Fresh fruit tissues turn brown when bruised, cut, or otherwise damaged harvesting and post harvest hand ling. this browning detracts from the appearance of fruits marketed fresh or used for processing. the extent of the discoloration depends not only on the severity of bruising, but also on the inherent browning potential of the fruits. Browning potential depends upon the total amount of phenolic compounds and level of activity of the ppo enzyme, which catalyzes enzymic browning in fresh fruits. Normally, phenolic compounds are separated from ppo enzyme in the intact tissue. Once the fruit tissue in damaged ppo gets access to the phenolic compounds, and reactions leading to browning occur. These reactions involve the oxidation of phenolic compounds to from quinones, which are tightly unstable and polymerize quickly to from brown-colored products.