Discrimination of French wine brandy origin by PTR-MS headspace analysis using ethanol ionization and sensory assessment was written by Malfondet, Nicolas;Brunerie, Pascal;Le Quere, Jean-Luc. And the article was included in Analytical and Bioanalytical Chemistry in 2021.Electric Literature of C6H10O2 This article mentions the following:
The headspace volatile organic compound (VOC) fingerprints (volatilome) of French wine brandies were investigated by proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS). Protonated ethanol chem. ionization was used with dedicated exptl. conditions that were previously validated for model wines. These included a reference vial containing a hydro-alc. solution with the same ethanol content (20% volume/volume) as the diluted sample spirits, which was used to establish steady-state ionization conditions. A low elec. field strength to number d. ratio E/N (85 Td) was used in the drift tube in order to limit the fragmentation of the protonated analytes. The obtained headspace fingerprints were used to investigate the origin of French brandies produced within a limited geog. production area. Brandies of two different vintages (one freshly distilled and one aged for 14 years in French oak barrels) were successfully classified according to their growth areas using unsupervised (principal component anal., PCA) and supervised (partial least squares regression discriminant anal., PLS-DA) multivariate analyses. The models obtained by PLS-DA allowed the identification of discriminant volatile compounds that were mainly characterised as key aroma compounds of wine brandies. The discrimination was supported by sensory evaluation conducted with free sorting tasks. The results showed that this ethanol ionization method was suitable for direct headspace anal. of brandies. They also demonstrated its ability to distinguish French brandies according to their growth areas, and this effect on brandy VOC composition was confirmed at a perceptive level. In the experiment, the researchers used many compounds, for example, 5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7Electric Literature of C6H10O2).
5-Ethyldihydrofuran-2(3H)-one (cas: 695-06-7) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Electric Literature of C6H10O2
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics