Phenolic acids, mainly chlorogenic acids is consisted of up to 90% of the total polyphenol content in potatoes (Andre et al., 2007). Phenolic compounds are mostly distributed between the potato cortex and skin (peel) tissues (Friedman, 1997). About 50% of the phenolic compounds are located in the potato peel and adjoining tissues, while the rest decrease in concentration from the outside toward the center of potato tubers (Hasegawa et al., 1966). The health-promoting effects of potatoes are also very promising for humans since a recent study showed that the consumption of unpeeled cooked potatoes improves the lipid metabolism and antioxidant status (Robert et al., 2006). Phenolic acids usually occur in a form bound to the cell wall’s sugars, organic acids or carbohydrates.