title: Adhesion of PLGA or Eudragit/PLGA nanoparticles to Staphylococcus and Pseudomonas.
abstract: The aim of present study was to examine whether cationic Eudragit containing poly(lactide-co-glycolide) (PLGA) nanoparticles can adhere to Pseudomonas aeruginosa and Staphylococcus aureus. In order to prepare fluorescent nanoparticles, fluorescein was covalently coupled to PLGA. Fluorescent PLGA and Eudragit/PLGA nanoparticles were prepared by w/o/w emulsification solvent evaporation. Particle size and zeta potential of the nanoparticles were measured. Nanoparticles were incubated for a short time with P. aeruginosa and S. aureus followed by measurement of the size of nanoparticles and of P. aeruginosa and S. aureus with and without adherent nanoparticles. Flow cytometric measurements were performed to detect the attachment of particles to microorganisms. Eudragit containing nanoparticles possessed a positive zeta potential, while PLGA nanoparticles were negatively charged. Following adsorption of Eudragit containing nanoparticles, a size increase for P. aeruginosa was observed. Flow cytometric analyses confirmed that Eudragit containing particles showed stronger interactions with the test organisms than PLGA nanoparticles. Adhesion of particles was more pronounced for P. aeruginosa than for S. aureus. Cationic Eudragit containing nanoparticles showed better adhesion to microorganisms than anionic PLGA nanoparticles, which is probably due to enhanced electrostatic interactions.
authors: Laboratory of Pharmaceutical Technology and Biopharmacy, Department of Pharmaceutical Sciences, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Antwerp, Belgium.
authors: Kathleen
authors: K
authors: Dillen
authors: Chris
authors: C
authors: Bridts
authors: Pieter
authors: P
authors: Van der Veken
authors: Paul
authors: P
authors: Cos
authors: Jo
authors: J
authors: Vandervoort
authors: Koen
authors: K
authors: Augustyns
authors: Wim
authors: W
authors: Stevens
authors: Annick
authors: A
authors: Ludwig
mesh_terms: D000268:Adhesiveness; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000494:pharmacology; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002939:Ciprofloxacin / Q000008:administration & dosage / Q000494:pharmacology; D004563:Electrochemistry; D005434:Flow Cytometry; D005452:Fluoresceins; D005456:Fluorescent Dyes; D019344:Lactic Acid; D053758:Nanoparticles; D010316:Particle Size; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers; D011109:Polymethacrylic Acids; D011550:Pseudomonas aeruginosa / Q000187:drug effects*; D013211:Staphylococcus aureus / Q000187:drug effects*
chemical_list: D000900:Anti-Bacterial Agents; D005452:Fluoresceins; D005456:Fluorescent Dyes; D011108:Polymers; D011109:Polymethacrylic Acids; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; C038300:methylmethacrylate-methacrylic acid copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D002939:Ciprofloxacin