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A kinetic model for whey protein denaturation at different moisture contents and temperatures

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journal contribution
posted on 08.09.2017 by James C. Atuonwu, Joydeep Ray, Andy Stapley
The denaturation of whey protein samples that had previously undergone heat-treatment for different times at different temperatures and moisture contents was analysed by differential scanning calorimetry (DSC), using the DSC enthalpy as a measure of residual undenatured protein. Data were fitted to first order irreversible or reversible kinetic expressions, and the resulting rate constants were found to increase with both temperature and moisture content. The whole data set was then fitted as a function of time, temperature and moisture content, with rate constants varying according to either Arrhenius or Williams-Landel-Ferry (WLF) kinetics and with selected fit parameters made empirical functions of moisture content. The best fits were obtained using reversible WLF kinetics, which could be further slightly simplified without loss of accuracy. The model provides a platform for single- and multi-objective drying trajectory optimisation with respect to protein denaturation in dairy products.

Funding

The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ ERC grant agreement no. 613732 – ENTHALPY – www.enthalpy-fp7.eu

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

International Dairy Journal

Volume

75

Pages

41 - 50

Citation

ATUONWA, J.C., RAY, J. and STAPLEY, A.G.F., 2017. A kinetic model for whey protein denaturation at different moisture contents and temperatures. International Dairy Journal, 75, pp. 41-50.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

17/07/2017

Publication date

2017

Notes

This paper was published in the journal International Dairy Journal and the definitive published version is available at https://doi.org/10.1016/j.idairyj.2017.07.002.

ISSN

0958-6946

Language

en

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