title: In vitro antibacterial potential of Eugenia jambolana seed extracts against multidrug-resistant human bacterial pathogens.
abstract: The present study was carried out to evaluate the possible in vitro antibacterial potential of extracts of Eugenia jambolana seeds against multidrug-resistant human bacterial pathogens. Agar well diffusion and microbroth dilution assay methods were used for antibacterial susceptibility testing. Kill-kinetics study was done to know the rate and extent of bacterial killing. Phytochemical analysis and TLC-bioautography were performed by colour tests to characterize the putative compounds responsible for this antibacterial activity. Cytotoxic potential was evaluated on human erythrocytes by haemolytic assay method and acute oral toxicity study was done in mice. The plant extracts demonstrated varying degrees of strain specific antibacterial activity against all the test isolates. Further, ethyl acetate fraction obtained from fractionation of most active ethanol extract showed maximum antibacterial effect against all the test isolates. Phytochemical analysis and TLC-bioautography of ethyl acetate fraction revealed that phenolics were the major active phytoconstituents. Ethyl acetate fraction also demonstrated no haemolytic activity on human erythrocytes and no gross behavioural changes as well as toxic symptoms were observed in mice at recommended dosage level. The results provide justification for the use of E. jambolana in folk medicine to treat various infectious diseases and may contribute to the development of novel antimicrobial agents for the treatment of infections caused by these drug-resistant bacterial pathogens.
authors.affiliation: Agricultural and Ecological Research Unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, Kolkata 700108, India.
authors.forename: Anwesa
authors.initials: A
authors.lastname: Bag
authors.forename: Subir Kumar
authors.initials: SK
authors.lastname: Bhattacharyya
authors.forename: Nishith Kumar
authors.initials: NK
authors.lastname: Pal
authors.forename: Rabi Ranjan
authors.initials: RR
authors.lastname: Chattopadhyay
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000302:isolation & purification / Q000494:pharmacology* / Q000633:toxicity; D001419:Bacteria / Q000187:drug effects*; D001522:Behavior, Animal / Q000187:drug effects; D002855:Chromatography, Thin Layer; D024901:Drug Resistance, Multiple, Bacterial; D004912:Erythrocytes / Q000187:drug effects; D006461:Hemolysis; D006801:Humans; D051379:Mice; D008826:Microbial Sensitivity Tests / Q000379:methods; D050296:Microbial Viability / Q000187:drug effects; D010936:Plant Extracts / Q000302:isolation & purification / Q000494:pharmacology* / Q000633:toxicity; D012639:Seeds / Q000737:chemistry; D027842:Syzygium / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D010936:Plant Extracts