Analysis for wine C5-C8 aldehydes through the determination of their O-(2,3,4,5,6-pentafluorobenzyl)oximes formed directly in the solid phase ... [An article from: Analytica Chimica Acta]

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Description:
A method for the determination of wine carbonyl compounds with 5-8 carbon atoms including 3-methylbutanal, E-2-hexenal, E-2-heptenal, E-2-octenal and phenylacetaldehyde has been developed. Aldehydes are retained in a solid phase extraction cartridge and derivatization with O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine takes place in the same cartridge at room temperature (25^oC) in 15min. The corresponding oximes are further eluted and determined by gas chromatography-mass spectrometry. Isolation, derivatization and elution conditions were examined. Recoveries from red wines are all >94%, and are consistent from wine to wine. For white wines, recoveries for E-2-heptenal, E-2-octenal and phenylacetaldehyde are 80-85%, but are consistent from wine to wine. Precision (measured as relative standard deviation) is