title: Studies on antimicrobial activity, in vitro, of Physalis angulata L. (Solanaceae) fraction and physalin B bringing out the importance of assay determination.
abstract: Complex physalin metabolites present in the capsules of the fruit of Physalis angulata L. have been isolated and submitted to a series of assays of antimicrobial activity against Pseudomonas aeruginosa ATCC 27853, Staphylococcus aureus ATCC 29213, S. aureus ATCC 25923, S. aureus ATCC 6538P, Neisseria gonorrhoeae ATCC 49226, Escherichia coli ATCC 8739; E. coli ATCC 25922, Candida albicans ATCC 10231 applying different methodologies such as: bioautography, dilution broth, dilution agar, and agar diffusion techniques. A mixture of physalins (pool) containing physalins B, D, F, G inhibit S. aureus ATCC 29213, S. aureus ATCC 25923, S. aureus ATCC 6538P, and N. gonorrhoeae ATCC 49226 at a concentration of 200 mg/microl, using agar dilution assays. The mixture was inactive against P. aeruginosa ATCC27853, E. coli ATCC 8739; E. coli ATCC 25922, C. albicans ATCC 10231 when applying bioautography assays. Physalin B (200 microg/ml) by the agar diffusion assay inhibited S. aureus ATCC 6538P by +/- 85%; and may be considered responsible for the antimicrobial activity.
authors.affiliation: Laboratório de Química de Produtos Naturais, Far-Manguinhos, Rio de Janeiro, RJ, Brazil. melissa@far.fiocruz.br
authors.forename: Melissa T G
authors.initials: MT
authors.lastname: Silva
authors.forename: Sonia M
authors.initials: SM
authors.lastname: Simas
authors.forename: Terezinha G F M
authors.initials: TG
authors.lastname: Batista
authors.forename: Paola
authors.initials: P
authors.lastname: Cardarelli
authors.forename: Therezinha C B
authors.initials: TC
authors.lastname: Tomassini
mesh_terms: D000362:Agar; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D002176:Candida albicans / Q000187:drug effects*; D003470:Culture Media; D004353:Drug Evaluation, Preclinical; D006090:Gram-Negative Bacteria / Q000187:drug effects*; D006094:Gram-Positive Bacteria / Q000187:drug effects*; D007783:Lactones / Q000627:therapeutic use*; D008826:Microbial Sensitivity Tests / Q000379:methods; D032321:Physalis; D010936:Plant Extracts / Q000494:pharmacology; D012632:Secosteroids; D013256:Steroids / Q000627:therapeutic use*
chemical_list: D000900:Anti-Bacterial Agents; D003470:Culture Media; D007783:Lactones; D010936:Plant Extracts; D012632:Secosteroids; D013256:Steroids; C033270:physalin B; D000362:Agar