Long-term stability of thujone, fenchone, and pinocamphone in vintage preban absinthe.
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 beta-thujone content and a concurrent decoloration. 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 reanalysis of samples from 2001-2005, which exhibited no changes in thujone content as of 2008. A previous evaluation of preban absinthe was therefore valid and not confounded by significant thujone deterioration over time.
Lachenmeier
Dirk W
DW
Chemisches und Veterinaruntersuchungsamt Karlsruhe, Weissenburger Strasse 3, D-76187 Karlsruhe, Germany. Lachenmeier@web.de
Nathan-Maister
David
D
Breaux
Theodore A
TA
Kuballa
Thomas
T
D018646:Absinthe / Q000032:analysis*; D000081008:Bicyclic Monoterpenes; D001892:Camphanes / Q000032:analysis*; D004355:Drug Stability; D018857:Food Packaging; D005898:Glass; D039821:Monoterpenes / Q000032:analysis*; D009636:Norbornanes / Q000032:analysis*; D014466:Ultraviolet Rays
D000081008:Bicyclic Monoterpenes; D001892:Camphanes; D039821:Monoterpenes; D009636:Norbornanes; C027327:fenchone; C021317:pinocamphone; C005790:beta-thujone