Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10604634 | Carbohydrate Polymers | 2011 | 7 Pages |
Abstract
Water-soluble O-methyl glucomannan derivatives (O-MGs) with various degrees of substitution were obtained by direct alkylation reaction of an insoluble glucomannan with methyl iodide without any organic solvent including methanol and dimethyl sulfoxide. The structure of O-MGs was characterized by 1H, 13C, 1H 13C NMR-HSQC, and 1H 13C NMR-HMBC spectra. The reactive conditions for synthesizing of O-MG derivatives were also evaluated. The results shown that the optimal conditions for methylation of glucomannan were pH 10, temperature of 40 °C for 3 h. The degree of substitution (DS¯) of O-substitution increased from 0.09 to 0.175 since the ratio (w/v) of glucomannan/methyl iodide changed from 1/3 to 1/15.
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Nguyen Tien An, Do Truong Thien, Nguyen Thi Dong, Pham Le Dung, Pham Thi Bich Hanh, Tran Thi Y. Nhi, Duong Anh Vu,