Formation of the main degradation compounds from arabinose, xylose, mannose and arabinitol during pyrolysis
Formation of the main degradation compounds from arabinose, xylose, mannose and arabinitol during pyrolysis
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DOI：
10.1023/a:1024557011975
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发表时间：
2003-05
影响因子：
4.4
通讯作者：
U. Räisänen;I. Pitkänen;H. Halttunen;M. Hurtta
中科院分区：
文献类型：
--
作者：
U. Räisänen;I. Pitkänen;H. Halttunen;M. Hurtta
本文用热重分析和裂解气相色谱质谱联用技术（Py-GC/MSD）研究了糖（D-和DL-阿拉伯糖、D-和DL-木糖和D-甘露糖）和糖醇（D-和DL-阿拉伯糖醇）的热化学行为。热解温度为500和550°C。在空气和氮气气氛中，从25 ° C至700°C，以2°C min-1的加热速率测量TG曲线。在每种情况下，主要的热解产物分为以下化合物组：（i）呋喃，（ii）吡喃，（iii）环戊烷，（iv）环己烷，（v）脱水吡喃葡萄糖，（vi）二脱水吡喃葡萄糖和（vii）饱和脂肪酸。例如，戊糖（阿拉伯糖、木糖）、己糖（甘露糖）和糖醇（阿拉伯糖醇）色谱图的主峰不同。气相色谱中戊糖的最大峰为2-呋喃甲醛，己糖的最大峰为（2 H）-呋喃-3-酮。在500°C的热解温度下，阿拉伯糖醇的最大峰是呋喃甲醇，在550°C下是α-当归内酯。5-羟甲基-2-呋喃甲醛仅在D-甘露糖（己糖）的热解中发现。前期的研究表明，在戊糖的热裂解过程中没有发现它的存在。未测定CO2和H2O的量。
The thermochemical behaviour of sugars (D- andDL-arabinose,D- andDL-xylose andD-mannose) and sugar alcohol (D- andDL-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 ofD-mannose (hexose). The former study showed that it was not found in pyrolysis of pentoses. The amount of CO2and H2O was not determined.