Simultaneous separation, clean-up and analysis of musty odorous compounds in wines by on-line coupling of a pervaporation unit to gas chromatography–tandem mass spectrometry

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• 作者：Gó ; mez-Ariza ; J.L. ; Garcí ; a-Barrera ; T. ; Lorenzo ; F.
• 关键词：Anisoles ; Wine ; Pervaporation ; GC&ndash ; MS ; Taint ; Off-flavour ; Musty compounds ; Carbofrit
• 刊名：Analytica Chimica Acta
• 出版年：2004
• 期刊代码：2_00032670
• 类别：ch
• 出版时间：July 19, 2004
• 卷：516
• 期：1-2
• 页码：165-170
• 文件大小：221 K

摘要

A procedure for fast, reliable and precise analysis of 2,4,6-trichloroanisole (TCA) and other anisoles [2,6-dichloroanisole (DCA) and 2,4,6-tribomoanisole (TBA)] in cork-tainted wines has been performed. The method is based on compounds separation by pervaporation (PV) and later on-line clean-up, using a Carbofrit packed liner (CPL) fitted to the gas chromatograph–mass spectrometer injector (PV–CPL–GC–MS). Detection limit was about 54pg for TCA (5ngl⁻¹ when aliquots of 10ml were used in the analysis). These results were comparable with those obtained from the coupling pervaporation solid-phase cryogenic trap–thermal desorption GC–MS (PV–CT–TD–GC–MS) and solid-phase microextraction gas chromatography. Precision of PV–CPL–GC–MS, expressed as relative standard deviation, was 5.2, 2.0 and 6.2%for DCA, TCA and TBA, respectively. Linear range of calibration curves ranged from quantification limit to 2ng for all the anisoles. In addition, the method based on the PV–CPL–GC–MS coupling was more rapid and reliable than that using PV–CT–TD–GC–MS, due to the one-step direct on-line introduction of analytes from the PV unit to the GC–MS system facilitated by CPL, which increases the analysis precision and sample throughput.