Antibacterial activity of important medicinal plants on human pathogenic bacteria-a comparative analysis

摘要

he use of plants in treatment of burns, dermatophytes and infectious diseases is common inudtraditional medicine. Based on ethno pharmacological and taxonomic information, antibacterial activities ofudaqueous and methanol extracts of some medicinal plants were determined by in vitro by agar diffusion-methodudagainst some human pathogenic bacteria. The leaves of five different plants,belonging to the different familyudand which have some ethnomedicinal applications were studied for antibacterial activity. Powdered leafudmaterials of all selected plants were extracted with aqueous and methanol. The solvent extracts were evaporatedudto dryness using rotary flash evaporator. Dry residue was dissolved in methanol (1:10 w/v) and tested forudantibacterial activity. The antibacterial screening of aqueous and methanol extract carried out in vitroudon the following bacteria viz.,Bacillus cereus, Bacillus megaterium, Bacillus subtilis, Escherichia coli, Klebsiellaudpneumoniae, Pseudomonas aeruginosa, Salmonella typhi, Staphylococcus aureus, Streptococcus faecalis andudYersinia enterocolitica. It has been showed that the methanol extracts had wider range of activity on theseudorganisms than the aqueous extracts, which indicates that the methanol extracts of all selected plants mayudcontain the active components. This study supports, the traditional medicines (herbal extracts) to cure manyuddiseases like diarrhea, intestinal tract, throat, ear infections, fever and skin diseases