Screening of musty-earthy compounds from tainted cork using water-based soaks followed by headspace solid-phase microextraction and gas chromatography–mass spectrometry |
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Authors: | Chantal Prat Lluís Bañeras Enriqueta Anticó |
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Affiliation: | (1) Molecular Ecology Group, IEA, University of Girona, Facultat de Ciències, Campus Montilivi s/n, 17071 Girona, Spain;(2) Department of Chemistry, University of Girona, Facultat de Ciències, Campus Montilivi s/n, 17071 Girona, Spain |
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Abstract: | Compounds responsible for musty-earthy off-flavours in cork, namely 2-methylisoborneol (MIB), geosmin (GSM), 2,4,6-trichloroanisole
(TCA) and 2-methoxy-3-isopropylpyrazine (IPMP), were determined from tainted cork using water-based soaks followed by headspace
solid-phase microextraction and gas chromatography–mass spectrometry (HS-SPME–GC–MS). The influence of the fibre coating used
and of the extraction time and temperature were investigated for the joint analysis of MIB, GSM, TCA and IPMP. Considering
the obtained results, an extraction time of 30 min at a temperature of 50 °C were fixed as experimental conditions, using
a divinylbenzene/carboxen-polydimethylsiloxane/polydimethylsiloxane (DVB/CAR/PDMS) fibre. Quality parameters of the chromatographic
method were obtained and good recoveries (117–128%) were found in spiked aqueous cork macerates. Using the same experimental
conditions, the presence of guaiacol, 2,3,4,6-tetrachloroanisole (TeCA), pentachloroanisole (PCA), 2,4,6-tribromoanisole (TBA)
and 2-methoxy-3,5-dimethylpyrazine (MDMP) could also be evaluated in a single chromatogram. From all the compounds analyzed
in tainted samples, TCA and guaiacol were the only contaminants present and only TCA concentrations were found above its perception
threshold in water. |
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Keywords: | Cork Musty-earthy taint Solid phase microextraction |
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