Table 1.
Average peak area (×105) and standard deviation of volatile compounds determined by SPME-GC-MS from vine leaves infusion of Touriga Nacional and Tinta Roriz leaves collected in two different dates.
| Vine leaves infusions | ||||
|---|---|---|---|---|
| Compounds (sensorial attributes) | Touriga Nacional | Tinta Roriz | ||
| 30 d (I) | 60 d (II) | 30 d | 60 d | |
| Heptane-1,2,4,6-tetraene | nd | 15.4a±1.5 (6.8%) | 12.8a±8.7 (2.1%) | 14.9a±0.05 (7.0%) |
| 6-Methyl-5-hepten-2-one (wood, currant) | 45.1b±1.0 (4.7%) (III) | 35.9ab±3.5 (16%) | 44.0ab±0.3 (7.4%) | 35.4ab±0.2 (17%) |
| 1,6-Octadien-3-ol,3,7-Dimethyl (mushroom) | 105.9a±39.2 (11%) | 62.8b±0.1 (28%) | 47.8b±0.2 (8.0%) | 48.5b±4.3 (23%) |
| 1-Undecene (burnt) | nd | 1.0a±0.1 (0.4%) | 18.7b±1.3 (3.1%) | 11.6a±0.7 (5.5%) |
| Z-Citral (lemon) | nd | 24.8ab±8.2 (11%) | nd | 35.5b±1.0 (17%) |
| 5,9 -Undecadien-2-one-6,10-dimethyl-(5E) | 32.6a±9.6 (3.5%) | 39.6a±0.1 (18%) | 36.4a±0.03 (6.1%) | 28.7a±0.5 (14%) |
| Cyclohexene, 1-methyl-4-(1-methylethyl) | nd | nd | 5.3a±0.04 (0.9%) | 31.1b±0.5 (15%) |
| Cedrenol (cedar wood) | 42.2d±3.9 (4.5%) | 45.8d±5.8 (20%) | nd | 5.8ab±1.2 (2.7%) |
| DL-Limonene (citrus) | 33.6a±3.7 (3.6%) | nd | nd | nd |
| 2,4-Hexadien-2-ol (geranium, leaves) | nd | nd | 7.7b±0.06 (1.3%) | nd |
| α-Cedrol (amphora) | nd | nd | 10.7±3.1 (1.8%) | nd |
| Benzaldehyde (almond) | 683.9b±19.8 (73%) | nd | 414.4ab±50.6 (69%) | nd |
| Total average peak area | 943.2b | 225.2a | 597.7c | 211.5a |
(I) 30 days after grape harvest; (II) 60 days after grape harvest; (III) percentage area of each compound; data given as area units of chromatograph peaks; nd = not detected; in brackets are shown some of the sensory attributes for the volatile compounds analyzed. Different letters indicates the existence of statistical differences for each line (p<0.05) by Ducan Test.
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