Abstract
Mucilage of Monostroma nitidum was analyzed. Component sugars of the mucilage were divided by ion-exchange resist into neutral and acid sugar fractions. The component sugars in each fraction were examined by paper chromatography. From the results, it was confirmed that the neutral sugar fraction consists of rhamnose, xylose, and galactose, and that the acid sugar fraction galacturonic acid. In a further examination, a hexuronic acid was detected in the acid sugar fraction by the WILLIAMS reaction. The acid sugar was confirmed to be galacturonic acid by the DISCHE'S thioglycolic acid and cysteine reactions. Quantitative paper chromatographic analysis showed that the mucilage contains xylose (1 part), galactose (4.2 parts), galacturonic acid (5 parts), and rhamnose (11.5 parts).
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