GC-MS IDENTIFICATION OF VOLATILE COMPONENTS OF GALICIAN (NORTHWESTERNSPAIN) WHITE WINES - APPLICATION TO DIFFERENTIATE RIAS-BAIXAS WINES FROM WINES PRODUCED IN NEARBY GEOGRAPHICAL REGIONS

A capillary gas chromatography-ion trap mass spectrometry linked techn ique improved with a programmable temperature injector was applied to identify some volatile components (more than 100 compounds) in certifi ed brand of origin (CBO) Rias Baixas white wines. Some of them have no t been previously reported in young white wines. Forty of these compon ents were determined by capillary gas chromatogtaphy with flame ionisa tion detection in Rias Baixas wines and in other Galician white wines. By means of multivariate techniques of data exploration as hierarchic al cluster analysis and principal components analysis two main groups of samples (Rias Baixas and non-Rias Baixas wines) were observed. Howe ver, some outliers were also pointed out among the two groups of wines . One sample elaborated with Albarino grapes out of the delimited Rias Baixas area showed the most anomalous behaviour. Two samples CBO Rias Baixas seemed to be produced by mixture of grape varieties not allowe d by the CBO regulations. Exploratory analysis results were confirmed using supervised techniques of data classification as K-nearest neighb ours and soft independent modelling of class analogies.