title: Unexpected impact of 2-methylisoborneol as off-odour substance in aged wines.
abstract: Four Pinot noir wines from Burgundy were investigated by gas chromatography-olfactometry, with regard to the presence of earthy-smelling compounds. 2-Methylisoborneol (2-MIB) was detected in two of these wines, although the samples were seven years old, contradicting previous reports that this substance is unstable in wine and must. In order to investigate this seemingly paradoxical situation, 2-MIB stability was reinvestigated in wine and in model solution starting with an elevated initial concentration. Although 2-MIB concentration greatly decreased during the 90days of storage, the final concentration measured in both media was well above the odour threshold of the substance. Based on the observation of a decelerating decrease of 2-MIB with time, it was concluded that this substance can still be detected in wine and can induce, in this case, an earthy off-odour on condition that the start concentration is high enough.
authors.affiliation: Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestrasse 9, 91054 Erlangen, Germany. Electronic address: angela.lopez.pinar@fau.de.
authors.forename: Angela
authors.initials: A
authors.lastname: Lopez Pinar
authors.affiliation: Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestrasse 9, 91054 Erlangen, Germany. Electronic address: rahil.ghadiriasli@fau.de.
authors.forename: Rahil
authors.initials: R
authors.lastname: Ghadiriasli
authors.affiliation: Université de Bordeaux, EA 4577 Œnologie, USC 1366 INRA, Institut des Sciences de la Vigne et du Vin, 210 Chemin de Leysotte, CS 50008, 33882 Villenave d'Ornon cedex, France. Electronic address: philippe.darriet@u-bordeaux.fr.
authors.forename: Philippe
authors.initials: P
authors.lastname: Darriet
authors.affiliation: Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestrasse 9, 91054 Erlangen, Germany; Fraunhofer Institute for Process Engineering and Packaging IVV, Giggenhauser Strasse 35, 85354 Freising, Germany. Electronic address: andrea.buettner@ivv.fraunhofer.de.
authors.forename: Andrea
authors.initials: A
authors.lastname: Buettner
mesh_terms: D001892:Camphanes / Q000032:analysis*; D002849:Chromatography, Gas; D006801:Humans; D009812:Odorants / Q000032:analysis*; D064367:Olfactometry / Q000379:methods*; D012903:Smell; D014920:Wine / Q000032:analysis*
chemical_list: D001892:Camphanes; C005536:2-methylisoborneol
keywords: 2-Methyl-2-bornene; 2-Methylenebornane; Aroma; Gas chromatography-olfactometry (GC-O); Mouldy; Musty; Off-odours; Smell