3.2. Esters
Fig. 2 shows the results for esters in wines from grapes treated
with the six fungicides studied. The concentration of isoamyl acetate
was higher in wines from grapes treated with kresoximmethyl
(K) than in the other ones, which did not show significant
differences between them (Fig. 2a). In the case of 2-phenylethyl
acetate, greater variability among wines was found, and the concentration
was higher in wines from grapes treated with kresoxim-
methyl (K), and quinoxyfen (Q) than in the others (Fig. 2b).
The results for ethyl hexanoate and octanoate were similar to those
obtained for isoamyl acetate, with their concentrations in wines
from kresoxim-methyl (K) treatment being higher than in the
other wines (Fig. 2c–d). The concentration of ethyl decanoate
was higher in wines from grapes treated with famoxadone (F), fluquinconazole
(FL), and kresoxim-methyl (K) than in the others,
which did not show significant differences with the control wine.
Only the wine from grapes treated with fenhexamid (FH) showed
lower concentration than the control wine for this ester (Fig. 2e).
Regarding diethyl succinate concentration, no significant difference
was observed between wines from the different treatments
(Fig. 2f). Oliva et al. (2008) also observed that wines from grapes
treated with kresoxim-methyl showed the highest concentration
in acetate and ethyl esters in spontaneous fermentations, although
with lower differences than in this work. This may be due to the
esters’ synthesis being higher in inoculated than in spontaneous
fermentations