In food chemistry, peroxidase are considered as reference enzymes for blanching process because of their high thermal resistance and vast abundance in many vegetables and fruits [6]. Blanching is a thermal treatment commonly employed for the inactivation of enzymes that can affect the quality of the food products during storage. Enzymes such as polyphenoloxidases, peroxidase, lipoxygenase and phenolase can lead to the initiation of deterioration reactions such as, undesirable color, flavor and nutritional changes. To overcome these undesirable changes heat treatment is being used for enzyme inactivation in the preservation of many fresh foods. However, excessive heat treatment damages the nutrients in the extract rigorously [7], therefore for the inactivation of peroxidase in different fruits, different blanching temperatures and times are used. The proposed method is particularly useful to design the appropriate time and temperature for blanching of sapota and fig fruits.