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Chromatographic profiles at 280 nm of tannins in model wine solutions with the main peaks identified: 1, gallic acid; 5, α-punicalagin; 6, β-punicalagin; 9, ellagic acid; 10, polymeric tannins; 11, procyanidin B1; 12, (+)-catechin; 13, (−)-epicatechin; 14, procyanidin B2. TP, Pomegranate tannin; TGS, grape seed tannin; TNG, Nut gall tannin; TOAK1–5, Oak tannin 1–5.
