Genetic Transformation of Soybeans by Soaking Its Seeds with the Total DNA of American Ginseng (Panax quinquefolium) Ⅱ.Determination of Isoflavone Content by HPLC Effects of different processing methods on content of flavonoids from Sophorae Fructus Simultaneous determination of the four effective components in Huaijiao pill by HPLC RP-HPLC determination of daidzein, genistein, daidzin and genistin in soybean extract