Abstract
Bacterial resistance to antibiotics has become a global problem impacted partly by use of antibiotics in various environments. New antimicrobial agents are therefore urgently needed to overcome this problem. This study was carried out to investigate the tetracycline (TC) and ampicillin (AMP) resistant bacteria in wastewater environments of Rajshahi Metropolitan City, Bangladesh. In this investigation ethanol and acetone extracts of Dryopteris sp. (leaves), Pteris vittata L. (leaves) and Nigella sativa L. (seeds) were examined for their antibacterial activity. A total of 34 TC and AMP resistant bacteria were isolated from wastewater sources. Among them, a random selection of eight strains (three gram negative and 5 gram positive) was used for this study. The zone of inhibition for Dryopteris sp. leaves ranged from 6-11 mm and 6-12 mm and for Pteris vittata L. leaf extract, from 6-12 mm and 6-13 mm within ethanol and acetone extracts, respectively. Acetone extract of Nigella sativa L. seeds at the concentration of 2500 µg/ml had a marked sensitivity (7-18 mm) towards three tested gram positive bacteria in this study. The results of the present work provide essential baseline information for the use of the studied plants in the fight against drug resistant phenotypes.
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