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A Temperature Responsive Polysaccharide Derivative in Aqueous Solution : Amylose Ethyl Carbamates

Kimura, Shunji 大阪大学

2020.06.12

概要

Partly substituted amylose ethylcarbamate (AEC) samples for which degree of substitution DS and weight-average molar mass Mw range between 0.21 – 1.95 and 40 – 130 kg mol−1 , respectively, were prepared from enzymatically synthesized amylose. The particle scattering function P(q) of the AEC samples in polar organic solvents and water showed that local helical structure is retained as in the case of amylose and fully substituted AEC. The AEC samples with DS < 1.3 were soluble in water, and furthermore, the lower critical solution temperature (LCST) type phase separation was found for the samples with 0.9 < DS < 1.3. The cloud point temperature Tcloud varied from 12 C to 41 C depending on DS, Mw, and the polymer mass concentration c. The Tcloud values determined as a function of c had a minimum at 10 – 100 mg mL−1 . The LCST tended to rise with lowering Mw and DS. Iodine test indicated that all watersoluble AEC samples formed complex with iodine while the absorption peak wavelength shifted blue with increasing DS. The local helical structure of AEC may form inclusion complex with hydrophobic molecules. AEC is possibly used for a novel capture material which can be separated from water by temperature elevation.

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