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Fast quantification of whisky lactone in oak wood by ion mobility spectrometer
Bartosz Michalczuk1, Martin Sabo2, Katarína Jatzová2
1Department of Experimental Physics, Comenius University, Mlynská dolina F2, 84248, Bratislava, Slovak Republic; Siedlce University of Natural Sciences and Humanities, Faculty of Exact and Natural Sciences, Siedlce, Poland.
Abstract:
An Ion Mobility Spectrometry (IMS) apparatus has been used to detect the β-methyl-γ-octalactone (Whisky Lactone - WL) standard in the air and as well WL vapours originating from the oak wood samples. The IMS was equipped with Atmospheric Pressure Chemical Ionisation (APCI) ion source based on a Corona Discharge (CD) and was operated in the positive polarity. The IMS spectrum of WL exhibits two peaks, a monomer with reduced ion mobility value K0 = 1.39 cm2V-1s-1 and dimer K0 = 1.09 cm2V-1s-1. Using Ion Mobility orthogonal acceleration Time of Flight mass spectrometer (IMS-oaTOF MS) these peaks were identified as protonated monomer M.H+.(H2O)0,1 and dimer M2.H+ ions respectively. The limit of detection study resulted in LOD for WL of 50 ppbv. Detection of WL from oak wood samples of different "Quality Level" (QL) categories (categories 1 to 10), indicated strong correlation between the QL category number and the response of the IMS.
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