8B Polyfunctional Thiol Compound 279
Ta b l e 8 B. 3 Assay of volatile thiols (ng/L) in Sauvignon blanc wines from the same Bordeaux
estate in several vintages (Tominaga et al. 1998a)
Compounds Compounds Samples
1992 1993 1994 1995
4-Methyl-4-sulfanylpentan-2-one 7(9) 45(50) 10(13) 44(55)
4-Methyl-4-sulfanylpentan-2-ol 46(0.8) 111(2) 25(0.5) 33(0.6)
3-Sulfanylhexan-1-ol 871(15) 1178(20) 600(10) 1686(28)
3-Sulfanylhexyl acetate 0(0) 0(0) 0.4(0.1) 2.8(0.7)
Entries in parentheses are the aromatic index of each compound: concentration/perception
threshold
3SH (ng/L) 4MSP (ng/L)0500100015002000250030003500Gewurz. Tokay Riesling Muscat4MSP3SH020406080100Fig. 8B.13SH and 4MSP concentrations in wines made from Alsace grape varieties (n=5)
(Tominaga et al. 2001)
Guth (1997) demonstrated the major olfactory impact of 4MSP in Scheurebe
wines, which may contain as much as 400 ng/L.
3SH is also present at concentrations well above its perception threshold in wines
made from Petit Manseng, Gros Manseng, Colombard, and botrytized S ́emillon
(Tominaga et al. 2000a) (Table 8B.4). This volatile thiol is present in small quan-
tities, but still above the perception threshold, in Melon de Bourgogne (Schnei-
der 2001) and Chardonnay wines (Tominaga, unpublished results). More recently,
these volatile thiols were identified in wines from the Canary Islands (Lopez
et al. 2003) and those made from Petite Arvine, a Swiss grape variety (Fretz
et al. 2005). Similarly, 3SHA is found in young dry white wines made from Petit
Manseng, Gros Manseng, and Colombard (Table 8B.4) (Tominaga et al. 2001).
The presence of 3SH was reported in red Cabernet and Merlot wines (Bouch-
illoux et al. 1998a; Kotseridis et al. 2000) and it is probably present in wine made
from other red grape varieties. However, after alcoholic fermentation, especially