7CHEN Y, WANG M F, ROSEN R T, et al. 2, 2-Diphenyl-1-picrylhydrazyl radical-scavenging active components from Polygonum nadtiflorum Thunb. [J]. Journal of Agricultural Food Chemistry, 1999,47:226-228.
8LI H B, WONG C C, CHENG K W,et al. Antioxident properties in vitro and total phenolic contents in methanol extracts from medicinal plants [ J ]. Lebensmittel-wissenschaft Technology ,2008,41 ( 3 ) 385 - 390.