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Master's Dissertation
DOI
https://doi.org/10.11606/D.75.2018.tde-10102018-165842
Document
Author
Full name
Caroline Bevilacqua Micalli
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2018
Supervisor
Committee
Cavalheiro, Eder Tadeu Gomes (President)
Plepis, Ana Maria de Guzzi
Ribeiro, Clovis Augusto
Tiera, Vera Aparecida de Oliveira
Title in Portuguese
Estudo do comportamento térmico dos antibióticos aminoglicosí­deos estreptomicina e tobramicina
Keywords in Portuguese
aminoglicosídeos
análise térmica
estreptomicina
mecanismo de composição
tobramicina
Abstract in Portuguese
Este trabalho propõe estudos sobre a caracterização do comportamento térmico dos aminoglicosídeos estreptomicina e tobramicina, que são antibióticos bactericidas, utilizados no combate a microorganismos patogênicos, que agem interrompendo a síntese de proteínas. Após a caracterização espectroscópica dos analitos, foram realizadas medidas termogravimétricas, em atmosfera de ar e nitrogênio, que possibilitaram a determinação da estabilidade térmica do fármaco e o reconhecimento das etapas de decomposição. A calorimetria exploratória diferencial forneceu informações a respeito de processos físicos com variação de entalpia. Os gases envolvidos foram analisados usando termogravimetria acoplada à espectroscopia vibracional na região do infravermelho (TG-FTIR), possibilitando a proposta de um mecanismo para sua decomposição térmica. Intermediários de decomposição térmica foram caracterizados por CG-MS e o conjunto de todas essas informações forneceu um possível mecanismo para o comportamento térmico dessas drogas. Também foi sintetizado, caracterizado e analisado por TG, DSC e TG-FTIR, o complexo de tobramicina com o íon Cu+2.
Title in English
The study of the thermal behavior of the aminoglycoside antibiotics streptomycin and tobramycin
Keywords in English
aminoglycosides
decomposition mechanism
streptomycin
thermal analysis
tobramycin
Abstract in English
A study regarding the thermal behavior characterization of the aminoglycosides streptomycin and tobramycin which are bactericidal antibiotics is presented. These antibiotics are widely against pathogenic microorganisms and act by interrupting the synthesis of proteins. Thermogravimetric measurements were performed under air and nitrogen conditions. To evaluate thermal stability of the drugs and their decomposition steps. A differential scanning calorimetry provided information on physical processes with enthalpy change. Evolved gas analysis was performed using thermogravimetry coupled to infrared spectroscopy (TG-FTIR), and was used to characterize the gases released during the thermal heating of the samples. Decomposition intermediates were characterized by CG-MS and the set of all these resultsallowed the proposition of a mechanism for the thermal behavior of drugs. The complex of tobramycin with the Cu+2 ion was also synthesized, characterized and analyzed by TG, DSC and TG-FTIR.
 
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Publishing Date
2018-10-16
 
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