Interestingly, the lightness of apple slices at drying temperature of 60◦C was higher than the 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 drying temperature of 70◦C and 50◦C, respectively, which led to the darker finished products. Furthermore, it seemed that the