A Study of the Constitution of Alginic Acid by Partial Acid Hydrolysis.

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Abstract
Alginate from Laminaria digitata was hydrolysed in 1 [image] oxalic acid at 100[degree]. Approximately 30% of the sample was dissolved, and the hydrolysis of this fraction of the sample followed 1st order kinetics. The insoluble material had a number average degree of polymerization of 20[long dash]30 and was separated into two fractions by precipitation at pH 2. 85. The soluble fraction at this pH contained 80[long dash]90% mannuronic acid residues, the insoluble fraction 80-90% guluronic acid residues.

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