Global volatile signature and polyphenols patterns in Vespolina wines according to vintage

The global volatile signature of Vespolina wines from different vintages was established using solid-phase microextraction combined with gas chromatography-mass spectrometry (HS-SPME/GC-qMS). Wines were also characterised in terms of bioactive compounds (such as individual polyphenols, biogenic amines and their precursors) by high-performance liquid chromatography (RP-HPLC). In addition, some physicochemical parameters, such as the total phenolic content, total tannins and antioxidant capacity, were evaluated. Seventy-one volatile compounds and thirty-three bioactive compounds were identified in Vespolina wines. The application of multivariate analysis to the obtained data revealed that 2-phenylethyl acetate, ethyl nonanoate, 2-hexanol, isoamyl octanoate and ethyl 2-hydroxymethylbutanoate were the primary compounds responsible for Vespolina wines classification, mainly indicative for wines of 2015 and 2013 vintages. Conversely, wines from 2008 and 2009 vintages showed highest values of procyanidin B1, catechin, gallic acid,trans-piceid andtrans-resveratrol.

Automated summary

Multivariate analysis of the data indicated that compounds like 2-phenylethyl acetate, ethyl nonanoate, 2-hexanol, isoamyl octanoate, and ethyl 2-hydroxymethylbutanoate were the primary ones responsible for classifying Vespolina wines, especially for those from the 2015 and 2013 vintages. On the other hand, wines from the 2008 and 2009 vintages exhibited the highest levels of procyanidin B1, catechin, gallic acid, trans-piceid, and trans-resveratrol.