Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 80: Issue 2
Thermal stability of food additives of glutamate and benzoate type
Authors:
T. Vlase West University of Timişoara, Faculty of Chemistry-Biology-Geography Str. Pestalozzi No. 16, Timişoara, Romania

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Gabriela Vlase West University of Timişoara, Faculty of Chemistry-Biology-Geography Str. Pestalozzi No. 16, Timişoara, Romania

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N. Doca West University of Timişoara, Faculty of Chemistry-Biology-Geography Str. Pestalozzi No. 16, Timişoara, Romania

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Pages:
425–428
Online Publication Date:
03 May 2005
Publication Date:
01 May 2005
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-005-0671-0
Keywords:
non-isothermal kinetics; isoconversional methods; food additives; compensation effect; non-parametric kinetics (NPK)
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Summary Many years ago, thermal analysis earned its place as a current instrumentation technique in assisting/solving the analytical problems of pharmaceuticals. A relative new trend is the study of the thermal stability of food additives in connection with the molecular structure. The studied compounds were: natrium and potassium glutamate, respectively natrium, potassium and calcium benzoate. The thermogravimetric data (TG) were obtained in dynamic nitrogen atmosphere, with open Pt crucible and heating rates of 5, 7, 10 and 12 K min-1, using a Perkin-Elmer TGA7 equipment. In order to estimate the non-isothermal kinetic parameters, the Friedman's differential-isoconversional method and the method suggested by Budrugeac and Segal (based on the compensation effect) were used. A variation of the activation energy vs. conversion was observed by using Friedman's method. The discrimination between the different reaction steps was performed by the non-parametric kinetic method, suggested by Sempere, Nomen and Serra. This is due to a complex process. The thermal stability data are very important for avoiding a possible misuse by processing of the studied food additives.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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