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Isoflavone Content in Soy Sauce made with Whole Grain Soybean Meju during Fermentation  

Lee, Hee-Young (Dept. of Food and Nutrition, Changwon National University)
Cha, Yong-Jun (Dept. of Food and Nutrition, Changwon National University)
Publication Information
The Korean Journal of Food And Nutrition / v.19, no.4, 2006 , pp. 460-465 More about this Journal
Abstract
This study was conducted to investigate the isoflavone contents including daidzein and genistein in soy sauces made with whole grain soybean Meju(WGSM), comparing with defatted Meju(DM) du.ins fermentation. Total isoflavone contents in 2 soy sauces made with DM, Control and product A, increased with period of fermentation and were 15 and 4.3 times higher after 180 days of fermentation than on the day before fermentation respectively. Meanwhile, 2 soy sauces made with WGSM, product B and C, had the highest amounts with $20.53{\mu}g/g\;and\;19.52{\mu}g/g$ of isoflavones on the day before fermentation respectively, and then decreased with fermentation time. High amounts of isoflavones were detected in 20 days of fermentation of soy sauce which made with WGSM and wheat Meju(product D). Daidzein was the largest amounts in isoflavone contents, regardless of total or free isoflavone types. The level of daidzein increased with fermentation time in 2 soy sauces made with DM, Control and product A, whereas 2 soy sauces made with WGSM, product B and C decreased with fermentation time, instead of increasing of genistein contents.
Keywords
soy sauce; whole grain soybean Meju; improved Meju; isoflavone; daidzein; genistein;
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