Moisture sorption isotherms and heat of sorption of Algerian bay leaves (Laurus nobilis)

Abstract

The moisture sorption isotherms of Algerian bay leaves (Laurus nobilis) were determined experimentally in this work. The equilibrium moisture contents of the leaves were measured at 40, 50, and 60 °C using static gravimetric method. Six mathematical models were tested to fit the experimental data of sorption isotherms and predict the hygroscopic behavior during storage or drying. Peleg model was found to be the best fitting model for describing the sorption curves. The net isosteric heat of sorption was computed from the equilibrium data at different temperatures by applying the integrated form of the Clausius-Clapeyron equation.The net isosteric heat of sorption is inversely proportional to the equilibrium moisture content and is found to be an exponential function of moisture content.

Techno‐functional and sorption isotherms characteristics of Cucumis melo peels: Toward the processing to predict shelf‐life stability

“…When the temperature rises, the X e decreased for given a w , indicating thus that melon peels became less hygroscopic at higher temperature. Same finding was recorded by Ouafi et al (2015) and Gichau et al (2020). At increased temperatures, molecules were in a high state of excitation, which decreases the attractive forces between water molecules and sorption sites (Ouafi et al, 2015).…”

Sorption behavior of four tropical woods using a dynamic vapor sorption standard analysis system

“…The Hailwood-Horrobin sorption model (HH-model) (Hailwood and Horrobin 1946) and the Guggenheim, Anderson and De Boer-Dent model (GAB-model) (Ouafia et al 2015) are used for describing the envelope curves (desorption and adsorption isotherms from the extreme values 0% and 90% of RH) because the agreement of the measured values with the computed isotherms are usually very good (Fernández et al 2014, Popper et al 2009). Mathematical equations of these models are briefly recalled on Table 1.…”

“…Equilibrium moisture content model HH-model (Hailwood and Horrobin 1946) GAB-model (Ouafia et al 2015) With:…”

“…In the literature, several authors use the standard static gravimetric method to determine the sorption isotherms (Ouafia et al 2015). Description of this method is available on Jannot (2008).…”

“…It can be used to determine the net isosteric heat of sorption (Ouafia et al 2015), for selecting appropriate storage conditions and packing systems that optimize or maximize the mechanical stability of biological material.…”