Thermodynamic properties and moisture sorption isotherms of Matricaria pubescens from Algerian Sahara

Experimental adsorption and desorption behavior of Matricaria pubescens was determined by using the gravimetric static method at 30, 40 and 50 °C, for water activity ranging from 0.057 to 0.898. Experimental data were compared with eight widely recommended sorption models (Caurie, BET, Henderson-Thomson, Smith, Halsey, Oswin, Peleg, and Adam and Shove) in literature. Peleg and Halsey models were found to be the most suitable for describing sorption isotherm curves. The net isosteric heats of sorption were also calculated by using the Clausius-Clapeyron equation