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Changes in Isoflavone Profiles during Cheongyukjang Preparation, A Traditional Banga Food  

Lee, Seung-Wook (Department of Food Science and Technology, Seoul National University of Technology)
Park, Yong-Woo (Department of Food Science and Technology, Seoul National University of Technology)
Han, Yang-Sun (Department of Food Science and Technology, Seoul National University of Technology)
Chang, Pahn-Shick (Department of Food Science and Technology, Seoul National University of Technology)
Lee, Jong-Mee (Department of Food and Nutritional Sciences, Ewha Womans University)
Kim, Young-Suk (Department of Food Science and Technology, Ewha Womans University)
Lee, Jae-Hwan (Department of Food Science and Technology, Seoul National University of Technology)
Publication Information
Korean Journal of Food Science and Technology / v.41, no.2, 2009 , pp. 141-145 More about this Journal
Abstract
Cheongyukjang, a Banga food, is a heavy soy-soup prepared by boiling cheonggukjang, sea foods, and meats. Soybeans roasted at 140$^{\circ}C$ for 21.0 min and 220$^{\circ}C$ for 6.0 min, respectively, were used for cheonggukjang preparation. Distributions of isoflavones in raw soybeans, roasted soybeans, cheonggukjang, and cheongyukjang were analyzed by high performance liquid chromatography. The total isoflavones in roasted soybeans, cheonggukjang and cheongyukjang were about 79-80, 56-65, and 47-50% of those in raw soybeans, respectively. Roasting caused significant increases in acetyl derivatives and ${\beta}$-glucoside isoflavones, and significant decreases in malonyl derivatives (p < 0.05). The major isoflavones in cheonggukjang and cheongyukjang were ${\beta}$-glucosides. Succinyl-${\beta}$-daidzin and succinyl-${\beta}$-genistin, which are recognized as new metabolites of isoflavones, were not detected in raw and roasted soybeans. Peak areas of succinyl-${\beta}$-genistin were higher than thse of succinyl-${\beta}$-daidzin, in both cheongyukjang and cheonggukjang.
Keywords
cheongyukjang; isoflavones; cheonggukjang; roasting; succinyl isoflavones;
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Times Cited By KSCI : 10  (Citation Analysis)
Times Cited By SCOPUS : 1
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