Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume
45, Number 7, August 2007, pp. 428-434
?Determination of Volatile Compounds in Cider
Spirits by Gas Chromatography with Direct Injection
?Roberto Rodríguez Madrera and Belén
Suárez Valles
Área de Tecnología de los Alimentos, Servicio Regional
de Investigación y Desarrollo Agroalimentario (SERIDA),
33300-Villaviciosa, Asturias, Spain.
?Two analytical methods based on gas chromatography
with direct injection are described for the quantitative analysis
of volatile compounds (acetals, aldehydes, esters, alcohols,
and volatile phenols) in cider brandies. Analytes were divided
into major, 15, and minor volatile, 24, compounds depending on
their usual concentration in samples. Parameters usually tested
for method validation are evaluated. Correlation coefficients
are calculated to estimate linearity, obtaining values higher
than 0.999. Detection limits range between 0.325 mg/L (1-propanol)
and 1.663 mg/L (methanol) among the major volatile compounds
and between 0.086 mg/L (ethyl 2-methylbutyrate) and 0.332 mg/L
(ethyl tetradecanoate) among the minor volatiles. Mean recoveries
ranged between 109% (ethyl lactate) and 95% (1-butanol) for major
volatiles and between 109% (1-octen-3-ol) and 94% (ethyl 2-methylbutyrate)
for minor volatiles, thus confirming the accuracy of both methods.
Reproducibility for major volatiles is < 5.4% (furfural)
in all cases and < 9.6% (hexyl acetate) for minor volatiles.
Moreover, the accuracy of the methods is evaluated by analyzing
a certified whisky and five samples from interlaboratory assays,
generally obtaining results in accordance with previous values.
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