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Rapid esterification of wheat straw hemicelluloses induced by microwave irradiation

Esterification of wheat straw hemicelluloses with acetyl chloride, propionyl chloride, n-octanoyl chloride, lauroyl chloride, palmitoyl chloride, stearoyl chloride, and oleoyl chloride, respectively, using N-bromosuccinimide (NBS) as a catalyst was achieved in DMF/LICl medium by microwave irradiatio...

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Published in:	Carbohydrate polymers 2008-09, Vol.73 (4), p.612-620
Main Authors:	Xu, Feng, Jiang, Jian-Xing, Sun, Run-Cang, She, Dai, Peng, Bai, Sun, Jin-Xia, Kennedy, John F.
Format:	Article
Language:	English
Subjects:	13C NMR acyl chlorides Applied sciences biopolymers Cellulose and derivatives chemical structure Esterification Exact sciences and technology hemicellulose Hemicelluloses Microwave microwave radiation Natural polymers Physicochemistry of polymers Thermal stability wheat straw
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creator	Xu, Feng Jiang, Jian-Xing Sun, Run-Cang She, Dai Peng, Bai Sun, Jin-Xia Kennedy, John F.
description	Esterification of wheat straw hemicelluloses with acetyl chloride, propionyl chloride, n-octanoyl chloride, lauroyl chloride, palmitoyl chloride, stearoyl chloride, and oleoyl chloride, respectively, using N-bromosuccinimide (NBS) as a catalyst was achieved in DMF/LICl medium by microwave irradiation. The effects of various acyl chlorides and the molar ratios of xylose units in hemicelluloses/acyl chloride on the degree of substitution (DS) were investigated and DS reached up to 1.34 by a few minutes. 13C NMR studies showed that the esterification occurred preferentially at the C-3 and C-2 positions. On the other hand, microwave irradiation brought a partial degradation of the polymer, and therefore resulted in a slight decrease in thermal stability of the hemicellulosic derivatives in comparison with conventional heating technique.
doi_str_mv	10.1016/j.carbpol.2008.01.002
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The effects of various acyl chlorides and the molar ratios of xylose units in hemicelluloses/acyl chloride on the degree of substitution (DS) were investigated and DS reached up to 1.34 by a few minutes. 13C NMR studies showed that the esterification occurred preferentially at the C-3 and C-2 positions. 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The effects of various acyl chlorides and the molar ratios of xylose units in hemicelluloses/acyl chloride on the degree of substitution (DS) were investigated and DS reached up to 1.34 by a few minutes. 13C NMR studies showed that the esterification occurred preferentially at the C-3 and C-2 positions. 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subjects	13C NMR acyl chlorides Applied sciences biopolymers Cellulose and derivatives chemical structure Esterification Exact sciences and technology hemicellulose Hemicelluloses Microwave microwave radiation Natural polymers Physicochemistry of polymers Thermal stability wheat straw
title	Rapid esterification of wheat straw hemicelluloses induced by microwave irradiation
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