African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12254

Full Length Research Paper

Determining water content and other impurities in Siparuna guianensis Aublet essential oil using differential scanning calorimetry

Augustus Caeser Franke Portella
  • Augustus Caeser Franke Portella
  • Universidade Federal do Tocantins, Departamento de Ciências Exatas, Campus Universitário de Gurupi, Gurupi, Tocantins, Brazil
  • Google Scholar
Marilda Munaro
  • Marilda Munaro
  • Departamento de Tecnologia de Materiais, Instituto de Tecnologia para o Desenvolvimento, LACTEC, CP 19067, 81531-980 Curitiba – PR, Brazil.
  • Google Scholar
Chrystian de Assis Siqueira
  • Chrystian de Assis Siqueira
  • Universidade Federal do Tocantins, Departamento de Ciências Exatas, Campus Universitário de Gurupi, Gurupi, Tocantins, Brazil
  • Google Scholar
Kleber Franke Portella
  • Kleber Franke Portella
  • Departamento de Tecnologia de Materiais, Instituto de Tecnologia para o Desenvolvimento, LACTEC, CP 19067, 81531-980 Curitiba – PR, Brazil.
  • Google Scholar
Magnólia de Mendonca Lopes
  • Magnólia de Mendonca Lopes
  • Universidade Federal do Tocantins, Departamento de Ciências Exatas, Campus Universitário de Gurupi, Gurupi, Tocantins, Brazil
  • Google Scholar
Alex Sander Rodrigues Cangussu
  • Alex Sander Rodrigues Cangussu
  • Universidade Federal do Tocantins, Departamento de Ciências Exatas, Campus Universitário de Gurupi, Gurupi, Tocantins, Brazil
  • Google Scholar
Raimundo Wagner de Souza Aguiar
  • Raimundo Wagner de Souza Aguiar
  • Universidade Federal do Tocantins, Departamento de Ciências Exatas, Campus Universitário de Gurupi, Gurupi, Tocantins, Brazil
  • Google Scholar


  •  Received: 19 March 2015
  •  Accepted: 31 August 2015
  •  Published: 30 March 2016

Abstract

Siparuna guianensis Aublet is a predominant species in the Brazilian Cerrado. Some studies found that its essential oil has properties that could be useful for manufacturing new products. Its quality depends on physicochemical properties, since its degradation, as well as water content and other volatile materials may cause several changes in its features. The differential scanning calorimetry (DSC) was used to determine the water content in the S. guianensis essential oil in order to evaluate its thermal parameters. The method is based on the hypothesis that the desolvation enthalpy (∆Hdesol) needed for removing n water moles from the essential oil is approximately the enthalpy needed for melting the same n water moles (n∆Hf). Thus, the current study considers the dissociation enthalpy (∆Hdiss) to be negligible. The total number of moles was calculated from the molecular mass value of the main essential oil components mentioned in the literature. The DSC curve in nitrogen atmosphere indicated the melting temperature of 1.6°C (ΔH=18.95 Jg-1). Based on the dehydration enthalpies demonstrated in the DSC curve, it was possible to infer that the calculations on the number of water moles and other constant volatile materials found in the S. guianensis essential oil were compatible with Karl Fischer Titration (KFT) method. This method is commonly used to determine the water content in substances.

 

Key words: Siparuna guianensis, differential scanning calorimetry, thermogravimetric analyses.

Abbreviation

DSC, Differential scanning calorimetry; KFT, Karl Fischer titration; TG, thermogravimetric analysis.