PHYTOCHEMICAL ANALYSIS AND ANTIBACTERIAL ACTIVITY OF METHANOLIC AND AQUEOUS EXTRACTS OF EUCALYPTUS BLAKELYI AND EUCALYPTUS CLADOCALYX LEAVES

Abstract

In this study, we evaluated the chemical composition and antibacterial activity of the methanolic and aqueous extracts of Eucalyptus blakelyi and Eucalyptus cladocalyx leaves collected from Bainem (Algeria). The phytochemical screening results showed that both extracts of these species contained tannins, flavonoids, quinones, coumarines, glycosides, and anthraquinones, in addition to these, methanolic extract was found to contain saponins and alkaloids. Antibacterial activity of the leaf extracts was evaluated against seven bacterial strains. E. blakelyi methanolic and aqueous extracts inhibited the growth of the majority of bacterial strains with significant inhibition against Bacillus subtilis (19.56 mm and 15.13 mm respectively). E. cladocalyx methanolic extract had good inhibitory activity against Micrococcus luteus (14.33 mm). Based on these results, E. blakelyi could be used as a significant source for the secondary metabolites with interesting medicinal properties

Keywords

• eucalyptus blakelyi
• eucalyptus cladocalyx
• methanolic extract
• aqueous extract
• chemical composition