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(A) Schematic overview of the flavan-3-ol thio-conjugates (1–3) formation by depolymerization of grape polymeric flavanols in the presence of cysteine, captopril or tiopronin under acidic conditions; (B) Free radical scavenging activity of the thio-conjugates in the DPPH• assay. The scavenging ability of Trolox, catechin and epicatechin is also reported for comparison.
