J Agric Food Chem, 2011 Oct 25
In the present study, we have investigated the chemical composition and antioxidant activity of water extract of propolis (WEP) collected from 26 locations in China.
Spectrophotometry was used to determine the physico-chemical properties and the chemical constituents of WEP. Phenolic compounds in WEP were identified by RP-HPLC-DAD with reference standards. The antioxidant activities [characterized by reducing power and 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging ability] of WEP were also measured.
Results show that epicatechin, p-coumaric acid, morin, 3,4-dimethoxycinnamic acid, naringenin, ferulic acid, cinnamic acid, pinocembrin and chrysin are the major functional phenolic compounds in Chinese WEPs.
Furthermore, most WEPs show strong antioxidant activities, which are significantly correlated with , an index for estimation of the quality of WEP. WEPs also contain many more active constituents than that of ethanol extracts of propolis.
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