Moisture Sorption Isotherm of C. nutans Herbal Leaves

S. Abdullah, Y. Yusof, N. Shah, F. Salleh, M. Ali, N. Razak
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Abstract

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.
枸杞叶吸湿等温线研究
采用静态失重法建立了在30°C、40°C和50°C 3种不同温度下,水活度在0.3 ~ 0.9之间的吸湿等温线。结果表明,在恒温解吸等温线和吸附等温线上,随着水活度的增加,平衡水分含量增加。相反,平衡水分含量随着温度的升高而降低,在恒定的水活度下,所有等温线。根据brunauer - emmet - teller (BET)分类,吸附等温线表现为ⅲ型或j型曲线。结果表明,Guggenheim-Anderson-de Boer (GAB)模型和Peleg模型最符合实验的水分等温线。解吸和吸附的最大净等容热值分别为70 kJ/mol和13 kJ/mol。建立的吸湿等温线对优化设计核桃干燥机和贮藏条件具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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