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Cyanus  Mill. genus, belonging to the Asteraceae family, includes more than 50 taxa, mainly growing in Central and Southern Europe, North Africa, Asia Minor, and the Caucasus. Previous investigations on  Cyanus  taxa have shown that they are rich source of flavonoids and phenolic compounds but, differently from species of genus  Centaurea , almost devoid of sesquiterpene lactones. In the present study, the chemical composition of the essential oils from aerial parts of  Cyanus adscendens  ( CA ) and  C. orbelicus  ( CO ), collected in Bulgaria, and not previously investigated, was evaluated by GC-MS. The main components of  CA  were  α -bergamotene (31.3%), ( Z,Z,Z )-9,12,15-octadecatrien-1-ol (14.5%) and calarenepoxide (11.0%). Caryophyllene oxide (12.0%), together with  α -cadinol (10.9%) and spathulenol (8.8%), were recognized as the main constituent of  C. orbelicus  EO. Furthermore, a complete review on the composition of all essential oils of the  Cyanus  taxa studied so far has been inserted and cluster analysis (PCA) was carried out.

natural product research

Chemical composition of the essential oil of  Cyanus adscendens  (Bartl.) Soják and  C. orbelicus  (Velen.) Soják growing wild in Bulgaria, and PCA analysis of genus  Cyanus  Mill.