According to Scheu (5), a "pure chemical race" is defined using one oil component, which can be unequivocally considered as the main component. However, another way of defining a chemotype is to observe the whole peak distribution of the chromatogram (6). For example, following crossings between
In phytochemical and chemotaxonomic research work mass spectrometry plays an outstandingly important role. Using gas chromatography/mass spectrometry (GC/MS) we established the chemotaxa of Tanacetum vulgare L. Chemotypes with essential oils containing 60-90% of artemisia ketone, carveol,