<研究報告>アルギン酸およびその誘導体の物理化学的性質の研究(VI) : アルギン酸プロピレン・グリコール・エステルの性質

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The properties of the aqueous solution of propylene glycol ester of alginic acid (PGA) are tested and the results obtained are as follows; 1. The viscosity of PGA aqueous solution used in this experiment still shows characterisitics of poly electrolyte, owing to residual free carboxyl groups; influence of the added salt, suitability of Fuoss' equation, etc. 2. PGA aqueous solution can coexist with heavy metal ion or hydrochloric acid of considerable concentration but its gelation may be prevented unless free carboxyl groups exist in the molecule. But the addition of acetic acid does not gelatinize PGA aqueous solution. 3. PGA aqueous solution shows the maximum viscosity at about pH 5. The pH value at the muximum viscosity is shifted more acid in PGA aqueouss solution than alginate aqueous solution. 4. When the mixed aqueous solution of PGA (0.35%) and sodium oxalate (0.2N) is heated for 5 hours at 50℃, the viscosity of this solution increases rapidly, as in sodium alginate. 5. PGA powder is stable on drying but decomposes slowly on standing for a long time at high humidity. In the case of PGA solution, however both the viscosity and the degree of esterification decrease slightly on standing at room temperature for about one month.
福岡女子大学の論文
1972-10-30