Title: Thermal and high-pressure inactivation kinetics of polyphenol oxidase in victoria grape must
Authors: Rapeanu, G ×
Van Loey, Ann
Smout, Chantal
Hendrickx, Marc #
Issue Date: Jan-2005
Publisher: Amer chemical soc
Series Title: Journal of Agricultural and Food Chemistry vol:53 issue:8 pages:2988-2994
Abstract: The inactivation kinetics of polyphenol oxidase (PPO) in freshly prepared grape must under high hydrostatic pressure (100-800 MPa) combined with moderate temperature (20-70 degrees C) was investigated. Atmospheric pressure conditions in a temperature range of 55-70 degrees C were also tested. Isothermal inactivation of PPO in grape must could be described by a biphasic model. The values of activation energy and activation volume of stable fraction were estimated as 53.34 kJ mol(-1) and -18.15 cm(3) mol(-1) at a reference pressure of 600 MPa and reference temperature of 50 degrees C, respectively. Pressure and temperature were found to act synergistically, except in the high-temperature-low-pressure region where an antagonistic effect was found. A third-degree polynomial model was successfully applied to describe the temperature/pressure dependence of the inactivation rate constants of the stable PPO fraction in grape must.
ISSN: 0021-8561
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Food and Microbial Technology
× corresponding author
# (joint) last author

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