Comparison of isoflavones composition in seed, embryo, cotyledon and seed coat of cooked-with-rice and vegetable soybean (Glycine max L.) varieties

Isoflavones in Korean soybeans differing in seed coat and cotyledon color

“…3). For all soybeans, glycosides and malonylglycosides represented 90% or more of the total isoflavones; such results are in accordance with numerous other studies (Lee et al, 2003a,b;Kim et al, 2007). While the contribution of glycosides to total isoflavones ranged between 30 and 50% at Chuncheon, Milyang, Yesan and Yeoncheon, their proportion was much greater at Iksan, averaging 79% (Fig.…”

“…In accordance with our results, Kim et al (2005) reported on the isoflavone concentrations of soybean varieties collected from nine provinces in Korea with yellow and black seed coat; total isoflavone concentration being greater in yellow than in black soybeans. Kim et al (2007), however, reported that total isoflavone concentration in black and brown soybeans was slightly higher than green or yellow soybeans. Furthermore, Wang et al (2000) failed to observe differences in total isoflavone concentrations among 210 North American soybeans differing in seed coat color grown at one site.…”

“…Differences in total isoflavone concentrations between soybeans differing in seed coat color were reported by some; however, results are mostly inconclusive because of the often limited number of varieties compared (Kim et al, 2005(Kim et al, , 2007. Wang et al (2000) reported that among 210 North American varieties, while total isoflavone concentrations were not affected by seed coat color, associations with specific individual isoflavones were observed.…”

Effect of different sample preparation methods on isoflavone, lignan, coumestan and flavonoid contents of various vegetables determined by triple quadrupole LC–MS/MS

“…The sample extractions performed in this study were based on methods previously developed and used by Kim et al (2007), with modifications.…”

Evaluations and Selections for High Isoflavone Black Soybean Mutants Induced by NaN<sub>3</sub> Treatment

“…The seed coats of black soybean are rich in anthocyanins and proanthocyanidins, and have a considerably higher degree of anti-oxidative activity than yellow soybeans [19,21]. Black soybeans also contain large amounts of isoflavones in their cotyledons [19].…”