The level of PPO activity was very low (<0.1 U g−1) in pineapple flesh. PPO activity in all treatments increased gradually with prolonged storage time and the increase in PPO activity of fruit stored at 25 ◦C was more rapid, while low temperature treatments significantly inhibited this trend. There were significant differences in PPO activities following samples of storage at 6 and 10 ◦C from day 6 (Fig. 1A)
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