Premium
Oleoylation of sugarcane bagasse hemicelluloses using N ‐bromosuccinimide as a catalyst
Author(s) -
Sun XaioFeng,
Sun RunCang,
Sun JingXia
Publication year - 2004
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.1735
Subject(s) - chemistry , bagasse , catalysis , chloride , nuclear chemistry , thermal stability , hemicellulose , organic chemistry , yield (engineering) , cellulose , materials science , microbiology and biotechnology , biology , metallurgy
Conditions for the preparation of esters of sugarcane bagasse hemicelluloses with oleoyl chloride using N ‐bromosuccinimide (NBS) as a catalyst in the N , N ‐dimethylformamide/lithium chloride system under mild conditions were studied comparatively. The oleoylation was followed in terms of yield and degree of substitution (DS). The parameters optimised included oleoyl chloride concentration as the molar ratio of oleoyl chloride/anhydroxylose units in native hemicelluloses (1:1–8:1), NBS concentration (0.5–3.0%), reaction time (20–100 min) and reaction temperature (30–100 °C). Results were also compared with those for other catalysts such as H 2 SO 4 and four tertiary amine catalysts, pyridine, 4‐dimethylaminopyridine, N ‐methyl pyrrolidine and N ‐methyl pyrrolidinone. An oleoyl chloride/hemicellulose molar ratio of 3:1 was found to be necessary for the reaction to proceed smoothly and to yield a product with a low DS. The new materials were characterised by FT‐IR and 1 H and 13 C NMR spectroscopies as well as thermal analysis. The thermal stability of the oleoylated hemicelluloses decreased slightly upon chemical modification, but no significant further decrease in thermal stability was observed for DS ≥ 0.29. Copyright © 2004 Society of Chemical Industry