title: Evaluation of antimicrobial activity of selected plant extracts by rapid XTT colorimetry and bacterial enumeration.
abstract: The aim of this study was to screen and evaluate the antimicrobial activity of indigenous Jordanian plant extracts, dissolved in dimethylsulfoxide, using the rapid XTT assay and viable count methods. XTT rapid assay was used for the initial screening of antimicrobial activity for the plant extracts. Antimicrobial activity of potentially active plant extracts was further assessed using the "viable plate count" method. Four degrees of antimicrobial activity (high, moderate, weak and inactive) against Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa, respectively, were recorded. The plant extracts of Hypericum triquetrifolium, Ballota undulata, Ruta chalepensis, Ononis natrix, Paronychia argentea and Marrubium vulgare had shown promising antimicrobial activity. This study showed that while both XTT and viable count methods are comparable when estimating the overall antimicrobial activity of experimental substances, there is no strong linear correlation between the two methods.
authors.affiliation: Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, University of Jordan, Amman-11942, Jordan. agbakri@ju.edu.jo
authors.forename: Amal G
authors.initials: AG
authors.lastname: Al-Bakri
authors.forename: Fatma U
authors.initials: FU
authors.lastname: Afifi
mesh_terms: D000890:Anti-Infective Agents / Q000494:pharmacology*; D001412:Bacillus subtilis / Q000187:drug effects / Q000254:growth & development; D015169:Colony Count, Microbial; D003124:Colorimetry / Q000379:methods*; D004926:Escherichia coli / Q000187:drug effects / Q000254:growth & development; D005562:Formazans / Q000737:chemistry*; D007597:Jordan; D008826:Microbial Sensitivity Tests / Q000379:methods; D010936:Plant Extracts / Q000494:pharmacology*; D010946:Plants, Medicinal / Q000737:chemistry*; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000254:growth & development; D013211:Staphylococcus aureus / Q000187:drug effects / Q000254:growth & development
chemical_list: D000890:Anti-Infective Agents; D005562:Formazans; D010936:Plant Extracts; C059088:1,5-bis(2-methoxy-4-nitro-5-sulfophenyl)-3-((phenylamino)carbonyl)formazan