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The Biosynthesis of (+)-Tartaric Acid in Pelargonium crispum¹

^a Department of Biology, State University of New York at Buffalo, Buffalo, New York 14214

Metabolic conversion of L-galactono-1, 4-lactone and L-ascorbic acid to (+)-tartaric acid and oxalic acid has been studied in Pelargonium crispum, cv. Prince Rupert. Experiments with specifically labeled substrates suggest a path of conversion involving cleavage of L-ascorbic acid, or a metabolic product of L-ascorbic acid, between C₂ and C₃, such that oxalic acid arises from the two carbon fragment and (+)-tartaric acid from the four carbon fragment.

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				T. A. Kostman, N. M. Tarlyn, F. A. Loewus, and V. R. Franceschi Biosynthesis of L-Ascorbic Acid and Conversion of Carbons 1 and 2 of L-Ascorbic Acid to Oxalic Acid Occurs within Individual Calcium Oxalate Crystal Idioblasts Plant Physiology, February 1, 2001; 125(2): 634 - 640. [Abstract] [Full Text]