Research of bioavailability and antioxidant activity of polyphenol in Lycium ruthenicum Murr

The effect of chemical extraction ( i.e., extracts) and in vitro digestion ( i.e., digesta) method on the polyphenol content of Lycium ruthenicum Murr was investigated in this paper. Four different methods including DPPH, FRAP, ABTS, and ORAC were used to measure its antioxidant activity.The results showed that digesta had more free phenolic acids ( FPA) , but less total phenolic content ( TPC) and total anthocyanin content ( TAC) than extracts.The antioxidant activity of the extracts was higher than digesta.The correlations were high between TPC, TAC and chemical antioxidant activity ( R2> 0.83) .FPA were better correlated with the chemical antioxidant assays in digesta ( R2> 0.68) than extracts ( R2> 0.03) .