2016
DOI: 10.1021/acs.jafc.6b00642
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Reaction Mechanisms of Metals with Hydrogen Sulfide and Thiols in Model Wine. Part 2: Iron- and Copper-Catalyzed Oxidation

Abstract: Sulfidic off-odors arising during wine production are frequently removed by Cu(II) fining. In part 1 of this study ( 10.1021/acs.jafc.6b00641 ), the reaction of H2S and thiols with Cu(II) was examined; however, the interaction of iron and copper is also known to play an important synergistic role in mediating non-enzymatic wine oxidation. The interaction of these two metals in the oxidation of H2S and thiols (cysteine, 3-sulfanylhexan-1-ol, and 6-sulfanylhexan-1-ol) was therefore examined under wine-like condi… Show more

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Cited by 46 publications
(52 citation statements)
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“…A proposed mechanistic pathway, which is in line with the reported literature, is outlined in Scheme . It is believed that metal oxide nanoparticles convert 1 mmol of H 2 O 2 to 2 mmol of hydroxyl radicals .…”
Section: Resultsmentioning
confidence: 99%
“…A proposed mechanistic pathway, which is in line with the reported literature, is outlined in Scheme . It is believed that metal oxide nanoparticles convert 1 mmol of H 2 O 2 to 2 mmol of hydroxyl radicals .…”
Section: Resultsmentioning
confidence: 99%
“…These species can further coordinate, release disulfides and form large clusters some of which could remain in solution. Upon oxidation in the presence of iron, most H 2 S and mercaptans would end as polysulfides and other complex species (Kreitman, Danilewicz, Jeffery, & Elias, 2016b). Nevertheless, some of the complexes formed between Cu(II) and other metal cations with H 2 S and MeSH have been found to be reversible (Chen, Jastrzembski, & Sacks, 2017;Franco-Luesma & Ferreira, 2014), so that a simple dilution of wine in brine makes it possible to recover the volatile species.…”
Section: Introductionmentioning
confidence: 99%
“…This complicated scenario has just recently begun to be understood when new chemical assays have made it possible to recognize the existence of different species of these molecules interconnected via different chemical equilibria [19][20][21][22][23] . Additional recent works revealing key details about the interactions between sulfides, copper, iron and oxygen 18,[22][23][24] have provided an essential theoretical framework to understand the relationship between the different species.…”
Section: Introductionmentioning
confidence: 99%