Biotransformation of daidzein, genistein and biochanin A by three selected filamentous fungi was investigated. As a result of biotransformations, six glycosylation products were obtained. Fungus Beauveria bassiana converted all tested isoflavones to 4″-O-methyl-7-O-glucosyl derivatives, whereas Absidia coerulea and Absidia glauca were able to transform genistein and biochanin A to genistin and sissotrin, respectively. In the culture of Absidia coerulea, in addition to the sissotrin, the product of glucosylation at position 5 was formed. Two of the obtained compounds have not been published so far: 4″-O-methyl-7-O-glucosyl biochanin A and 5-O-glucosyl biochanin A (isosissotrin). Biotransformation products were obtained with 22%–40% isolated yield.
研究了三种精选丝状真菌对
染料木素、
染料木素和
生物茶素 A 的
生物转化。
生物转化的结果是获得了六种糖基化产物。真菌 Beauveria bassiana 将所有测试的异
黄酮转化为 4″-O-methyl-7-O-glucosyl 衍
生物,而 Absidia coerulea 和 Absidia glauca 能够将 genistein 和 biochanin A 分别转化为 genistin 和 sissotrin。在薏苡(Absidia coerulea)的培养过程中,除了形成 sissotrin 外,还在第 5 位形成了
葡萄糖基化产物。迄今为止,所获得的化合物中有两种尚未发表:4″-O-methyl-7-O-glucosyl biochanin A 和 5-O-glucosyl biochanin A(isosissotrin)。
生物转化产物的分离率为 22%-40%。