Rheological Properties of Succinoglucan 10C3 from Alcaligenes faecalis var. myxogenes

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The H-, Na- and Ca-forms of succinoglucan 1OC3 form homogenous dispersions in water. The viscosities of 1% aqueous dispersion of the H- and Ca-forms were 1560 and 2500 centipoises respectively at 30°C. The viscosity of the Na-form, which is extremely low, was increased greatly by an addition of many inorganic salts and especially the Fes+ and Al³⁺ iones. The viscosity of the Ca-form did not change by the presence of sodium chloride or calcium chloride.
The viscosities of Ca-form, and Na-form in the presence of 1% sodium chloride became near zero at 65.5°C and 69.5°C, respectively. When the dispersions were kept at 70°C or 90°C for ten minutes, the viscosities of the H-form, the Na-form, and the Ca-form in the presence of sodium chloride increased greatly. The viscosity of the Ca-form and that of the Na-form in the presence of 1% sodium chloride were essentially indepen-dent of pH.