Impact of light on protective fractions of Cu in white wine: Influence of oxygen and bottle colour.

Autor: Vongluanngam I; School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia; Gulbali Institute, Charles Sturt University, Wagga Wagga, NSW 2678, Australia; The Australian Research Council Training Centre for Innovative Wine Production, University of Adelaide (Waite Campus), 5064, Australia. Electronic address: ivongluanngam@csu.edu.au., Zhang X; School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia; Gulbali Institute, Charles Sturt University, Wagga Wagga, NSW 2678, Australia. Electronic address: xizhang@csu.edu.au., Blackman JW; School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia; Gulbali Institute, Charles Sturt University, Wagga Wagga, NSW 2678, Australia. Electronic address: jblackman@csu.edu.au., Schmidtke LM; School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia; Gulbali Institute, Charles Sturt University, Wagga Wagga, NSW 2678, Australia; The Australian Research Council Training Centre for Innovative Wine Production, University of Adelaide (Waite Campus), 5064, Australia. Electronic address: lschmidtke@csu.edu.au., Wilkinson KL; The Australian Research Council Training Centre for Innovative Wine Production, University of Adelaide (Waite Campus), 5064, Australia; Department of Wine Science and Waite Research Institute, The University of Adelaide, PMB 1, Glen Osmond, SA 5064, Australia. Electronic address: Kerry.wilkinson@adelaide.edu.au., Clark AC; School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia; Gulbali Institute, Charles Sturt University, Wagga Wagga, NSW 2678, Australia; The Australian Research Council Training Centre for Innovative Wine Production, University of Adelaide (Waite Campus), 5064, Australia. Electronic address: aclark@csu.edu.au.
Jazyk: angličtina
Zdroj: Food chemistry [Food Chem] 2024 Sep 15; Vol. 452, pp. 139504. Date of Electronic Publication: 2024 Apr 27.
DOI: 10.1016/j.foodchem.2024.139504
Abstrakt: Cu(II)-organic acid (fraction I) and Cu(I)-thiol (fraction II) complexes can suppress sulfhydryl off-aromas in wine. This study investigated the impact of light exposure on the protective fractions of Cu of bottled white wine. Fluorescent light-exposed Chardonnay with two initial concentrations of dissolved oxygen (0.5 and 10 mg/L) was stored in different coloured bottles and concentrations of Cu fractions and riboflavin, a photo-initiator at 370-440 nm, were measured during 110 days storage. Light-exposed wines with lower oxygen concentrations resulted in a 100-fold decrease in the Cu fraction I half-life, and a 60-fold decrease for Cu fractions I and II combined. The half-life for Cu fraction I decay during light exposure was extended 30-fold with the use of brown compared to flint glass. Light exposure can rapidly exhaust the protective Cu fractions in wine, and bottles with less light transmission below 440 nm can slow this loss.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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