Projection of principal component analysis data from the sensory characteristics of vine leaves infusion samples analyzed: loading plots (A) and scores-plot (B).

CH = color hue; CI = color intensity; AI = aroma intensity; AST = astringency; BTSS = bitterness; SWT = sweetness; GAP = global appreciation TN 30 = Touriga Nacional infusion from leaves collected 30 days after grape harvest; TN 60 = Touriga Nacional infusion from leaves collected 60 days after grape harvest; TR 30 = Tinta Roriz infusion from leaves collected 30 days after grape harvest; TR 60 = Tinta Roriz infusion from leaves collected 60 days after grape harvest.