Water activity (a_w) of osmotically dehydrated and CaCl_2 infused purple sweet potatoes are shown in Figure 3. a_w was decreased in the samples during storage under both temperature (4˚C & RT). a_w of purple sweet potatoes that were undergone for osmotic process the highest level was found in the potatoes samples (0.9500) at room temperature storage was ranged lowest (0.9343) and storage at 4˚C was ranged lowest (0.9400). a_w of osmotically dehydrated purple sweet potatoes during storage was significantly differed under different temperature storage. The samples storage at room temperature was losing a_w more quickly when compared with 4˚C. Add sucrose solution and CaCl_2 infused purple sweet potatoes make the lower a_w.
The highest level was found in the potatoes samples of pH