Catechinic compounds suppress free radicals in camellia oil by donating hydrogen atoms: quantum chemistry calculation combined with EPR detection.

Moreover, the DMPO oxidative radical (•X), originating from DMPO oxidation( Yang et al., 2022 ), showed an increasing trend with the extension of heating time, both GCG and EGCG showed golden efficiency to inhibit the generating of •X with the rates between 86.15 ± 2.96 % and 99.17 ± 0.02 %.

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The inhibitory activities of GCG and EGCG towards •R and •OR showed a time dependence, the highest efficiencies of GCG and EGCG towards •R as well as GCG towards •OR were occurring at 20 min (180 °C), with the rate of 69.64 ± 0.27 %, 60.06 ± 0.38 %, 68.40 ± 0.82 %, respectively, with respect to the inhibition rate of GCG and EGCG towards •R and •OR, it showed a decreasing trend with the extension of heating time ( Fig. 3 ), this was attributable to the thermal acceleration of lipid oxidation chain reactions, where the rate of radical generation surpassed the antioxidant capacity for consumption and regeneration.

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