Document Detail


Isothermal and non-isothermal kinetic models of chemical processes in foods governed by competing mechanisms.
MedLine Citation:
PMID:  19637869     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A process or reaction that peaks at high temperatures but not at low ones indicates competition between synthesis and degradation. A proposed phenomenological model composed of a decay factor superimposed on a growth term can describe both. Temperature elevation shortens the two subprocesses' characteristic times and increases their rates. The degradation's characteristic time relative to the experiment's determines whether a peak is observed. All of the parameters determine the peak's height and shape as can be seen in two interactive Wolfram demonstrations on the Web. Detailed knowledge of the underlying mechanisms is unnecessary for the model's construction, and uniqueness is not a prerequisite either. However, different expressions might be needed for ongoing processes and ones initially undetectable. The model's applicability is demonstrated with published results on very different reactions in foods. In principle, it can be converted into a dynamic rate equation for simulating a process's evolution under non-isothermal conditions.
Authors:
Micha Peleg; Maria G Corradini; Mark D Normand
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  57     ISSN:  1520-5118     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2009 Aug 
Date Detail:
Created Date:  2010-03-30     Completed Date:  2010-07-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7377-86     Citation Subset:  IM    
Affiliation:
Department of Food Science, University of Massachusetts, Amherst, Massachusetts 01003, USA. micha.peleg@foodsci.umass.edu
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MeSH Terms
Descriptor/Qualifier:
Chemical Processes*
Food Analysis*
Hot Temperature
Kinetics
Models, Theoretical
Thermodynamics

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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