Figure 4: Isoflavone content in 14 soybean varieties planted at SUT Farm on 19 December 2009, categorized according to physical seed quality. Each soybean sample was extracted and assayed in triplicate ( ). Bars and error bars represent mean standard deviation. compared to undersized seeds. compared to unsound seeds. 1Isoflavone content was the summation of daidzin and genistin contents.