Sensory Impact of Extended Maceration and Regulated Deficit Irrigation on Washington State Cabernet Sauvignon Wines

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Figure 1
Principal component analysis of descriptive sensory data of Cabernet Sauvignon wines evaluated by a trained panel (n = 15): (A) confidence ellipses based on multivariate distribution of Hotelling’s test for p < 0.05 indicating 95% confidence intervals and (B) sensory loadings. RDI treatments: 100% ET_c, 70% ET_c, and 25% ET_c represent replenishment of 100%, 70%, and 25%, respectively, of full-vine ET_c from fruit set through harvest; 25/100% ET_c represents 25% ET_c from fruit set to veraison followed by 100% ET_c from veraison to harvest. Winemaking treatments: C, control (10 days skin contact); EM, extended maceration (30 days skin contact).
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Figure 2
Canonical correlation analysis showing clustered image maps of the correlation between significant sensory and chemical attributes considering all wines (n = 16) in the experiment. The dark red and blue colors indicate positive and negative correlation coefficient values, respectively, whereas light green colors indicate near zero correlation coefficient values. Cluster membership within sensory and chemical data is indicated as different shades of grey and black. L*: lightness; PAs: proanthocyanidins; b*: yellow component; H*: hue; a*: red component; C*: saturation.

Table 1
Ingredients, specifications, and lexicon of sensory analysis standards used during the training and formal evaluation sessions.
Table 2
One-way ANOVA of CIELab color parameters of Cabernet Sauvignon wines subjected to four different regulated deficit irrigation regimes (RDI) and two skin contact time treatments (EM) at day 250 postcrushing.
Table 3
One-way ANOVA of selected phenolic parameters of Cabernet Sauvignon wines subjected to four different regulated deficit irrigation regimes (RDI) and two skin contact time treatments at day 250 postcrushing.
Table 4
One-way ANOVA of protein-precipitable tannins (PPT), proanthocyanidin (PA) composition, and proportion of skin- and seed-derived tannins of Cabernet Sauvignon wines subjected to four different regulated deficit irrigation regimes (RDI) and two skin contact time treatments at day 250 postcrushing.
Table 5
Main effects and interaction of descriptive sensory attributes (n = 15) of Cabernet Sauvignon wines subjected to four different regulated deficit irrigation regimes (RDI) and two skin contact (SC) time treatments.
Table 6
One-way ANOVA of descriptive sensory attributes (n = 15) of Cabernet Sauvignon wines subjected to four different regulated deficit irrigation regimes (RDI) and two skin contact (SC) time treatments.