Add time:07/19/2019         Source:sciencedirect.com

Treatment of xylan, starch, and chitin with m and 3m sodium hydroxide at 175° and 190° gave mixtures of non-volatile carboxylic acids in yields of 50–70%, 40–60%, and 5–13%, respectively, in which >60 hydroxy monocarboxylic acids and dicarboxylic acids were identified. The main compounds were glycolic, lactic, 2-hydroxybutanoic, 3-deoxypentonic, xyloisosaccharinic, and 3,4,5-trideoxyheptaric acids from xylan; glycolic, lactic, 3,4-dideoxypentonic, glucoisosaccharinic, and 3,4-dideoxyhexaric acids from starch; and glycolic, lactic, 2-hydroxybutanoic, and 3,4-dideoxyhexaric acids from chitin.

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