Astringency reduction in red wine by whey proteins

Jauregi, P., Olatujoye, J. B., Cabezudo, I., Frazier, R. A. ORCID: https://orcid.org/0000-0003-4313-0019 and Gordon, M. H. (2016) Astringency reduction in red wine by whey proteins. Food Chemistry, 199. pp. 547-555. ISSN 0308-8146 doi: 10.1016/j.foodchem.2015.12.052

Abstract/Summary

Whey is a by-product of cheese manufacturing and therefore investigating new applications of whey proteins will contribute towards the valorisation of whey and hence waste reduction. This study shows for the first time a detailed comparison of the effectiveness of gelatin and β-lactoglobulin (β-LG) as fining agents. Gelatin was more reactive than whey proteins to tannic acid as shown by both the astringency method (with ovalbumin as a precipitant) and the tannins determination method (with methylcellulose as a precipitant). The two proteins showed similar selectivity for polyphenols but β-LG did not remove as much catechin. The fining agent was removed completely or to a trace level after centrifugation followed by filtration which minimises its potential allergenicity. In addition, improved understanding of protein–tannin interactions was obtained by fluorescence, size measurement and isothermal titration calorimetry (ITC). Overall this study demonstrates that whey proteins have the potential of reducing astringency in red wine and can find a place in enology.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/56221
Identification Number/DOI	10.1016/j.foodchem.2015.12.052
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Research Group
Publisher	Elsevier
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