|Published Scientific Papers on Thujone
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Long-Term Stability of Thujone, Fenchone, and Pinocamphone in vintage Preban
by Dirk W. Lachenmeier, David Nathan-Maister, Theodore A. Breaux and Thomas Kuballa
Published in Journal of Agricultural and Food Chemistry, Volume 57, No 7, 2009
Research was conducted to ascertain whether analyses of vintage absinthe samples represent their original composition in the early
1900s. Absinthe stored in traditional green glass bottles and irradiated with ultraviolet light for up to 200 h exhibited unchanged
composition. Samples stored in clear glass exhibited an 18% reduction in -thujone content and a concurrent de-coloration. These
experiments indicate the stability of thujone in vintage absinthes, as these were stored in green glass bottles. The preserved color of
the preban absinthes subjected to analysis indicates that no significant light exposure occurred throughout the duration of storage, and
therefore provides indirect proof that no loss of terpenes occurred. The stability of absinthe was further demonstrated through the re-
analysis of samples from 2001-2005, which exhibited no changes in thujone content as of 2008. Our previous evaluation of preban
absinthe was therefore valid, and not confounded by significant thujone deterioration over time.