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A KINETIC MODEL FOR ACCELERATED TESTS of MAILLARD BROWNING IN A LIQUID MODEL SYSTEM
Author(s) -
WEISSMAN I.,
RAMON O.,
KOPELMAN I.J.,
MIZRAHI S.
Publication year - 1993
Publication title -
journal of food processing and preservation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.511
H-Index - 48
eISSN - 1745-4549
pISSN - 0145-8892
DOI - 10.1111/j.1745-4549.1993.tb00235.x
Subject(s) - maillard reaction , browning , chemistry , kinetic energy , kinetics , copper , thermodynamics , ion , glycine , model system , organic chemistry , biochemistry , computational chemistry , amino acid , quantum mechanics , physics
The feasibility of a novel approach to accelerated storage tests was evaluated for Maillard browning of a glucose‐glycine model system. This approach is based on use, in addition to external conditions such as temperature, of composition to accelerate the rate of deterioration. Reactant concentration, and catalysts are not affected by storage conditions but still can be used to obtain a high rate of deterioration. They can be, therefore, an important part of accelerated tests procedures provided that one establishes first the comprehensive kinetic model that includes the effect of all the factors that are used. For a glucose‐glycine model system, a comprehensive kinetic model was evaluated for a wide range of conditions (reactants concentration 0.0625‐2 M, copper ions up to 50 ppm, pH 4–8 and temperatures 30–61C) and found to have an apparent order of reaction of 0.8 (representing the combined effect of a first order induction period and the following zero order phase). All the factors that were used are capable of affecting the rate of reaction. the kinetic model was found to be a simple four parameter equation where the effect of the pH is manifested mainly through the level of the unprotonated form of the amino acid. However copper ions have a relatively small effect and thus could be eliminated from the model. Without the copper, the kinetic model is a very simple three parameter equation that can be easily evaluated by accelerated tests and used to extrapolate the data to normal storage conditions.