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Variation of Isoflavone and Saponin During Maturity in Black Soybean  

Yi, Eun-Seob (Gyeonggido Agricultural Research and Extension Services)
Kim, Hee-Dong (Gyeonggido Agricultural Research and Extension Services)
Chae, Jae-Cheon (College of Bio-resources Science, Dankook Univ.)
Kim, Yong-Ho (College of Natural Science, Soonchunhyang University)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.53, no.1, 2008 , pp. 34-41 More about this Journal
Abstract
This study was conducted to investigate antioxidant component content during maturity for judgement of optimum harvest time in black soybean. For high-functional black soybean production, accumulation pattern of isoflavone and saponin contents and anti oxidative activity according to maturity stage were investigated. Varieties used in this experiment were Ilpumgemojeongkong and heukcheongkong, which are the recommended black soybean in Korea. Isoflavone and saponin contents during maturity period in black soybean was the highest at $6{\sim}7$ days earlier than general harvesting time. It was indicated that optimum harvesting time for high quality soybean were $3{\sim}7$ days earlier than harvesting time for higher yield. As a result of investigation about accumulation pattern of antioxidant components by maturity stages in seed, total isoflavone content was the highest at 61 DAF in Ilpumgeomjeongkong and at 77 DAF in Heukcheongkong. Contents of total saponin were the highest at 61 DAF and at 71 DAF, respectively. In case of leaf, total isoflavone content was the highest at 55 DAF in Ilpumgeomjeongkong and Heukcheongkong. Contents of total saponin were the highest at 18 DAF and at $55{\sim}71$ DAF, respectively. It showed that black soybean's leaf could be developed as a new health food material, owing to high contents of antioxidant components and biological activity and it's suitable harvest time was at $R_7$.
Keywords
black soybean; antioxidant component; isoflavone; saponin; harvest time;
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