Abstract
ABSTRACTA comparison was made between three basic methods for determining methoxyl (OMe) groups in a polyuronide, viz., step‐wise oxidation‐reduction initiated by hydriodic acid, neutralization of de‐esterified carboxyl groups with potassium hydroxide, and direct combustion of methanol by gas chromatography. Accuracy and precision of the methods were ascertained by analyzing methyl fuorate. All the methods were accurate. The neutralization and gas chromatographic methods had major advantages of simplicity and shortness of time of completion over the hydriodic acid/bromine method. Dimethylsulfoxide in the the saponification medium had no special effect.
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