Moisture Sorption Isotherms And Thermodynamic Properties Of Urtica Dioica Leaves

  • Abdelkader Lamharrar Laboratory of Solar Energy and Medicinal Plants, Teacher's Training College, Cadi Ayyad University, Marrakesh, Morocco
  • Ali Idlimam Laboratory of Solar Energy and Medicinal Plants, Teacher's Training College, Cadi Ayyad University, Marrakesh, Morocco
  • Mohammed Kouhila Laboratory of Solar Energy and Medicinal Plants, Teacher's Training College, Cadi Ayyad University, Marrakesh, Morocco
  • Lamya Lahnine ERIDDECV (Research Team of Innovation and Sustainable Development & Expertise in Green Chemistry), Department of Chemistry, Cadi Ayyad University, Marrakesh 40000, Morocco
  • Hind Mouhanni Higher Institute of Marine Fisheries, Agadir, Morocco

Abstract

Urtica dioica is a Moroccon endemic plant of used for its virtues in traditional medicine. Thus, it is necessary to study the effect of preservation processes on the storage conditions of the plant. The static gravimetric method was used to determine sorption isotherms of Urtica dioica leaves at three temperatures (40, 50 and 60 °C) and in the range of water activity ( w a ) ranging from 0.0572 to 0.898. Six mathematical models were used to fit the experimental data. The Enderby and Peleg models were found to be the most suitable for describing the sorption curves. The optimal water activity for conservation of Urtica dioica leaves was determined. Isosteric heats of desorption and adsorption were calculated by applying the Clausius- Clapeyron equation to the sorption isotherms at different temperatures; it decreased with increasing moisture content. A linear relation exists between the enthalpy and entropy of the sorption reaction.

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Published
2016-08-30
How to Cite
Lamharrar, A., Idlimam, A., Kouhila, M., Lahnine, L., & Mouhanni, H. (2016). Moisture Sorption Isotherms And Thermodynamic Properties Of Urtica Dioica Leaves. European Scientific Journal, ESJ, 12(24), 376. https://doi.org/10.19044/esj.2016.v12n24p376