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Article . 2023
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Estudio cinético y termodinámico del pardeamiento no enzimático de zumos clarificados de pera

Authors: Ibarz Martínez, Raquel; Garvín, Alfonso; Ibarz Ribas, Alberto;

Estudio cinético y termodinámico del pardeamiento no enzimático de zumos clarificados de pera

Abstract

In the present work, kinetic and thermodynamic compensation is applied to evaluate the kinetics of non-enzymatic browning of clarified pear juices. The kinetic constants were obtained in previous work for soluble solids contents of 47, 54, 63 and 70.5 °Brix and at temperatures of 50, 60, 70, 80 and 90 °C. For these kinetic constants, the equilibrium constants were determined using Eyring's equation for each soluble solids content and temperature. The kinetic constants were fitted to the Arrhenius equation. The pairs of estimates for lnK0 and the activation energy follow a linear trend, defining a kinetic compensation, with an isokinetic temperature of 145.6 °C. The equilibrium constants were fitted to the Van't Hoff equation. The set of pairs of estimates for the activation enthalpy and activation entropy followed a straight line, giving rise to thermodynamic compensation, with an isoequilibrium temperature of 142.8 °C. As expected, the isokinetic and isoequilibrium temperatures were very similar. It was concluded that the mechanism is the same for the ranges of soluble solids content and temperature studied. Since all the isokinetic and isoequilibrium temperatures were higher than the working temperature values, it was concluded that the control was enthalpic for all cases.

Country
Spain
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Keywords

Kinetic constants, Non-enzymatic browning, Kinetic compensation, Isoequilibrium temperature

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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