Similarly, Chaisakdanugull et al.(2007) reported that pineapple juice effectively inhibited enzymatic browning in banana fruit which was related to the inhibitory action of organic acids (citric and malic acids) in pineapple juice on PPO. Lozano-de-Gonzalez et al. (1993) and Wen (2001) suggested that proteases in pineapple juice mainly contributed to this inhibition.