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- Title
Rapid Determination of Total Thujone in Absinthe Using ¹H NMR Spectroscopy.
- Authors
Monakhova, Yulia B.; Kuballa, Thomas; Lachenmeier, Dirk W.
- Abstract
¹H NMR spectroscopy is utilized to quantify total thujone (sum of α- and β-isomers) in absinthe. For sample preparation, a simple dilution with buffer is required. Thujone produces a distinct peak of the CH2 group in the cyclopentanone moiety in the 2.13-2.11 ppm range. No overlap with other typical constituents such as anethole or fenchone occurs. The detection limit of 0.3mg/L is adequate to control the EU maximumlimit. The relative standard deviation was 6%, and linearity was observed from 1 to 100 mg/L. Applicability was proven by analysis of 69 authentic absinthes. The correlation between NMR and our previous method consisting of liquid-liquid extraction followed by GC/MS was significant (P < 0.0001,R = 0.93). The simple and cheap NMR method can be used for rapid screening of absinthes for total thujone content while chromatographic techniques are recommended for more specific (α- and β-thujone isomers) analysis if required.
- Subjects
ABSINTHE; NUCLEAR magnetic resonance spectroscopy; ISOMERS; EXTRACTION (Chemistry); CHROMATOGRAPHIC analysis
- Publication
International Journal of Spectroscopy, 2011, p1
- ISSN
1687-9449
- Publication type
Article
- DOI
10.1155/2011/171684