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Title of Journal: J Therm Anal Calorim

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Abbravation: Journal of Thermal Analysis and Calorimetry

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Springer Netherlands

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DOI

10.1016/j.ajog.2005.10.618

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1588-2926

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Synthesis characterization and thermal analysis

Authors: Rita de Cássia da Silva Éder Tadeu Gomes Cavalheiro
Publish Date: 2014/07/22
Volume: 120, Issue: 1, Pages: 855-862
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Abstract

Characterization thermal stability and thermal decomposition of a reaction product between alginic acid Halg and monoethanolamine Mea and of these complexes with drugs were investigated employing elemental analysis thermogravimetry TG infrared spectroscopy FTIR TGFTIR differential scanning calorimetry and nuclear magnetic resonance NMR spectroscopy to carbon 13C NMR The drugs used were acetaminophen Apap thioconazole Thio and ramipril Ram All the compounds were obtained in the hydrated state and the thermal decomposition occurs in two steps for complexes after dehydration Elemental analysis and TG results suggested that the Meaalg have 11  hydration water with general formula C8H13O6N·54H2O The TG curve profile showed that sample decomposed in two steps after dehydration with formation of carbonaceous residue FTIR revealed some evidences that the Meaalg is a mixture of salt and ester TGFTIR showed that the gaseous products evolved during the thermal decomposition were ammonia water and CO2 From NMR13C it was possible to find substitution degree 77  of Meaalg In the characterization of complexes it was possible to conclude that the interaction mechanism between drugs and Meaalg is dependent on the characteristics of the molecules such as size and functional groups

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