Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 118, Issue -, Pages 317-324Publisher
ELSEVIER
DOI: 10.1016/j.jaap.2016.02.015
Keywords
Tetracycline; Chlortetracycline; Thermal behavior; Coupled thermogravimetry-infrared spectroscopy
Funding
- FAPESP [2012/09911-3]
- CNPq
- PRP/USP
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The thermal behavior of tetracycline hydrochloride (TC) and chlortetracycline hydrochloride (CTC) antibiotics was evaluated using thermoanalytical techniques TGA-DTA, DSC and evolved gas analysis by TGA-FTIR, providing information regarding thermal stability, decomposition steps and melting. TGA-FTIR revealed hydrochloric acid, water, isocyanic acid, dimethylamine, methane as main decomposition products for both antibiotics. Ammonia and carbon dioxide from the decomposition of the isocyanic acid have also been detected. According to DSC data the melting process occurred just before decomposition at 220.9 degrees C for TC. Tentative mechanisms for the thermal behavior of TC and CTC are presented. (C) 2016 Elsevier B.V. All rights reserved.
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