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Total antioxidant activity of Zhenjiang aromatic vinegar (ZAV) measured by three different assays. (A) DPPH assay, (B) ABTS assay, (C) FRAP assay. All data are expressed as mean ± S.D. (n = 6). * p < 0.05, ** p < 0.01, *** p < 0.001 vs. ZAV-5, n.s. indicates no significant difference.
