Abstract
Cork quality is crucial for the fabrication of corks intended to be used to seal wine bottles. This work has focused on the determination of chloroanisoles (CAs)—exogenous compounds with a low perception threshold—in cork. The identification and quantification of these compounds was carried out with Bond Elut-ENV solid phase extraction and gas chromatography with mass spectrometry detection. Cork samples were obtained from oaks from Catalonia, Extremadura and Italy, and the presence of CAs was evaluated. Moreover, cork affected by the presence of yellow stains (a defect present in cork, mainly originated from the growth of the fungus Armillaria mellea) was analysed separately. The results obtained from cork macerates revealed the presence of trichloroanisole (TCA) in Catalan and Italian cork. Furthermore, TCA concentration was not statistically different when comparing cork affected and non-affected by the growth of A. mellea. Other chlorinated compounds were identified by comparison of their mass spectra with the data from the NIST library.
Highlights
Cork is a natural material obtained from the outer bark of Quercus suber
Co × Vo where Co represents the spiked concentration of the hydroalcoholic solution or the cork macerate, and Cf is the concentration obtained from the peak area and using the calibration curves shown previously (Section 2.1)
Gas chromatography analysis was performed with a Trace gas chromatography (GC) Ultra equipped with a Polaris Q ion trap mass spectrometer (Thermo Scientific, Waltham, MA, USA) operating in the electron ionization mode at 70 eV
Summary
Cork is a natural material obtained from the outer bark of Quercus suber. It is mainly used for the fabrication of cork stoppers employed in the wine industry for bottling. [3,9].inOn the contrary, if the total concentration is sought, an exhaustive solid–liquid extraction of cork is necessary, using white wine, or water is is used for the determination ofsolid–liquid the releasable fraction.ofOnce chlorinated total concentration sought, an exhaustive extraction corkthe is necessary, using apolar solvents like hexane. These methods were recently revised by Tarasov et al [10].
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