KMID : 0665220040170020229
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Korean Journal of Food and Nutrition 2004 Volume.17 No. 2 p.229 ~ p.235
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Isoflavone, Phytic Acid and Oligosaccharide Contents of Domestic and Imported Soybean Cultivars in Korea
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Kim Kyung-Tack Kim Seung-Soo
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Abstract
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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 mutextrm{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 mutextrm{g}/g isoflavone with ratio of 48£¥ glycitein, 35£¥ daidzein and 10£¥ genistein. Isoflavone contents of cotyledon parts were ranged 375-2393 mutextrm{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.
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KEYWORD
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soybean, phytic acid, isoflavone, oligosaccharide
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