The colorimetric measurement of free and bound Cu in white wine

Andrew Clark, Nickos Kodoudakis

Research output: Book chapter/Published conference paperConference paper

Abstract

Copper (Cu) is often added to wine to treat or prevent the accumulation of hydrogen sulfide and its assocaited odour. However, Cu in wine can affect oxidative and reductive ageing mechanisms and the rate at which they occcur. Recently it has been shown that the Cu in wine exists predominantly in tow forms whereby it is either bound to sulfide (bound) or not bound to sulfide (free). the measurement of free Cu can potentially provide a means of better understanding the activity of Cu in wine and how it affects reductive and oxidative aspects of wine. However, the current measures of Cu forms are labour-intensive and require expensive equipment not generally found in wineries. This paper describes the development of a routine colorimetric method to allow the determination of free Cu in white wine, which, combined with total Cu concentrations, also allows calculation of the bound Cu concentration. Further work is till required to understand exactly how and if the free Cu concentration of wine at bottling can be optimised to avoid the accumulation of 'reductive' aromas in wine.
Original languageEnglish
Title of host publicationConference Proceedings: 17th Australian Wine Industry Technical Conference
EditorsKate Beames, Ella Robinson, Peter Dry, Dan Johnson
PublisherAustralian Wine Industry Technical Conference Inc.
Pages100-103
Number of pages4
Publication statusPublished - Jul 2019
Event17th Australian Wine Industry Technical Conference (AWITC 2019) - Adelaide Convention Centre, Adelaide, Australia
Duration: 21 Jul 201924 Jul 2019
https://awitc.com.au
https://awitc.com.au/conference-program/ (Program)
https://awitc.com.au/program/proceedings/seventeenth/ (Conference report)

Conference

Conference17th Australian Wine Industry Technical Conference (AWITC 2019)
Country/TerritoryAustralia
CityAdelaide
Period21/07/1924/07/19
OtherThe Australian Wine Industry Technical Conference is the premier technical event for the Australian wine industry. Held every three years since 1970, it combines an extensive program of plenary sessions, workshops, posters, student forum and social events with the industry’s most respected and extensive trade exhibition.

The Australian Wine Industry Technical Conference Inc. has two members: The Australian Wine Research Institute and the Australian Society of Viticulture and Oenology.
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