Abstract

Ascorbic Acid (Vitamin C) has been shown to be absent although dehydroascorbic acid has been found in several varieties of Saskatoon berries currently being cultivated at the Canada Department of Agriculture Research Station at Beaverlodge, Alberta. Synthetic L-ascorbic acid is rapidly degraded after addition to expressed juice of the berries. Evidence of an ascorbic acid oxidizing system has been revealed, and the effects of pigmentation and approaching maturity on the enzyme system have been examined. The effects of various pigments, polyphenols and copper ions on the oxidation have also been studied, and the implications of these results are discussed.

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