title: Development of a rapid method for the quantitative analysis of four methoxypyrazines in white and red wine using multi-dimensional Gas Chromatography-Mass Spectrometry.
abstract: Alkyl-methoxypyrazines (MPs) are important odour-active constituents of many grape cultivars and their wines. Recently, a new MP - 2,5-dimethyl-3-methoxypyrazine (DMMP) - has been reported as a possible constituent of wine. This study sought to develop a rapid and reliable method for quantifying DMMP, isopropyl methoxypyrazine (IPMP), secbutyl methoxypyrazine (SBMP) and isobutyl methoxypyrazine (IBMP) in wine. The proposed method is able to rapidly and accurately resolve all 4 MPs in a range of wine styles, with limits of detection between 1 and 2 ng L(-1) for IPMP, SBMP and IBMP and 5 ng L(-1) for DMMP. Analysis of a set of 11 commercial wines agrees with previously published values for IPMP, SBMP and IBMP, and shows for the first time that DMMP may be an important and somewhat common odorant in red wines. To our knowledge, this is the first analytical method developed for the quantification of DMMP in wine.
authors.affiliation: Department of Biological Sciences, Brock University, St. Catharines, Ontario L2S 3A1, Canada.
authors.forename: Andreea
authors.initials: A
authors.lastname: Botezatu
authors.affiliation: Department of Biological Sciences, Brock University, St. Catharines, Ontario L2S 3A1, Canada; Cool Climate Oenology and Viticulture Institute, Brock University, St. Catharines, Ontario L2S 3A1, Canada; Department of Psychology, Brock University, St. Catharines, Ontario L2S 3A1, Canada; Environmental Sustainability Research Centre, Brock University, St. Catharines, Ontario L2S 3A1, Canada. Electronic address: gpickering@brocku.ca.
authors.forename: Gary J
authors.initials: GJ
authors.lastname: Pickering
authors.affiliation: Department of Food Science & Technology, Agricultural University of Athens, 11855 Athens, Greece.
authors.forename: Yorgos
authors.initials: Y
authors.lastname: Kotseridis
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D009812:Odorants / Q000032:analysis; D011719:Pyrazines / Q000032:analysis*; D014920:Wine / Q000032:analysis*
chemical_list: C000602527:2,5-dimethyl-3-methoxypyrazine; D011719:Pyrazines
keywords: Dimethyl methoxypyrazin; Methoxypyrazines; Multi dimensional gas chromatography; Wine