Article: Correlation of antioxidant activity and major isoflavonoid contents of the phytoestrogen-rich Pueraria mirifica and Pueraria lobata tubers.

Abstract

The antioxidant activity of wild Pueraria mirifica collected from 28 of the 76 provinces of Thailand and Pueraria lobata collected from China were assessed by 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay. P. mirifica tuberous extracts showed weak antioxidant activity in comparison with [alpha]-tocopherol. Six plant samples exhibited stronger antioxidant activity than the mean value of the P. mirifica population. In addition, the mean value of the P. mirifica population indicated significantly lower antioxidant activity than P. lobata. The analysis of the antioxidant activity of isoflavonoids revealed that puerarin and daidzein exhibited the same level of ...

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