کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1385385 982443 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Distribution of d-glucosamine moieties in heterogeneously deacetylated cuttlefish chitin
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Distribution of d-glucosamine moieties in heterogeneously deacetylated cuttlefish chitin
چکیده انگلیسی

The distribution of d-glucosamine moieties was investigated in partially deacetylated chitins prepared under various conditions but with nearly the same degree of deacetylation in the range of 30–65%. The presence of adjacently located (blocked) d-glucosamine moieties was demonstrated by the formation of 2,5-anhydro-d-mannose using the nitrous acid deamination method. Both the alkali concentration and the deacetylation temperature affected the distribution of the d-glucosamine moieties. Within the range of deacetylation mentioned, the amount of released 2,5-anhydrous-d-mannose may vary up to 6-fold, highly depending on the conditions applied during the deacetylation. The effect of reaction conditions on other characteristics, swelling indices, crystallinity, thermal properties and the formation of acid insoluble material, supports the hypothesis that external conditions during thermochemical deacetylation can control the distribution of d-glucosamine in partially deacetylated chitin.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 69, Issue 2, 1 June 2007, Pages 382–390
نویسندگان
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