title: Synthesis and surface immobilization of antibacterial hybrid silver-poly(l-lactide) nanoparticles.
abstract: Infections associated with medical devices are a substantial healthcare problem. Consequently, there has been increasing research and technological efforts directed toward the development of coatings that are capable of preventing bacterial colonization of the device surface. Herein, we report on novel hybrid silver loaded poly(L-lactic acid) nanoparticles (PLLA-AgNPs) with narrowly distributed sizes (17 ± 3 nm) prepared using a combination of solvent evaporation and mini-emulsion technology. These particles were then immobilized onto solid surfaces premodified with a thin layer of allylamine plasma polymer (AApp). The antibacterial efficacy of the PLLA-AgNPs nanoparticles was studied in vitro against both gram-positive (Staphylococcus epidermidis) and gram-negative (Escherichia coli) bacteria. The minimal inhibitory concentration values against Staphylococcus epidermidis and Escherichia coli were 0.610 and 1.156 μg · mL(-1), respectively. The capacity of the prepared coatings to prevent bacterial surface colonization was assessed in the presence of Staphylococcus epidermidis, which is a strong biofilm former that causes substantial problems with medical device associated infections. The level of inhibition of bacterial growth was 98%. The substrate independent nature and the high antibacterial efficacy of coatings presented in this study may offer new alternatives for antibacterial coatings for medical devices.
authors.affiliation: School of Engineering, University of South Australia, Mawson Lakes, SA 5095 Australia.
authors.forename: Shima
authors.initials: S
authors.lastname: Taheri
authors.forename: Grit
authors.initials: G
authors.lastname: Baier
authors.forename: Peter
authors.initials: P
authors.lastname: Majewski
authors.forename: Mary
authors.initials: M
authors.lastname: Barton
authors.forename: Renate
authors.initials: R
authors.lastname: Förch
authors.forename: Katharina
authors.initials: K
authors.lastname: Landfester
authors.forename: Krasimir
authors.initials: K
authors.lastname: Vasilev
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D004926:Escherichia coli / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D011091:Polyesters / Q000494:pharmacology*; D012834:Silver / Q000494:pharmacology*; D013212:Staphylococcus epidermidis / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D011091:Polyesters; D012834:Silver; C033616:poly(lactide)