STUDIES ON ANTIMICROBIAL ACTIVITY OF HIBISCUS SPECIES OF KARNATAKA AGAINST CLINICAL ISOLATES

Antimicrobial activity of the various species of Hibiscus like Hibiscus sabdariff, Hibiscus rosa-sinensis, Hibiscus trionum, Hibiscus cannabinus, Hibiscus mutabilis against various pathogens like Staphylococcus aureus, E. coli, Bacillus subtilis, Streptococcus species, Salmonella typhimurium, Klebsiella pneumonia, Pseudomonas aeruginosa, Serratia marcescens, were studied with the help of agar well diffusion method. The solvent extracts like Methanol, Ethanol, Chloroform, Acetone, Diethyl ether of all the samples were used to measure the antimicrobial activity by using Muller-Hinton agar plates which showed the highest zone of inhibition against Staphylococcus aureus, Pseudomonas aeruginosa. In Hibiscus sabdariff, Methanol, Chloroform, and Acetone extract showed the highest zone of inhibition against Staphylococcus aureus, Pseudomonas aeruginosa and Klebsiella pneumonia. In Hibiscus rosa-sinensis, Methanol and Acetone showed the highest zone of inhibition against Streptococcus species, Pseudomonas aeruginosa and Klebsiella pneumonia. Chloroform showed the highest zone of inhibition against Streptococcus species. In Hibiscus surattensis, Chloroform showed the highest zone of inhibition against E. coli. Methanol, Chloroform, and Acetone showed the highest zone of inhibition against Serratia marcescens. All the pathogens were resistant to ethanol. E. coli and Bacillus subtilis showed the least zone of inhibition against all the extracts. In all the plant samples, all the pathogens were resistant to Diethyl ether extract except for Streptococcus species and E. coli, which showed least susceptible to it.