Analysis of anisoles in wines using pervaporation coupled to gas chromatography-mass spectrometry.

Two procedures for the determination of 2,4,6-trichloroanisole, 2,6-dichloroanisole and 2,4,6-tribromoanisole in tainted wines have been developed. Both methods are based on pervaporation (PV) of the analytes and final determination by gas chromatography-ion-trap tandem mass spectrometry (GC-MS). In the Approach A, pervaporation was directly coupled to the GC-MS system (PV-GC-MS/MS) and in Approach B a solid-phase cryogenic trap-thermal desorption (CT-TD) device was connected to the pervaporator (PV-CT-TD-GC-MS/MS). Results show that last coupling present better sensitivity as well as precision. Detection limits (DLs) for 2,4,6-trichloroanisole were estimated to be 25.8 and 4.2 ng l(-1) for Approaches A and B, respectively, when 10 ml of sample was analysed. Linear range of the calibration curves ranged from quantification limit to 15 ng for PV-GC-MS/MS and from quantification limit to 2 ng for PV-CT-TD-GC-MS/MS. Due to the low threshold odour concentration of these compounds in wine, Approach B is proposed as a reliable method for analytical quality control of this product.