For ROC analysis, ethyl hexanoate possessed the highest contribution
to gingko wine aroma (ROC = 46.5%), followed by ethyl pentanoate
(ROC = 17.6%), nonanal (ROC = 16.5%), ethyl butyrate
(ROC = 9.5%) and ethyl heptanoate (ROC = 5.0%). Interestingly,
ethyl hexanoate was identified as the second highest ROC in
Chardonnay wine (Welke et al., 2014). The total ROC of esters as
accounted for 80.2% followed by carbonyl compounds (17.5%).
Those results illustrated the key role of esters in wine aroma.