Evaluation of in vitro antibacterial activity and phytochemical screening of nigella sativa leaves extracts against human pathogenic bacteria

Objective: The current study objective was to explore the antimicrobial activity and phytochemical screening (Alkaloids, Flavonoid, Saponins, Phenolic compounds, terpenoid) of leaves extract of Nigella sativa. Study Design: Experimental study Place and duration of study: The current study was performed in Department Medical Laboratory Technology (MLT) at the University of Haripur. Haripur, Khyber Pakhtunkhwa, Pakistan from March 2021 to February 2022. Methods: Antimicrobial susceptibility test was done on Muller Hinton agar (MHA) using the disk diffusion method. Screening of N. sativa leaves extracts against Gram-positive bacteria Methicillin-resistant Staphylococcus aureus (MRSA) and Gram-negative bacteria Pseudomonas aeruginosa, Salmonella species, Escherichia coli and Klebsiella pneumonia were carried out using standard methods. Results: The results showed that ethanol, chloroform, hexane extract of nigella sativa had the best antimicrobial activity against P. aeruginosa, Methicillin-resistant S. aureus, Salmonella species, E. coli and K. pneumonia. Leaves extract of N. sativa were found to contain terpenoid, flavonoid, alkaloids, phenolic compounds except for saponins. Nigella sativa leaves showed good antibacterial activity against clinical multi-drug resistant bacteria. Conclusions: The results of this study provide useful bioactive compounds that show strong antibacterial activity against different multi drug resistant (MDR) including gram negative and gram positive bacteria.