Determination of 2,4,6-trichloroanisole and guaiacol in cork stoppers by pressurised fluid extraction and gas chromatography-mass spectrometry.
This paper describes the development of an analytical method consisting of pressurised fluid extraction (PFE) and gas chromatography-mass spectrometry (GC-MS) using experimental designs to determine two volatile compounds in naturally-tainted cork stoppers. The target analytes, 2,4,6-trichloroanisole (2,4,6-TCA) and guaiacol, are involved in the cork taint of wine. First, a Plackett-Burman experimental design was carried out in order to determine the significant experimental parameters affecting the PFE process, and then a central composite design was used to optimise these significant parameters. Once the method had been optimised, the influence of the number of extraction cycles was studied. The method was applied to determine the concentration of 2,4,6-TCA and guaiacol in three cork samples, and the results were compared with the ones obtained by multiple headspace-solid-phase microextraction (MHS-SPME) and by Soxhlet extraction.
Ezquerro
Oscar
O
Chemistry Department, University of La Rioja, C/Madre de Dios 51, E-26006, Logroño La Rioja, Spain.
Garrido-López
Alvaro
A
Tena
María Teresa
MT
D000840:Anisoles / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006139:Guaiacol / Q000032:analysis*; D032102:Phellodendron / Q000737:chemistry*
D000840:Anisoles; C110228:2,4,6-trichloroanisole; D006139:Guaiacol