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South African
Wine Lab Association:

Complementary Effect of Blending on the Volatile Composition of Albarino and Loureira White Wines (Vitis vinifera L.) from NW Spain

M. Vilanova1*, L. Freire2

Albariño and Loureira are highly valuable white grape cultivars from the Northwest Iberian Peninsula
(Northwest Spain and Northern Portugal). The purpose of this study was to determine how blending affects
the volatile composition of Albariño and Loureira white wines. Four Vitis vinifera white wines (Albariño,
Loureira, Caiño Blanco and Godello) were blended at different proportions, resulting in four wines –
two two-wine blends (83:17 Albariño-Caiño Blanco and 50:50 Loureira-Caiño Blanco) and two threewine
blends (48:32:20 Albariño-Loureira-Caiño Blanco and 35:35:30 Loureira-Caiño Blanco-Godello).
The blended wines were compared with Albariño and Loureira single wines. The volatile composition of
the wines was evaluated using gas chromatography-mass spectrometry to identify changes in the aroma
compounds of the blends with respect to the Albariño and Loureira varietal wines. The Loureira and
Albariño single wines had the highest concentrations of volatiles. However, the blended wines, especially
those with Loureira, showed increases in terpenes and C13-norisoprenoids. Discriminant analysis showed
that C6-alcohols and phenol volatiles were the variables that contributed the most to the differences
between Albariño and the blended wines, whereas terpenes and C13-norisoprenoids made the greatest
contributions to the differences between Loureira and the blended wines. The odour activity value was
calculated to analyse the sensory influence of the volatiles, and this showed the superiority of the Loureira
single wine aroma and the 50:50 Loureira-Caiño Blanco blended wines vs. Albariño and the other blended
wines. The blended wines with a high proportion of Loureira appeared to be richer in volatile compounds,
which increased the complexity of the wines’ aroma.

Blended wine, volatiles aroma;  Albariño, Loureira, Caiño blanco, Godello

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