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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Bibliographic Details
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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Summary: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.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2008.01.002