Determination of moisture desorption isotherm curves of Bidens bipinnata L. leaves and stems

Yousefi, Leila

doi:10.48311/fsct.2026.118231.82984

Determination of moisture desorption isotherm curves of Bidens bipinnata L. leaves and stems

Document Type : Original Article

Author

Leila Yousefi

Department of Chemistry, Isl.C., Islamic Azad University, Islamshahr, Iran.

10.48311/fsct.2026.118231.82984

Abstract

Determining the product's moisture desorption isotherm curves is essential in order to estimate the drying time, the moisture reduction rate, and consequently estimate the dryer capacity and save time and energy consumption. Therefore, in the present study, the moisture desorption isotherm curves of Bidens bipinnata L. were determined at 30, 40, 50, and 60 °C and water activity ranging from 11-85 by using the gravimetric static method, and the Chung-Pfost, Halsey, Henderson, Oswin, and GAB mathematical models were used to evaluate the experimental data. According to the results, at a given water activity, the equilibrium moisture content decreased with increasing temperature, but at each temperature, the equilibrium moisture content of the samples increased with increasing water activity. Also, the Halsey model had a better fit than other models due to the high value of R2 and the lower values of MRD, RSS, and SEE, and it can be used to estimate the equilibrium moisture content of samples at different temperatures and relative humidities.

Keywords

Bidens bipinnata L

Isotherm

Equilibrium moisture

Halsey model

Desorption

Subjects

Drying, frying, freezing, osmotic dehydration

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