Vitamin C (ascorbic acid) is usually selected as an index of the nutrient quality because of its labile nature as compared to the other nutrients in foods.Degradation of ascorbic acid depends on several factors, which include oxygen,metal ion catalysis, light, temperature and moisture content.The absence of air during drying may inhibit oxidation, and therefore,color and nutrient content of products can be largely preserved. The solubility of vitamin C in water ients may cause problems during the preservation of foods.Oxidation of food ingredients such as vitamins, pigments and aroma compounds is one of the most important causes of quality loss during food processing and is the main deteriorative reaction in microbiologicallysafe foods like dry and frozen products.