Decomposing or subliming? An investigation of thermal behavior of L-leucine
Decomposing or subliming? An investigation of thermal behavior of L-leucine
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DOI：
10.1016/j.tca.2006.05.004
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发表时间：
2006-08-15
影响因子：
3.5
通讯作者：
Wang, Cunxin
中科院分区：
文献类型：
--
作者：
Li, Jie;Wang, Zhiyong;Wang, Cunxin
用TGA、FTIR和TG-FTIR研究了L亮氨酸在惰性条件下的热行为。热重分析结果表明，L亮氨酸在30~600℃的程序升温过程中只发生了一个失重阶段，失重达99%以上。用主曲线法求出了表观活化能、指前因子和最可几模型函数。动力学研究结果表明，L亮氨酸的质量下降是由于升华而不是分解所致。FTIR光谱分析和直接观察到的升华现象证明了这一点。TG-FTIR实验结果表明，亮氨酸升华后只有一个分解阶段。气体产物为CO2、NH3、CO和3-甲基-1-丁胺等有机化合物，主要初级分解为脱羧基。(C)2006爱思唯尔B.V.保留所有权利。
The thermal behavior of L-leucine under inert conditions was investigated by TGA, FTIR and TG-FTIR. The TG results showed that only one mass loss stage of more than 99% happened when L-leucine was under program heating with temperature ranging from 30 to 600 degrees C. The apparent activation energy, pre-exponential factor and the most probable model function were obtained by using of master plots method. The results of kinetic study showed that the decrease in mass of L-leucine was due to subliming rather than decomposing. And this was proved by the FTIR spectrum analysis and the directly observed subliming phenomenon. The results of TG-FTIR experiments showed that there was only one stage of decomposition process that happened after the subliming of leucine. The gas products were CO2, NH3, CO and some organic compounds such as 3-methyl-1-butanamine, and the main primary decomposition was decarboxylation. (C) 2006 Elsevier B.V. All rights reserved.