxidant activities during the fermentation of Korean black soybeans (Seoritae and Seomoktae) fermented food cheonggukjang by the potential probiotic Bacillus subtilis CSY191 were investigated. The levels of total phenolic and isoflavone-malonylglycoside and -aglycone contents increased, while 2,2-azinobis (3-ethyl-benzothiazoline-6-sulfonic acid) diammonium salt (ABTS) radical scavenging activity and ferric reducing/antioxidant power (FRAP) increased, but the isoflavone-glycoside contents decreased after cheonggukjang fermentation. The content of antioxidant compounds, including isoflavone-aglycones and -malonylglycosides, was increased by fermenting-processing, whereas the content of isoflavone-glycosides was decreased in the fermented soybeans. In particular, the Seoritae soybean fermented at 3 $7^{\circ}C$ for 48 h displayed the highest antioxidant activities, compared to those of the Seomoktae soybean and the fermented. The highest levels of daidzein, glycitein, and genistein were present at concentrations of 253.0 ${\mu}g/g$, 72.5 ${\mu}g/g$, and 114.1 ${\mu}g/g$ after 48 h of Seoritae soybean fermentation. From those results, we suggest that the high antioxidant activity of cheonggukjang of black soybeans might be related to the markedly higher levels of total phenolic and isoflavone-aglycone and -malonylglycoside contents achieved during fermentation.
Keywords
Bacillus subtilis CSY191; antioxidant activity; black soybean; cheonggukjang; isoflavones;
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