Table 4.
Organic acid contents (mg/L) of distillates ageing in barrel of American, French and Spanish oak, and Chestnut.
| Initial | American Oak | French Oak | Spanish Oak | Chestnut | |||||
|---|---|---|---|---|---|---|---|---|---|
| Intense Toast | Medium Toast | Intense Toast | Medium Toast | Intense Toast | Medium Toast | Intense Toast | Medium Toast | ||
| Succinic ac. | n.d. | 30.1 ± 4.7 b | 25.9 ± 0.3 a,b | 27.6 ± 0.1 b | 19.2 ± 0.9 a | 27.2 ± 0.4 b | 25.0 ± 0.0 a,b | 31.7 ± 0.5 b | 28.4 ± 1.9 b |
| Lactic ac. | 181.6 ± 4.4 a | 403.8 ± 49.9 b | 367.5 ± 2.5 b | 338.9 ± 0.8 b | 333.5 ± 1.8 b | 175.2 ± 6.0 a | 173.6 ± 0.7 a | 188.7 ± 13.1 a | 180.2 ± 14.2 a |
| Acetic ac. | 127.6 ± 0.1 a | 307.6 ± 32.7 d | 265.6 ± 3.7 c,d | 266.2 ± 3.7 c,d | 247.9 ± 6.3 b,c | 227.9 ± 7.1 b,c | 210.1 ± 4.9 b | 243.7 ± 3.6 b,c | 259.1 ± 1.6 c |
Data are mean value ± standard deviation; values in the same row with different letters are significantly different (p < 0.05). n.d.: Not detected.