Moreover, the product lightness dramatically increased after moisture ratio of 0.7 toward the end of drying process. Itcould be attributed to a decrement in the brown pigmentformation (Baini and Langrish, 2009) and a cessation in thenon-enzymatic browning due to lower moisture content ofsamples at falling rate period. Interestingly, the lightness ofapple slices at drying temperature of 60◦C was higher thanthe processed ones under drying air temperatures of 50 and70◦C (Fig. 5). It could be probably related to the intensive Mail-lard reaction and the prolonged processing duration at dryingtemperature of 70◦C and 50◦C, respectively, which led to thedarker finished products. Furthermore, it seemed that the