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Research Article

Copper-Complexed Hydrogen Sulfide in Wine: Measurement by Gas Detection Tubes and Comparison of Release Approaches

Yi Chen, Jillian A. Jastrzembski, Gavin L. Sacks
Am J Enol Vitic. January 2017 68: 91-99; published ahead of print August 17, 2016 ; DOI: 10.5344/ajev.2016.16024
Yi Chen
1State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China
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Jillian A. Jastrzembski
2Department of Food Science, Cornell University, 411 Tower Road, Ithaca, NY, 14853
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Gavin L. Sacks
2Department of Food Science, Cornell University, 411 Tower Road, Ithaca, NY, 14853
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  • For correspondence: gls9@cornell.edu
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This article has a correction. Please see:

  • Erratum - January 01, 2018

Abstract

Recent work suggests that copper complexes may serve as a latent source of free hydrogen sulfide (H2S) and other malodorous volatile thiols during wine storage. However, measurements of these complexes require analytical tools that are unavailable to most wineries. To facilitate additional studies of these compounds, we developed an inexpensive and convenient method for detecting copper-complexed H2S in wine with commercially available colorimetric gas detection tubes. Using brine dilution as a pretreatment, we observed that this approach showed acceptable detection limits (0.34 μg/L) and excellent H2S recovery from both model and real wines. Alternative approaches to H2S release from copper sulfide complexes were also investigated, including ethylenediaminetetraacetic acid (EDTA), neocuproine, ascorbic acid, and tris(2-carboxyethyl)phosphine (TCEP), alone and in combination. EDTA resulted in loss of free H2S. Partial recovery (35 to 70%) of H2S from model wines was achieved with the other reagents, with the release induced by ascorbic acid being of particular interest to winemakers. In a survey of seven commercial wines, the fraction of complexed H2S released by the brine was 80 to 95% of the total H2S pool, with lower releases observed for neocuproine and ascorbic acid. However, in several wines, TCEP treatment released higher concentrations of H2S from unknown precursors.

  • copper complexes
  • hydrogen sulfide
  • reduced wine
  • sulfur-like off-aroma
  • wine analysis
  • ©2017 by the American Society for Enology and Viticulture
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Copper-Complexed Hydrogen Sulfide in Wine: Measurement by Gas Detection Tubes and Comparison of Release Approaches
Yi Chen, Jillian A. Jastrzembski, Gavin L. Sacks
Am J Enol Vitic.  January 2017  68: 91-99;  published ahead of print August 17, 2016 ; DOI: 10.5344/ajev.2016.16024

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Copper-Complexed Hydrogen Sulfide in Wine: Measurement by Gas Detection Tubes and Comparison of Release Approaches
Yi Chen, Jillian A. Jastrzembski, Gavin L. Sacks
Am J Enol Vitic.  January 2017  68: 91-99;  published ahead of print August 17, 2016 ; DOI: 10.5344/ajev.2016.16024
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