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《Acta Agrestia Sinica》 2017-04
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Water Desorption Isotherm Models and Parameters Optimization of Alfalfa(Medicago sativa)Stems and Leaves

GAO Dong-ming;HUANG Zhi-gang;LI jie;WANG De-cheng;College of Material and Mechanical Engineering,Beijing Technology and Business University;College of Engineering,China Agricultural University;  
In order to achieve the basic data for alfalfa drying process and storage stability,desorption isotherm characteristics of alfalfa stems and leaves were determined using mirror condensation dew point method at different temperatures(20,30,and 40℃,respectively).Five common models were used to fit the experimental data in non-linear regression analysis.The fitness of the models and their parameters were evaluated using Fitting Goodness and residual distribution.Based on these expressions,parameters of the models were optimized and modified to achieve the best-fit model and its parameters.The results indicated that the leaves desorption isotherm belonged to type II,but the adsorption isotherm of stems was type III.Under the same conditions of water activity,safe moisture contents were significantly different between alfalfa stems and leaves.The requirements of safe moisture content were also different in different storage temperatures.Under the same moisture content condition,the lower ambient temperature corresponded to the safe storage.The modified GAB were the best fitting desorption isotherm models for alfalfa leaves,and the best model fitted for the desorption isotherm of top stem was GAB and Henderson model.The GAB and Oswin were found to be the most suitable models for describing the lower stems under three temperatures(20,30 and 40℃).
【Fund】: 公益性行业(农业)科研专项经费项目(201203024)资助
【CateGory Index】: S541.9
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