title: Study of antimicrobial effects of vancomycin loaded PLGA nanoparticles against enterococcus clinical isolates.
abstract: Researchers have demonstrated that antimicrobial agents in nanoparticle (NP) forms have better activities. Vancomycin (VCM), as a glycopeptide antibiotic with antimicrobial activity against gram positive bacteria, is poorly absorbed from the intestinal tract. Enterococcus is a genus of bacteria that became resistant to a wide range of antibiotics in last decades, and cause severe infections in hospitalized patients. This paper describes preparation of VCM--loaded poly (lactic-co-glycolic acid) (PLGA) NPs and compares the antimicrobial effects with drug solution against clinical Enterococcus isolates. VCM-loaded PLGA NPs were fabricated by W1/O/W2 solvent evaporation method. The comparison of obtained Minimum Inhibitory Concentration (MIC) values showed a significant decrease in the antimicrobial effect of VCM -loaded NPs. Results also indicated that the potency of the NPs against VCM resistant isolates of Enterococcus was less than VCM susceptible isolates. The reduced antimicrobial effect of formulated NPs in invitro condition is perhaps related to the strong electrostatic linkage between hydrophilic drug (VCM) and hydrophobic polymer (PLGA) that lead to the slow release of the antibiotic from polymeric NPs.
authors.affiliation: Hematology and Oncology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: F
authors.initials: F
authors.lastname: Lotfipour
authors.affiliation: Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: S
authors.initials: S
authors.lastname: Abdollahi
authors.affiliation: Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Jelvehgari
authors.affiliation: Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: H
authors.initials: H
authors.lastname: Valizadeh
authors.affiliation: Faculty of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Hassan
authors.affiliation: School of Advanced Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Milani
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry* / Q000494:pharmacology*; D004337:Drug Carriers / Q000737:chemistry; D016983:Enterococcus / Q000187:drug effects*; D019344:Lactic Acid / Q000737:chemistry*; D008826:Microbial Sensitivity Tests / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry*; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D014640:Vancomycin / Q000737:chemistry* / Q000494:pharmacology*
chemical_list: D000890:Anti-Infective Agents; D004337:Drug Carriers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D014640:Vancomycin