Analysis of thermal inactivation kinetics of membrane-bound polyphenol oxidases and peroxidases from Metroxylon sagu

Thermal inactivation kinetics for the purified membrane-bound polyphenol oxidases (mPPOs) and peroxidases (mPODs) isolated from Metroxylon sagu were analyzed. Each isoenzyme was treated at different time-temperature combinations in the range of 0-70min and 20-70C. Thermal inactivation rates constant (k) at 70C for mPOD-I (72.9×10 -3/min) and mPOD-II (97.9×10 -3/min) were lower than that of mPPO-I (379.7×10 -3/min) and mPPO-II (138.1×10 -3/min). The activation energy for inactivation of mPPO-I (32.94kcal/mol) and mPPO-II (40.34kcal/mol) was lower compared with mPOD-I (45.77kcal/mol) and mPOD-II (40.62kcal/mol). The enthalpy values for mPOD-I (45.08kcal/mol) and mPOD-II (39.94kcal/mol) were higher than those of mPPOs (mPPO-I, 32.26kcal/mol; mPPO-II, 39.66kcal/mol). This result implies that both mPOD-I and mPOD-II are more thermostable.

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