Solvent dependence on antioxidant activity of some water-insoluble flavonoids and their cerium(IV) complexes

► Analysis of solvent effect on antioxidant activity in different aqueous solutions of DMSO. ► Some flavonoids occurring in plant foods including and naringenin, chrysin, and daidzein. ► The influence of Ce(IV) chelation on the radical scavenging activity (RSA) of the flavonoids. ► The normalized polarity parameter (ETN) and Kamlet, Abboud, and Taft (KAT) parameters. ► The Yasuda-Shedlovsky extrapolation for determination of the RSA values in pure water.