N. Kutlu, M. Yilmaz, H. Arslan, A. Isci, Ozge Sakiyan
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The effect of ohmic heating pretreatment on drying of apple
In this study, effects of ohmic pretreatment on the drying rates and color kinetics of apple were investigated. Apple slices were treated at different electric field strengths (20-30 and 40 V/cm) at 60°C for 1 min. Drying process was applied at 60˚C-2 m/s by using a tray-dryer. ΔE and moisture content were calculated. These values were fitted to the semi-theoretical thin-layer drying and the zero and first-order kinetic model. The shortest drying time was found samples treated with 30 V/cm. Wang&Singh model gave the superior fit to the experimental data. ΔE fitted well to the zero-order kinetic model.Keywords: Ohmic heating, drying, kinetic models, thin-layer models, apple.
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