In the present study, free flavan-3-ol monomers mainly included catechin, epicatechin, and epicatechin gallate, and their levels all showed a decreasing trend with ripening ( Figure 5 a).
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Evolution of Seed-Soluble and Insoluble Tannins during Grape Berry Maturation.
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The three extension units of insoluble CT all showed an increasing trend with ripening ( Figure 6 b).