Chemical composition of the essential oil of Centaurea grinensis Reuter and Centaurea apiculata Ledeb: Growing wild in Croatia and Bulgaria, respectively and PCA analysis of subgenus Lopholoma (Cass.) Dobrocz.

In the present study, the chemical composition of the essential oils from aerial parts ofCentaurea grinensisReuter (K) collected at Žuta Lova, near Senj (Croatia), and aerial parts (L1) and flowers (L2) ofC. apiculataLedeb. collected near Rebro village, near Breznik town, Znepole Region (Bulgaria), both belonging to subgenusLopholoma(Cass.) Dobrocz, was evaluated by GC and GC-MS. The main components ofKwere 4-vinyl guaiacol (21.5%), hexadecanoic acid (16.2%), acetophenone (12.5%). Caryophyllene oxide (15.8%) together with sphathulenol (14.5%) and humulene epoxide II (9.4%) were recognized as the main constituent of both the aerial part (L1) and flowers (L2) ofC. apiculata. Furthermore, a complete review on the composition of the essential oils of all theCentaureataxa belonging to subgenusLopholomastudied so far has been inserted and cluster analysis (PCA) was carried out. [ABSTRACT FROM PUBLISHER]