Enantiomer composition of chiral compounds present in traditional Slovak Tokaj wines

• Published in: Journal of food composition and analysis 2021-03, Vol.96, p.103719, Article 103719
• Main Authors: Khvalbota, Liudmyla, Machyňáková, Andrea, Čuchorová, Justína, Furdíková, Katarína, Špánik, Ivan
• Format: Article
• Language: English
• Subjects: Botrytized wines; Enantioselective gas chromatography; Multidimensional gas chromatography; Solid phase microextraction; Tokaj
• ISSN: 0889-1575; 1096-0481
• DOI: 10.1016/j.jfca.2020.103719

[Display omitted] •VOC profiles of traditional Slovak Tokaj wines were characterized.•Heart-cut 2D-GC chiral separation of three compounds was optimized.•Enantiomeric ratios of seven compounds were determined. In the presented study volatile organic compounds (VOC) profiles of the most valuable products from Slovak Tokaj wine region were characterized using SPME-GC-MS. Identified volatile organic compounds in studied samples of Tokaj selection wines and Tokaj essences belonged to esters, terpenes, higher alcohols, volatile acids, lactones and aldehydes. From identified VOC, chiral compounds were selected, and their enantiomers were separated by heart-cut two-dimensional GC system. Enantiomer separation was optimized, and this advanced method was applied to determine enantiomeric ratios (ER) of studied compounds in 53 traditional botrytized Tokaj wines. Terpenic compounds linalool and limonene were present in ER resembling the racemic mixture, hotrienol expressed the slight dominancy of S-enantiomer (51–82 %) and S-α-terpineol varied from 47 to 70 %. Moreover, linalool and limonene were present only in wines of younger vintages. ER of 2,3-butanediol has shown the predominance of 2R,3R-enantiomer in all samples even though reached also values that were not usual for common white wines (55–100 %). Whiskey lactones were identified in all wines aged in oak barrels and exclusive presence of (4S,5S)-cis- and (4S,5R)-trans- enantiomers was confirmed.