Microbial transformations of racemic 7-methoxyflavanone using strains of the genus Aspergillus (A. niger KB, A. ochraceus 456) and the strain Penicillium chermesinum 113 were described. The strain A. niger KB catalysed carbonyl group reduction, leading to (±)-2,4-cis-7-methoxyflavan-4-ol. Biotransformation with the help of A. ochraceus 456 gave two products: (+)-2,4-trans-7-methoxyflavan-4-ol and 4'-hydroxy-7-methoxyflavone. Transformation by means of P. chermesinum 113 resulted in a dihydrochalcone product, 4,2'-dihydroxy-4'-methoxydihydrochalcone. DPPH scavenging activity test proved that all the biotransformations products have higher antioxidant activity that the substrate.
利用曲霉属(A. niger KB、A. ochraceus 456)和青霉菌(Penicillium chermesinum 113)菌株对外消旋7-美氧
黄烷酮的微
生物转化进行了描述。A. niger KB菌株催化了羰基的还原,生成了(±)-2,4-cis-7-美氧黄烷-4-醇。借助A. ochraceus 456进行的
生物转化得到了两种产物:(+)-2,4-trans-7-美氧黄烷-4-醇和4'-羟基-7-美氧
黄酮。通过P. chermesinum 113的转化结果是一个二氢
查尔酮产物,即4,2'-二羟基-4'-美氧二氢
查尔酮。
DPPH清除活性测试表明,所有
生物转化产物的抗氧化活性均高于底物。