2002•CINECA IRIS Institutional Research Information System (Fondazione Edmund Mach)Requires access
Aroma variation in Tannat wines: effect of malolactic fermentation on ethyl lactate level and its enentiometric distribution
Adriana Lloret, Boido, D., De Lorenzo, Karina Medina, Francisco Carrau, Eduardo S. Dellacassa, Giuseppe Versini
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Abstract
The chirality of ethyl lactate was evaluated in an attempt to explain possible scents present in Tannat wines. Wines without malolactic fermentation (MLF) (ethyl lactate values from 5 to 8 mg/L) had a 69% enantiomeric excess of (R)-ethyl lactate, while with MLF (ethyl lactate values from 90 to 150 mg/L), this value decreased to 22-28%, depending on the inoculant strain. The (S)-ethyl lactate concentration increased significantly after MLF (65-130 mg/L) compared with the non-MLF control wine (1.5-2.5 mg/L). The aromatic impact of the (S)-enantiomer was confirmed by determining its aroma threshold in wine (110 mg/L).