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1.
Molecules ; 27(15)2022 Jul 30.
Artigo em Inglês | MEDLINE | ID: mdl-35956842

RESUMO

Vineyard exposure to wildfire smoke can taint grapes and wine. To understand the impact of this taint, it is imperative that the analytical methods used are accurate and precise. This study compared the variance across nine commercial and research laboratories following quantitative analysis of the same set of smoke-tainted wines. In parallel, correlations between the interlaboratory consensus values for smoke-taint markers and sensory analyses of the same smoke-tainted wines were evaluated. For free guaiacol, the mean accuracy was 94 ± 11% in model wine, while the free cresols and 4-methylguaiacol showed a negative bias and/or decreased precision relative to guaiacol. Similar trends were observed in smoke-tainted wines, with the cresols and glycosidically bound markers demonstrating high variance. Collectively, the interlaboratory results show that data from a single laboratory can be used quantitatively to understand smoke-taint. Results from different laboratories, however, should not be directly compared due to the high variance between study participants. Correlations between consensus compositional data and sensory evaluations suggest the risk of perceivable smoke-taint can be predicted from free cresol concentrations, overcoming limitations associated with the occurrence of some volatile phenols, guaiacol in particular, as natural constituents of some grape cultivars and of the oak used for barrel maturation.


Assuntos
Vitis , Compostos Orgânicos Voláteis , Vinho , Consenso , Cresóis/metabolismo , Guaiacol/análise , Humanos , Fenóis/análise , Fumaça/análise , Vitis/metabolismo , Compostos Orgânicos Voláteis/análise , Vinho/análise
2.
Anal Bioanal Chem ; 375(7): 948-55, 2003 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-12707766

RESUMO

Stir bar sorptive extraction (SBSE) coupled with gas chromatography/mass spectrometry (GC/MS) was used to analyse wine samples for three applications: flavour and compositional analysis; 2,4,6-trichloroanisole (TCA), a common off-aroma in wine; and agrochemicals. SBSE was found to be orders of magnitude more sensitive than modern conventional methodology, allowing for lower detection and quantitation levels, and improved confirmation of identity; SBSE often gave better signal to noise in scan mode than other methods in selective ion monitoring (SIM) mode. With the help of their characteristic mass spectra all agrochemicals could be identified unambiguously at concentrations of 10 microg L(-1) in wine and a further 100 constituents were detected in a Cabernet Sauvignon sample. Thus it is now possible to analyse complex samples such as wine by scan mode, with better confirmation of identity, and without sacrificing sensitivity, where previously SIM methodology had to be used.


Assuntos
Cromatografia Gasosa-Espectrometria de Massas/métodos , Vinho/análise , Agroquímicos/análise , Anisóis/análise , Cromatografia Gasosa-Espectrometria de Massas/instrumentação , Praguicidas/análise , Reprodutibilidade dos Testes
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