| Thermal and high-pressure inactivation kinetics of polyphenol oxidase in Victoria grape must. | |
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MedLine Citation:
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PMID: 15826049 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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 cm3 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. |
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Authors:
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Gabriela Rapeanu; Ann Van Loey; Chantal Smout; Marc Hendrickx |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of agricultural and food chemistry Volume: 53 ISSN: 0021-8561 ISO Abbreviation: J. Agric. Food Chem. Publication Date: 2005 Apr |
Date Detail:
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Created Date: 2005-04-13 Completed Date: 2005-05-26 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0374755 Medline TA: J Agric Food Chem Country: United States |
Other Details:
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Languages: eng Pagination: 2988-94 Citation Subset: IM |
Affiliation:
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Faculty of Food Science and Engineering, Department of Bioengineering, University "Dunaren de Jos" Galati, Domneasca 111, 800201 Galati, Romania. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Catechol Oxidase
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chemistry,
metabolism* Enzyme Activation Fruit / enzymology* Hot Temperature* Hydrostatic Pressure* Kinetics Thermodynamics Vitis / enzymology* |
| Chemical | |
Reg. No./Substance:
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EC 1.10.3.1/Catechol Oxidase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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