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Thermodynamic analysis of sorption isotherms of cassava (Manihot esculenta)

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Abstract

Sorption isotherms of cassava were determined experimentally using a static gravimetric method at 30, 45 and 60 °C and within the range of 0.10–0.90 water activity. At a constant water activity, equilibrium moisture content decreased with increasing temperature. The equilibrium moisture content increased with increasing water activity at a given temperature. The experimental results were modelled using seven sorption models using non-linear regression technique. Results demonstrated that the GAB model adequately predicted equilibrium moisture content of cassava for the range of temperatures and water activities studied. The thermodynamic functions such as net isosteric heat of sorption, differential entropy of sorption, net integral enthalpy and entropy were evaluated to provide an understanding of the properties of water and energy requirements associated with the sorption behaviour. Net isosteric heat and differential entropy decreased with increasing equilibrium moisture content. The net integral enthalpy decreased while net integral entropy increased with increasing equilibrium moisture content. Net integral entropy was negative in value. All thermodynamic functions were adequately characterised by a power law model. The point of maximum stability was found between 0.053 and 0.154 kg water/kg db for cassava.

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  1. Laboratoire d’Energie Solaire, Université de Cocody- Abidjan, 22 BP 582, Abidjan, 22, Côte d’Ivoire

    Blaise Kamenan Koua & Siaka Toure

  2. Laboratoire d’Energie Nouvelle et Renouvelable, Institut National Polytechnique Félix HOUPHOUET – BOIGNY de Yamoussoukro, BP 581, Yamoussoukro, Côte D’Ivoire

    Paul Magloire Ekoun Koffi & Prosper Gbaha

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  1. Blaise Kamenan Koua
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  2. Paul Magloire Ekoun Koffi
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Koua, B.K., Koffi, P.M.E., Gbaha, P. et al. Thermodynamic analysis of sorption isotherms of cassava (Manihot esculenta) . J Food Sci Technol 51, 1711–1723 (2014). https://doi.org/10.1007/s13197-012-0687-y

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