Fig. 4.
EPR spectra of quercetin, Fe2+/Fe3+ and EDTA in MeOH/H2O (v/v : 50/50) under anaerobic conditions except for (a). (a) quercetin (0.6 mM) + Fe3+ (0.3 mM), in air; (b) quercetin (0.6 mM) + Fe3+ (0.3 mM); (c) quercetin (0.4 mM) + Fe2+ (0.3 mM); (d) EDTA (0.6 mM) + Fe3+ (0.3 mM). Spectra (a), (b) and (c) have been amplified 10-fold.