Thermal pasteurization is known as the most common method in food processing. In this study, the effectiveness of come up time on inactivation of heat resistance isoform of polyphenol oxidase (PPO), as a pasteurization index, was investigated during heating of the quince puree in a water bath at 60 to 90 . M5 decision tree, a novel statistical method, was applied to understand the simple relationship between the treatment conditions (time and temperature) and changes in physicochemical

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... s of the puree. Browning index and the total color difference increased as a result of PPO inactivation and ascorbic acid degradation. Based on the results of the M5 decision tree models and sensitivity analysis it showed temperature was a more leading factor in the changes of the puree quality.