Add time:09/24/2019 Source:sciencedirect.com
Aqueous solutions of 4-O-methyl-D-glucuronic acid at pH 7 were heated at 100°, and the monocarboxylic acids formed by isomerization were separated by anion-exchange chromatography and further identified by gas-liquid chromatography-mass spectrometry. After 6 h, the following yields of acids were obtained: 3-O-methyl-D-lyxo-5-hexulosonic (47%), 3-O-methyl-L-ribo-5-hexulosonic (12%), 4-O-methyl-D-mannuronic (4%), and 3-O-methyl-L-ribo-4-hexulosonic (1%).
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