Thermal behavior of glutamic acid and its sodium, lithium and ammonium salts

被引：26

作者：

Nunes, R. S. ^{[1
]}

Cavalheiro, E. T. G. ^{[1
]}

机构：

[1] USP, Inst Quim Sao Carlos, Dept Quim & Fis Mol, BR-1356970 Sao Carlos, SP, Brazil

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2007年 / 87卷 / 03期

关键词：

food additives; glutamate alkaline salts; thermal stability;

D O I：

10.1007/s10973-006-7788-7

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Glutamic acid (H(2)glu) and its lithium, sodium and ammonium monosalts were submitted to thermal analysis using thermogravimetry (TG) and differential thermal analysis (DTA). The main goal of these studies was to compare the relative thermal stability and to evaluate the effect of the counter ion in the thermal decomposition pathways. Salts were obtained by direct neutralization of the purified acid with LiOH, NaOH or NH4OH and were characterized by elemental analysis (C, H and N) and IR spectroscopy. Decomposition occurred after conversion to the pyroglutamic acid or the respective pyroglutamates and ammonium salt loosing NH3 being converted to H(2)glu before decomposition.

引用

页码：627 / 630

页数：4

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