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Effect of sulfite/metabisulfite addition to organic white wines on flavonoids measurements. Flavonoids assay was performed using catechin for the calibration curve. (A) AO organic wine. (B) BO organic wine. (C) CO organic wine. Closed grey bars: sodium sulfite addition. Open white bars: sodium metabisulfite addition. Data are means of four replicates ± SE. * p < 0.05 relative to control without sulfite/metabisulfite addition by Student t-test.
