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Epigallocatechin gallate (EGCG) stability at 25 °C: (A) Chromatograph profile of incubation system stored for 20 days at 25 °C; (B) changes in substrates and products during storage of EGCG at 25 °C for 0 to 30 days; (C) apparent first-order kinetics of EGCG degradation; (D) percentage of the different transformation pathways when EGCG was stored for 20 days and 30 days.
