Determination of EMC isotherms and appropriate mathematical models for canola

作者：Zomorodian Ali^*; Kavoosi Zahra; Momenzadeh Leila

来源：Food and Bioproducts Processing, 2011, 89(C4): 407-413.

DOI：10.1016/j.fbp.2010.10.006

• Canola
• Equilibrium moisture content
• Relative humidity
• Modeling
• Sorption isotherm

Canola seed needs to be dried to minimize damage during subsequent unit operations. In order to optimize the drying and storage processes of seeds it is necessary to know the equilibrium moisture content at different air equilibrium relative humidities and temperatures. In the present work adsorption equilibrium moisture content isotherms were determined for a specific local canola variety at 25, 40 and 55 degrees C and seven air relative humidifies within the range of 11-90%. Experimental data were used to model the adsorption isotherm process using non-linear regression analysis. Thirteen available mathematical and semi empirical models were employed to find the best fit isotherm curve model. The Halsey model showed the best results at 25 and 40 degrees C and the values of coefficient of determination (R-2), chi-square (7,2) and root of mean square error (RMSE) were 0.993, 0.122 and 0.295 at 25 degrees C and 0.994, 0.042 and 0.174 at 40 degrees C. Another best fit mode was the GAB model at 55 degrees C which resulted in the values of 0.997, 0.023 and 0.120 for R-2, chi(2) and RMSE respectively. The adsorption monolayer moisture content (m(0)) was also evaluated using BET equation. The m(0) values at 25 degrees C, 40 degrees C and 55 degrees C were 0.017, 0.016 and 0.015 g H2O/g solid and the corresponding constant values of the BET equation were found to be -4.733, -5.129 and -10.299 respectively.

• 出版日期2011-10