Synergistic Antioxidant Properties of C6-C3-C6 Polyphenol Monomer with C6-C3 in Vitro

In order to discuss synergistic antioxidant properties of C6-C3-C6 polyphenol monomer with C6-C3 in vitro, activity of scavenging DPPH radical and total reducing power were used as indexes for appraising antioxidant activity of polyphenol monomer. Determination of antioxidant activities in vitro for different mixed systems including chlorogenic acid, protocatechuic acid, quercetin and catechin was carried out. At the same time, the comparison of the measured values and the predictive value was investigated. The results showed that interaction of polyphenol mixtures on antioxidant activities was related to the structure types, quantity and proportion of polyphenols in mixtures. Meanwhile, the bigger the difference of antioxidant capacity is for polyphenols in monomer state, the more powerful the synergistic effect is, but there is no direct link between the synergistic effects with concentration of polyphenols.