Prediction of the wine sensory properties related to grape variety from dynamic-headspace gas chromatography-olfactometry data.
Wine extracts obtained by a dynamic headspace sampling technique were studied by quantitative gas chromatography-olfactometry (GC-O) to determine the aroma profiles of six young monovarietal Spanish white wines. A partial least-square regression study was carried out to look for models relating wine aroma properties with GC-O scores. Models were validated by sensory analysis. Four out of the five most important sensory descriptors were satisfactorily described by a model, and sensory tests confirmed most of the predictions. The main aroma differences between these wines are due to the ratio linalool/3-mercaptohexyl acetate. Floral, sweet, and muscat are positively related to the concentration of linalool and negatively to that of 3-mercaptohexyl acetate. Tropical fruit is related to the wine content in this last odorant. 2-Phenyl acetate, reinforced by other acetates, can also contribute to floral and sweet notes. Alkyl-methoxypyrazines lessen the tropical fruit note, and acetic acid lessens the muscat nuance.
Department of Analytical Chemistry, Science Faculty, Universidad de Zaragoza, 50009 Zaragoza, Spain.
Eva
E
Campo
Vicente
V
Ferreira
Ana
A
Escudero
Juan
J
Cacho
D000080462:Acyclic Monoterpenes; D000328:Adult; D002849:Chromatography, Gas / Q000379:methods*; D005260:Female; D005638:Fruit / Q000737:chemistry / Q000145:classification*; D006801:Humans; D008297:Male; D039821:Monoterpenes / Q000032:analysis; D009812:Odorants / Q000032:analysis*; D010648:Phenylacetates / Q000032:analysis; D012903:Smell; D013045:Species Specificity; D027843:Vitis / Q000737:chemistry / Q000145:classification*; D014920:Wine / Q000032:analysis*
D000080462:Acyclic Monoterpenes; D039821:Monoterpenes; D010648:Phenylacetates; C018584:linalool; C025136:phenylacetic acid