Journal
FOOD CHEMISTRY
Volume 93, Issue 2, Pages 325-330Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2004.09.030
Keywords
grape juice; wine vinegar; antioxidant activity; ORAC-FL; polyphenols
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Antioxidant activity of commercial red (n = 5) and white (n = 5) grape juices and wine vinegars (n = 5) were determined by the oxygen radical absorbance capacity (ORAL) assay using fluorescein (FL) as fluorescent probe. The ORAL-FL values varied from 14.6 to 25.0 mu mol of trolox equivalents/ml for red grape juices, from 3.5 to 11.1 mu mol of trolox equivalents/ml for white grape juices, and from 4.5 to 11.5 mu mol of trolox equivalents/ml for wine vinegars. Differences in the antioxidant activities among grape juice, wine, and vinegar were attributed to their different phenolic contents and compositions and to other non-phenolic antioxidants present in the samples. These data confirm grape juice and wine vinegar as good dietary sources of antioxidants. (c) 2004 Elsevier Ltd. All rights reserved.
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