NDLI: Formation of Hydrogen Sulfide in Wine: Interactions between Copper and Sulfur Dioxide

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Formation of Hydrogen Sulfide in Wine: Interactions between Copper and Sulfur Dioxide

Content Provider	MDPI
Author	Bekker, Marlize Smith, Mark Smith, Paul Wilkes, Eric
Abstract	The combined synergistic effects of copper (Cu2+) and sulfur dioxide (SO2) on the formation of hydrogen sulfide (H2S) in Verdelho and Shiraz wine samples post-bottling was studied over a 12-month period. The combined treatment of Cu2+ and SO2 significantly increased H2S formation in Verdelho wines samples that were not previously treated with either Cu2+ or SO2. The formation of H2S produced through Cu2+ mediated reactions was likely either: (a) directly through the interaction of SO2 with either Cu2+ or H2S; or (b) indirectly through the interaction of SO2 with other wine matrix compounds. To gain better understanding of the mechanisms responsible for the significant increases in H2S concentration in the Verdelho samples, the interaction between Cu2+ and SO2 was studied in a model wine matrix with and without the presence of a representative thiol quenching compound (4-methylbenzoquinone, 4MBQ). In these model studies, the importance of naturally occurring wine compounds and wine additives, such as quinones, SO2, and metal ions, in modulating the formation of H2S post-bottling was demonstrated. When present in equimolar concentrations a 1:1 ratio of H2S- and SO2-catechol adducts were produced. At wine relevant concentrations, however, only SO2-adducts were produced, reinforcing that the competition reactions of sulfur nucleophiles, such as H2S and SO2, with wine matrix compounds play a critical role in modulating final H2S concentrations in wines.
File Size	1253376
File Format	PDF
e-ISSN	14203049
DOI	10.3390/molecules21091214
Journal	Molecules
Issue Number	9
Volume Number	21
Language	English
Publisher Date	2016-09-10
Access Restriction	Open
Subject Keyword	reductive aromas hydrogen sulfide quinone wine copper sulfur dioxide
Content Type	Text
Resource Type	Article

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