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dc.contributor.authorSchurek, J.
dc.contributor.authorPortolés Nicolau, Tania
dc.contributor.authorHajslova, J.
dc.contributor.authorRiddellova, K.
dc.contributor.authorHernández Hernández, Félix
dc.identifier.citationAnalytica Chimica Acta, 611, 2, p. 163-172
dc.description.abstractA new method has been developed to detect 36 pesticides that may contaminate tea samples (green, black and fruit tea). The hyphenation of solid-phase microextraction in head-space mode with a comprehensive two-dimensional gas chromatography coupled with high-speed time-of-flight mass spectrometry (HS-SPME-GC × GC/TOF MS) proved to be a quick alternative to conventional GC/MS methodology which employs solvent-based extraction. The key parameters for controlling HS-SPME performance were optimized, including fiber coating type, temperature and absorption time settings and tea matrix modification by adding water. Quantification was carried out using matrix-matched calibration. The repeatability of measurements, expressed as relative standard deviation (R.S.D.), was less than 24% for all analytes. The limits of quantification ranged from 1 to 28 μg kg<sup>-1</sup>. The optimized method was applied to analyze real life samples obtained from a retail market. Results generated by the new SPME procedure and those obtained by using a conventional one involving ethyl acetate extraction and high-performance gel permeation chromatography (HPGPC) clean up agreed with each other for positive (containing residue) samples. © 2008 Elsevier B.V. All rights reserved.
dc.subjectComprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry
dc.subjectSolid-phase microextraction
dc.titleApplication of head-space solid-phase microextraction coupled to comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry for the determination of multiple pesticide residues in tea samples

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