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HPLC-ESI-MSn spectra of the autoxidation products of (-)-epicatechin: (A) Base peak chromatogram of the autoxidation of (-)-epicatechin; (B) Products generated through the autoxidation of (-)-epicatechin; catechin [36], procyanidin B2 [31,37], procyanidin A [36] and (C) TLC pattern of the PPO mix and ESI-MS of the possible oligomers (peaks 9–15) obtained through the autoxidation of (-)-epicatechin.
