TAC of osmotic dehydrated purple sweet potatoes that infused with CaCl2 is shown in Figure 9. TAC was decreased when concentration of sucrose and CaCl2 were increased. The lowest TAC (90.68 mg/L) found in the potato samples, which were treated with 60% sucrose solution that infused with 4% CaCl2. The highest TAC found in the potato samples that treated with 40% sucrose solution with no CaCl2 infused and the values were 185.02 mg/L, respectively. The sucrose solutions that were not infused with CaCl2 found effectively retained the TAC in the potatoes. Anthocyanins are a class of flavonoides that are soluble in water. They exist in epidermal and sub epidermal cells and dissolved in vacuoles or accumulated in vesicles called anthocyanoplasts and therefore they can leak into the osmotic medium through the cuticle and skin ruptures of fruit. Layers of epidermal and subepidermal might be ruptured during osmosis due to the osmotic pressure gradient. The anthocyanin isn’t stable and it could affect by pH, light, heat, oxygen, metal ions like iron, copper and tin, sugar, electromagnetic waves and etc. Patil et al. (2009) reported that the anthocyanin contents of berries were influenced by the parameters of the osmotic process (sucrose concentrations, temperature) and there fure, the anthocyanin contents could be changed as the result of osmosis parameters changes. This finding is in an accord with present study, where increasing concentration of sucrose and CaCl2 in the osmotic solution could alter the level of TAC in the samples.