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Thermal behavior of cashew gum by simultaneous TG/DTG/DSC-FT-IR and EDXRF

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Abstract

Cashew gum, an exudate polysaccharide from Anacardium occidentale L., was purified by alcohol precipitation. Thermal behavior of this polysaccharide was investigated by simultaneous TG/DTG/DSC-FT-IR analysis performed under nitrogen and air atmospheres and heating rate of 10 K min−1. TG/DTG curves under oxidative atmosphere were similar to the curves under N2 atmosphere until 340 °C, however, it was observed a profile difference due to the presence of two DTG peaks at 430 and 460 °C. DSC results showed endothermic and exothermic events corroborating with TG/DTG curves. The Simultaneous TG/DSC-FTIR analysis revealed that evolved gases from the decomposition of cashew gum sample were CO2, CO, and groups: O–H, C–H, C=O, C–C, and C–O, in nitrogen and air atmospheres. Energy dispersive X-ray fluorescence analysis from the ash showed that the elements in larger amounts are CaO, MgO, and K2O.

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Acknowledgements

The authors would like to thank Brazilian Agency: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for their financial support.

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Authors and Affiliations

  1. Department of Organic Processes, School of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, 21941-900, Brazil

    Cheila Gonçalves Mothé & Jaqueline Souza de Freitas

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  1. Cheila Gonçalves Mothé
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  2. Jaqueline Souza de Freitas
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Correspondence to Cheila Gonçalves Mothé.

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Mothé, C.G., de Freitas, J.S. Thermal behavior of cashew gum by simultaneous TG/DTG/DSC-FT-IR and EDXRF. J Therm Anal Calorim 116, 1509–1514 (2014). https://doi.org/10.1007/s10973-014-3788-1

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  • DOI: https://doi.org/10.1007/s10973-014-3788-1

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