GC-IRMS IN THE AUTHENTICITY CONTROL OF THE ESSENTIAL OIL OF CORIANDRUM-SATIVUM L

The essential oils of 10 authentic coriander samples of different orig in were analyzed. Capillary gas chromatography, on-line coupled with i sotope ratio mass spectrometry (cGC-IRMS) using Stabilwax as the stati onary phase, was applied. Alternatively, hyl-6-O-tert-butyldimethylsil yl)-beta-cyclodextrin in PS 268 was used as the chiral stationary phas e. The enantiomeric ratio and the delta(13)C(PDB) values of some chara cteristic-compounds were compared with those of commercially available spices and essential oils. The influence of isotopic effects on the d elta values during the primary CO2 fixation was eliminated by definiti on of a suitable internal isotopic standard (i-IST). The isotopic effe cts among genuine monoterpenes are, therefore, exclusively determined by the influence of enzymatic reactions during secondary biogenetic pa thways.