کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10604634 | 982530 | 2011 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A simple methylation method for obtaining water-soluble O-methyl glucomannan derivatives
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: A simple methylation method for obtaining water-soluble O-methyl glucomannan derivatives A simple methylation method for obtaining water-soluble O-methyl glucomannan derivatives](/preview/png/10604634.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 84, Issue 1, 11 February 2011, Pages 173-179
Journal: Carbohydrate Polymers - Volume 84, Issue 1, 11 February 2011, Pages 173-179
نویسندگان
Nguyen Tien An, Do Truong Thien, Nguyen Thi Dong, Pham Le Dung, Pham Thi Bich Hanh, Tran Thi Y. Nhi, Duong Anh Vu,