title: Study and modeling of the evolution of gas-liquid partitioning of hydrogen sulfide in model solutions simulating winemaking fermentations.
abstract: The knowledge of gas-liquid partitioning of aroma compounds during winemaking fermentation could allow optimization of fermentation management, maximizing concentrations of positive markers of aroma and minimizing formation of molecules, such as hydrogen sulfide (H2S), responsible for defects. In this study, the effect of the main fermentation parameters on the gas-liquid partition coefficients (Ki) of H2S was assessed. The Ki for this highly volatile sulfur compound was measured in water by an original semistatic method developed in this work for the determination of gas-liquid partitioning. This novel method was validated and then used to determine the Ki of H2S in synthetic media simulating must, fermenting musts at various steps of the fermentation process, and wine. Ki values were found to be mainly dependent on the temperature but also varied with the composition of the medium, especially with the glucose concentration. Finally, a model was developed to quantify the gas-liquid partitioning of H2S in synthetic media simulating must to wine. This model allowed a very accurate prediction of the partition coefficient of H2S: the difference between observed and predicted values never exceeded 4%.
authors.affiliation: †INRA, UMR 1083, 2 Place Viala, 34060 Montpellier Cedex 1, France.|‡Montpellier SupAgro, UMR 1083, 2 Place Viala, 34060 Montpellier Cedex 1, France.|§Université Montpellier, UMR 1083, 2 Place Viala, 34060 Montpellier Cedex 1, France.
authors.forename: Jean-Roch
authors.initials: JR
authors.lastname: Mouret
authors.affiliation: †INRA, UMR 1083, 2 Place Viala, 34060 Montpellier Cedex 1, France.|‡Montpellier SupAgro, UMR 1083, 2 Place Viala, 34060 Montpellier Cedex 1, France.|§Université Montpellier, UMR 1083, 2 Place Viala, 34060 Montpellier Cedex 1, France.
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Sablayrolles
authors.affiliation: †INRA, UMR 1083, 2 Place Viala, 34060 Montpellier Cedex 1, France.|‡Montpellier SupAgro, UMR 1083, 2 Place Viala, 34060 Montpellier Cedex 1, France.|§Université Montpellier, UMR 1083, 2 Place Viala, 34060 Montpellier Cedex 1, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Farines
mesh_terms: D005285:Fermentation; D006862:Hydrogen Sulfide / Q000737:chemistry*; D007700:Kinetics; D008962:Models, Theoretical; D013455:Sulfur / Q000737:chemistry; D014920:Wine / Q000032:analysis
chemical_list: D013455:Sulfur; D006862:Hydrogen Sulfide
keywords: gas−liquid transfer; hydrogen sulfide; modeling; partition coefficient; volatility; wine fermentation