Title: Comparative study of the inactivation kinetics of pectinmethylesterase in tomato juice and purified form
Authors: Fachin, D ×
Van Loey, AM
Nguyen, BL
Verlent, Isabel
Hendrickx, Marc #
Issue Date: 2002
Publisher: Amer chemical soc
Series Title: Biotechnology Progress vol:18 issue:4 pages:739-744
Abstract: Pectinmethylesterase (PME) extracted from tomato fruit was purified by affinity chromatography. A single peak of PME activity was observed, presenting a molar mass of 33.6 kDa, an isoelectric point higher than 9.3, and an optimal temperature and pH for activity of 55 degreesC and 8.0, respectively. The processing stability of purified tomato PME in buffer solution was compared to PME stability in tomato juice. In both media, thermal inactivation of PME presented first-order inactivation kinetics, PME in tomato juice being more heat-labile than purified PME. Regarding high-pressure treatment, tomato PME showed to be very pressure-resistant, revealing an outspoken antagonistic effect of,temperature and pressure. To avoid cloud loss in tomato juice, a time-temperature treatment of 1 min at 76.5 degreesC was calculated in order to have a residual PME activity of 1 x 10(-4) U/mL.
ISSN: 8756-7938
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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