Author:
Altermatt H. A.,Simpson F. J.,Neish A. C.
Abstract
The lactic acid produced from D-ribose-1-C14 or D-xylose-1-C14 had only a trace of isotopic carbon in the carbinol group, while the methyl carbon had 40% and carboxyl carbon 20% of the specific activity of carbon-1 of the pentose. The lactic acid from D-xylose-2-C14 was labelled to a slight extent in the methyl group, while the carbinol carbon and the carboxyl carbon had 40% and 20% respectively of the C14 concentration of carbon-2 of the sugar. D-Xylose-5-C14 gave lactic acid labelled mainly in the methyl carbon, which had about 60% of the specific activity of carbon-5 of the pentose. The other fermentation products (2,3-butanediol, ethanol, acetic acid, formic acid, and carbon dioxide) were labelled as if they had been formed from pyruvate with the same labelling as the lactic acid. These results offer additional support to the hypothesis whereby complete conversion of pentose to triose occurs via a heptulose.
Publisher
Canadian Science Publishing
Cited by
12 articles.
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