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KMID : 0364819850230040302
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Korean Journal of Microbiology
1985 Volume.23 No. 4 p.302 ~ p.306
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A Possible Enzymatic Catabolism of L-Ascorbic Acid via α-Ketoaldehydes
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Kang Sa-Ouk
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Abstract
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1
It is shown by means of nuclear magnetic resonance spectroscopy that 3,4,5-trihydroxy-2-keto-Lvaleraldehyde (L-xylosone), an a-ketoaldehyde, is formed during the oxidative catabolism of L-ascorbic acid. It is proposed that this substance serves as a substrate for the glyoxalase system by which it is transformed to L-xylonic acid. As L-xylonic acid is further oxidized to L-erythroascorbic acid, a biochemical pathway is proposed for the action of vitamin C which consists of two further Y-lactones and three different substrates of the glyoxalase system.
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