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Thermal Inactivation Parameters of Peroxidase in Flammulina velutipes and Lyophyllum ulmarium  

Lee, Kyun (Division of Chemical Engineering & Biotechnology, Ajou University)
Kim, Kong-Hwan (Division of Chemical Engineering & Biotechnology, Ajou University)
Kim, Hyun-Ku (Korea Food Research Institute)
Publication Information
Korean Journal of Food Science and Technology / v.34, no.6, 2002 , pp. 1067-1072 More about this Journal
Abstract
Peroxidase was used as a standard enzyme to determine optimum blanching conditions of Flammulina velutipes and Lyophyllum ulmarium. Crude peroxidase extracted from raw mushrooms had maximum activity at $10{\sim}15^{\circ}C$ and pH 5.5 (50 mM, potassium phosphate buffer) using substrates of $H_2O_2$ and p-Phenylendiamine. Thermal inactivation of the crude peroxidase followed the first-order kinetics. The activation energy and z value of the crude peroxidase for F. velutipes were 59.58 kcal/mol and $9.0^{\circ}C$, whereas were 43.05 kcal/mol and $12.4^{\circ}C$ for L. ulmarium, respectively. On the basis of thermal kinetics parameters obtained, the optimum blanching conditions for F. velutipes and L. ulmarium were 1 min at $70^{\circ}C$ and 5 min at $80^{\circ}C$, respectively. Activation energies and z values of peroxidases extracted from heat-treated mushrooms were 7.97 and 6.55 kcal/mol, and $59.8^{\circ}C\;and\;74.1^{\circ}C$ for F. velutipes and L. ulmarium, respectively.
Keywords
blanching; peroxidase; Flammulina velutipes; Lyophyllum ulmarium;
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