title: Structure--antimicrobial activity of some natural isocoumarins and their analogues.
abstract: Three naturally occurring isocoumarins (paepalantine, paepalantine 9-O-beta-D-glucopyranoside and paepalantine 9-O-beta-D-allopyranosyl(1 --> 6) glucopyranoside) and two semi-synthetic analogues, 9,10-acylated compound and 9-OH-10-methylated compound, structurally similar to paepalantine, were evaluated for antimicrobial activity using a spectrophotometric microdilution technique. The paepalantine was active against S. aureus, S. epidermidis, and E. faecalis while the other four compounds proved ineffective against all microorganisms tested at concentrations of 500 microg/ml. Variations in phenolic substitution at OH-9 and/or OH-10 in the paepalantine molecule resulted in compounds without antimicrobial activity. A combination of structural features, two phenolic groups as cathecolic system, forms an oxygenated system arrangement that may reflect the potentially antimicrobial properties of paepalantine.
authors.affiliation: Instituto de Química de Araraquara, Universidade Estadual Paulista-UNESP, Araraquara, São Paulo, Brazil.
authors.forename: K Ferrazzoli
authors.initials: KF
authors.lastname: Devienne
authors.forename: Gonçalves
authors.initials: G
authors.lastname: Raddi
authors.forename: R Gomes
authors.initials: RG
authors.lastname: Coelho
authors.forename: W
authors.initials: W
authors.lastname: Vilegas
mesh_terms: D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D001419:Bacteria / Q000187:drug effects*; D003374:Coumarins / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use; D013293:Enterococcus faecalis / Q000187:drug effects; D039262:Eriocaulaceae; D004926:Escherichia coli / Q000187:drug effects; D006801:Humans; D008826:Microbial Sensitivity Tests; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D013211:Staphylococcus aureus / Q000187:drug effects; D013329:Structure-Activity Relationship
chemical_list: D000900:Anti-Bacterial Agents; D003374:Coumarins; D010936:Plant Extracts