Abstract
A major component of anthocyanin pigments presently isolated from wild grape (Vitis coignetiae) berries was studied for its antioxidative activity. This anthocyanin, of which 337mg was obtained from 8kg fresh berries, was identified as malvidin-3, 5-diglucoside (MDG). MDG inhibited autoxidation of linoleic acid at pH 2.8, 4.6 and 5.5, with stronger activity at lower pH. This suggested that flavylium cation form of MDG was more important in the antioxidative activity of MDG. Activity of MDG was weaker than that of %alpha;-tocopherol, on molar basis. The aglycone of MDG showed stronger antioxidative activity than that of MDG at the early stage of the autoxidation, presumably indicating participation of 3-hydroxy group of the aglycone in mode of antioxidative action.
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