SummaryThe essential oil of hop cones ( Humulus lupulus L.) was analyzed by GC and GC-MS to assess the composition of volatiles and to evaluate olfactorially the principle aroma compounds. Myrcene (45.3%), -humulene (31.2%) and -caryophyllene (9.8%) were found to be the main constituents of this H. lupulus sample.The essential hop oil, the 3 main compounds and three minor concentrated constituents, isobutyl isobutyrate, geraniol and -pinene, were tested for their antimicrobial activities against some different strains of Gram-positive and Gramnegativebacteria as well as the yeast Candida albicans by using agar diffusion and agar dilution method, respectively. The same was done using the phenolic aroma compound eugenol and the synthetic antibiotics Ciproxin The obtained data were discussed to get more insight into the influence of pure aroma compounds on the antimicrobial activities of essential oils.

From the leaves of Crataegus davisii five flavonoids ( hyperoside, vitexin 2''-rhamnoside, vitexin 4'-rhamnoside, rutin, quercetin ) together with chlorogenic acid and crataequinone B were isolated.The flavonoid content of the leaves was determined according to DAB 10 and found as 1.09 %. The IC 50 value was found as 1.57 mg/ml at antioxidant activity determination with DPPH method.

From the aerial parts of Delphinium buschianum Grossh., collected in Turkey, a new diterpenoid alkaloid 1, named budelphine, was isolated along with the known diterpenoid alkaloids karakoline (2), 18‐hydroxy‐14‐O‐methylgadesine (3), delsoline (4), lapaconidine (5), columbianine (6), 14‐benzoylneoline (7), and hetisine (9). The structure of 1 was established on the basis of 1H‐, 13C‐, DEPT, 1H,1H‐COSY, NOESY, HSQC, and HMBC NMR studies.

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