Вид документа : Статья из журнала Шифр издания : 54/S 45 Автор(ы) : Pestov A. V., Kodess M. I., Matochkina E. G., Yatluk Yu. G. Заглавие : Selective mоnо-N-2-carboxyethylation of chitosan in the presence of magnesium halides Место публикации : Carbohydrate Polymers. - 2011. - Vol. 86, № 2. - С. 783-788 Примечания : Bibliogr. : p. 787-788 (19 ref.) ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: The solubility of chitosan in aqueous solutions of lithium and magnesium halides varies in the order: LiCl LiBr LiI; MgCl2 MgBr2 MgI2. A method for selective production of mono-N-(2-carboxyethyl)chitosan (NCE-chitosan) was developed by synthesis in gel (concentration of chitosan 4-20%) of the magnesium halides solution (1.1-3.5 M) using acrylic acid. Using for reaction of MgI2 or MgBr2 provides relative greater amount of the monosubstituted amino groups (73-87%) in comparison with their absence (50-70%) at the high degree of substitution (DS) more than 0.7. DS of the prepared NCE-chitosan and the ratios mono-: disubstitution of amino groups was determined by 1H NMR spectroscopy. The chemical structure of the obtained NCE-chitosan was characterized by FT-IR and 13C NMR spectroscopies Держатели документа: Центральная научная библиотека УрО РАН Доп.точки доступа: Pestov, A. V.; Kodess, M. I.; Кодесс Михаил Исаакович; Matochkina, E. G.; Yatluk, Yu. G.; Ятлук Юрий Григорьевич