Free radical-scavenging activity and flavonoid contents of Polygonum orientale leaf, stem, and seed extracts
2009
Jiang, X. | Chen, X. | Wei, Y., South Central University, Changsha (Chine). College of Chemistry and Chemical Engineering
The present study was designed to explore the total flavonoid and taxifolin contents and the radical-scavenging activity of 50% ethanol extracts of Polygonum orientale leaves, stems, and seed by 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. The extract with higher total flavonoid content has higher radical scavenging activity. Taxifolin (IC50=2.83 micromol/L) has antioxidant activity stronger than that of rutin (IC50=3.08 micromol/L). The free radical-scavenging potentials of chloroform, ethyl acetate, water, ethanol, and methanol extracts of Polygonum orientale seeds were also investigated. The free radical-scavenging abilities of various extracts were determined as: methanol is greater than ethanol is greater than water is greater than ethyl acetate is greater than chloroform.
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