title: The effects of pH and copper on the formation of volatile sulfur compounds in Chardonnay and Shiraz wines post-bottling.
abstract: The effects of pH and Cu(2+) treatment on the formation of volatile sulfur compounds (VSCs) were investigated in Chardonnay and Shiraz wine samples. Four VSCs were significantly affected by pH, with lower wine pH associated with decreased hydrogen sulfide (H2S), methanethiol, dimethyl sulfide, and carbon disulfide concentrations. The effects of pH and Cu(2+) on H2S formation from known precursor compounds were subsequently studied in a model wine system. In samples treated with cysteine and glutathione lower pH produced less H2S. Nanoparticle tracking analysis was used to study the effects of variable pH concentrations in a model system containing Cu(2+), tartaric acid, and H2S. Differences in Cu(2)(+)-tartrate complexes particle size and concentration were measured as a function of pH and H2S addition, suggesting the type of complexes formed may affect the binding sites of Cu(2+) available to catalyse the formation of VSCs such as H2S.
authors.affiliation: The Australian Wine Research Institute, P.O. Box 197, Glen Osmond, South Australia 5064, Australia. Electronic address: Marlize.Bekker@awri.com.au.
authors.forename: Marlize Z
authors.initials: MZ
authors.lastname: Bekker
authors.affiliation: The Australian Wine Research Institute, P.O. Box 197, Glen Osmond, South Australia 5064, Australia.
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Mierczynska-Vasilev
authors.affiliation: The Australian Wine Research Institute, P.O. Box 197, Glen Osmond, South Australia 5064, Australia.
authors.forename: Paul A
authors.initials: PA
authors.lastname: Smith
authors.affiliation: The Australian Wine Research Institute, P.O. Box 197, Glen Osmond, South Australia 5064, Australia.
authors.forename: Eric N
authors.initials: EN
authors.lastname: Wilkes
mesh_terms: D003300:Copper / Q000032:analysis / Q000737:chemistry*; D006862:Hydrogen Sulfide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013457:Sulfur Compounds / Q000737:chemistry*; D014920:Wine / Q000032:analysis*
chemical_list: D013438:Sulfhydryl Compounds; D013457:Sulfur Compounds; C005231:methylmercaptan; D003300:Copper; D006862:Hydrogen Sulfide
keywords: Copper; Dimethyl sulfide; Hydrogen sulfide; Methanethiol; Nanoparticle tracking analysis; Reductive aromas; Wine; Wine pH