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Formation of the main degradation compounds from arabinose,xylose, mannose and arabinitol during pyrolysis
Authors:Räisänen  U  Pitkänen  I  Halttunen  H  Hurtta  M
Institution:1.Department of Chemistry, University of Jyv?skyl?, P.O. Box 35, Fin-40014, Jyv?skyl?, Finland
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Abstract:The thermochemical behaviour of sugars (D- and DL-arabinose, D- and DL-xylose and D-mannose) and sugar alcohol (D- and DL-arabinitol) was investigated by TG and pyrolysis-gas chromatography with mass-selective detection (Py-GC/MSD). The temperature of pyrolysis was 500 and 550°C. The TG-curves were measured both in air and nitrogen atmospheres, from 25 to 700°C with the heating rate of 2°C min-1. In each case, the main pyrolysis products were classified into the following compound groups: (i) furanes, (ii) pyranes, (iii) cyclopentanes, (iv) cyclohexanes, (v) anhydroglucopyranoses, (vi) dianhydroglucopyranoses and (vii) saturated fatty acids. For example, the main peaks of the chromatograms of pentoses (arabinose, xylose), hexose (mannose) and sugar alcohols (arabinitols) were different. The greatest peak of pentoses in gas-chromatogram was 2-furancarboxaldehyde and that of hexose was (2H)-furan-3-one. The greatest peak of arabinitols at pyrolysis temperature of 500°C was furan methanol and at 550°C a-angeligalactone. 5-hydroxymethyl-2-furan carboxaldehyde was found only in the pyrolysis of D-mannose (hexose). The former study showed that it was not found in pyrolysis of pentoses. The amount of CO2 and H2O was not determined. This revised version was published online in July 2006 with corrections to the Cover Date.
Keywords:pyrolysis  arabinitol  xylose  mannose  pentose  thermal decomposition  arabinose  hexose  sugar alcohol
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