Direct continuous supercritical fluid extraction as a novel method of wine analysis. Comparison with conventional indirect extraction and implications for wine variety identification |
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Authors: | Karásek Pavel Planeta Josef Varad'ová Ostrá Elena Mikesová Milena Goliás Jan Roth Michal Vejrosta Jirí |
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Institution: | Institute of Analytical Chemistry, Academy of Sciences of the Czech Republic, Veverí 97, 61142 Brno, Czech Republic. |
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Abstract: | Direct supercritical fluid extraction (SFE) of wines with carbon dioxide was compared to SFE of the sorbent used for solid-phase extraction of the same wine samples (SPE-SFE). Compared to SPE-SFE, the direct SFE results in amore specific and representative gas chromatographic fingerprint of the wine sample. The multivariate statistical processing of the direct SFE-GC data provides a clear-cut and sharp discrimination among the individual wine varieties while the discrimination based on the SPE-SFE-GC data is relatively poor. This finding reflects the adverse effects of additional analyte-sorbent interactions and sorption/desorption steps involved in SPE-SFE. |
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