Moisture sorption isotherm of C. nutans herbal leaves

• Main Authors: Abdullah, Sriyana, Yusof, Yus Aniza, Abdul Karim Shah, Nor Nadiah, Mohd Salleh, Faiqa Shazeaa, Ali, Muhammad Azhar, Abdul Razak, Norawanis
• Format: Article
• Published: EJournal Publishing 2023
• Online Access: http://psasir.upm.edu.my/id/eprint/108568/; https://www.joaat.com/article/421
• Institution: Universiti Putra Malaysia

The moisture sorption isotherms of Clinacanthus nutans (C. nutans) herbal leaves were established at three different temperatures of 30°C, 40°C, and 50°C, and water activity between 0.3–0.9 using a static gravimetric method. The results showed that equilibrium moisture content of C. nutans increased with increasing water activity at a constant temperature for both desorption and adsorption isotherms. In contrast, the equilibrium moisture content decreased when the temperature increased at a constant water activity for all isotherms. The sorption isotherms exhibited Type III behaviour or J-shaped curve according to Brunauer-Emmett-Teller (BET) classification. It was found that Guggenheim-Anderson-de Boer (GAB) and Peleg models were the best-fit to the experimental moisture isotherms. The maximum net isosteric heat of sorption values were found to be 70 kJ/mol and 13 kJ/mol for desorption and adsorption respectively. The moisture sorption isotherms established are essential for optimum design of C. nutans dryer and storage conditions.