کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1388433 982793 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rapid homogeneous lauroylation of wheat straw hemicelluloses under mild conditions
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Rapid homogeneous lauroylation of wheat straw hemicelluloses under mild conditions
چکیده انگلیسی

Hemicellulose-based hydrophobic biomaterials with degrees of substitution ranging from 0.46 to 1.54 were synthesized under mild conditions in homogeneous media (N,N-dimethylformamide–lithium chloride) by reacting the native wheat straw hemicellulosic polymers with lauroyl chloride using 4-dimethylaminopyridine as a catalyst. Other catalysts such as N-bromosuccinimide, N-methyl pyrrolidine, N-methyl pyrrolidinone, and pyridine were also investigated. Under optimum reaction conditions (2 equiv of lauroyl chloride and triethylamine per hydroxyl group, 5% 4-dimethylaminopyridine, 40 °C, 35 min), a high DS value of 1.54 was obtained. The biomaterials were characterized by FT-IR spectroscopy and 13C NMR spectroscopy as well as by thermal analysis. The results showed that the lauroylation occurred preferably at the C-3 hydroxyl group of β-d-Xylp units in the hemicelluloses, and the thermal stability of the hydrophobic polymers increased by esterification.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Research - Volume 343, Issue 17, 24 November 2008, Pages 2956–2962
نویسندگان
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