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Isoflavone, Phytic Acid and Oligosaccharide Contents of Domestic and Imported Soybean Cultivars in Korea  

류승현 ((주)대두식품)
김성란 (한국식품개발연구)
김경탁 (한국식품개발연구)
김성수 (한국식품개발연구원)
Publication Information
The Korean Journal of Food And Nutrition / v.17, no.2, 2004 , pp. 229-235 More about this Journal
Abstract
Chemical composition, total dietary fiber(TDF), oligosaccharide, isoflavone and phytic acid contents of seven domestic and three imported soybean cultivars were determined. TDF contents were ranged from 16.83 to 21.71%(w/w) without remarkable differences among soybean cultivars. Phytic acid contents of domestic cultivars such as Geomjongkong 1 (3.02%) and Dawonkong (2.92%) were higher than imported ones such as Canadian (2.07%) and American (2.22%) soybeans for soybean sprout and US No. 1 (2.16%). The phytic acid contents of cotyledon parts were 1.5 to 2 times higher than those of hypocotyl parts. Isoflavone contents in whole seed were wide ranged from 371 to 2,398 $\mu\textrm{g}$/g among cultivars and it were existed mainly as glucoside isomers. Profiles of isoflavone aglycones were composed of 52% genistein, 36% daidzein and 11% glycitein. Hwanggumkong, Dawonkong, Geomjongkong 1 and American soybean for sprout contained lower isoflavone than others. Hypocotyl parts of soybeans contained from 6120.1 to 16921.1 $\mu\textrm{g}$/g isoflavone with ratio of 48% glycitein, 35% daidzein and 10% genistein. Isoflavone contents of cotyledon parts were ranged 375-2393 $\mu\textrm{g}$/g, composition of which had no glycitein, 55% genistein and 38% daidzein. Oligosaccharide contents were similar among cultivars. Stachyose of 3.0-3.9%, raffinose of 0.8-1.2%, sucrose of 4.5-7.8% and fructose of 0.3-0.8% were determined.
Keywords
soybean; phytic acid; isoflavone; oligosaccharide;
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