Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 50, Issue 14, Pages 4119-4125Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf011698i
Keywords
thermal inactivation; kinetic parameters; peroxidase; pectin methylesterase; polygalacturonase; carrots; potatoes
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Kinetic parameters for the thermal inactivation of several enzymes in carrot and potato homogenates have been determined. In carrots the most heat-resistant activity was polygalacturonase, followed by peroxidase and pectinmethylesterase. In potatoes peroxidase was the most resistant, followed by pectin methylesterase, polyphenol oxidase, and lipoxygenase. There were several notable similarities between the inactivation kinetics in the two vegetables. In both cases peroxidase activity gave simple first-order inactivation kinetics but yielded a curved Arrhenius plot for the temperature dependence. Pectin methylesterase in both commodities consisted of a labile and a resistant form. The relative amounts of the two forms and the temperature dependences for their inactivation were also similar.
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