title: On the role of surface composition and curvature on biointerface formation and colloidal stability of nanoparticles in a protein-rich model system.
abstract: The need for a better understanding of nanoparticle-protein interactions and the mechanisms governing the resulting colloidal stability has been emphasised in recent years. In the present contribution, the short and long term colloidal stability of silica nanoparticles (SNPs) and silica-poly(ethylene glycol) nanohybrids (Sil-PEG) have been scrutinised in a protein model system. Well-defined silica nanoparticles are rapidly covered by bovine serum albumin (BSA) and form small clusters after 20min while large agglomerates are detected after 10h depending on both particle size and nanoparticle-protein ratio. Oppositely, Sil-PEG hybrids present suppressive protein adsorption and enhanced short and long term colloidal stability in protein solution. No critical agglomeration was found for either system in the absence of protein, proving that instability found for SNPs must arise as a consequence of protein adsorption and not to high ionic environment. Analysis of the small angle X-ray scattering (SAXS) structure factor indicates a short-range attractive potential between particles in the silica-BSA system, which is in good agreement with a protein bridging agglomeration mechanism. The results presented here point out the importance of the nanoparticle surface properties on the ability to adsorb proteins and how the induced or depressed adsorption may potentially drive the resulting colloidal stability.
authors.affiliation: Federal Institute for Materials Research and Testing (BAM 5.1), Unter den Eichen 87, D-12205 Berlin, Germany. Guillermo.Orts-Gil@mpikg.mpg.de
authors.forename: Guillermo
authors.initials: G
authors.lastname: Orts-Gil
authors.forename: Kishore
authors.initials: K
authors.lastname: Natte
authors.forename: Raphael
authors.initials: R
authors.lastname: Thiermann
authors.forename: Matthias
authors.initials: M
authors.lastname: Girod
authors.forename: Steffi
authors.initials: S
authors.lastname: Rades
authors.forename: Henryk
authors.initials: H
authors.lastname: Kalbe
authors.forename: Andreas F
authors.initials: AF
authors.lastname: Thünemann
authors.forename: Michael
authors.initials: M
authors.lastname: Maskos
authors.forename: Werner
authors.initials: W
authors.lastname: Österle
mesh_terms: D000327:Adsorption; D000818:Animals; D002417:Cattle; D003102:Colloids; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry*; D053838:Scattering, Small Angle; D012710:Serum Albumin, Bovine / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: D003102:Colloids; D012710:Serum Albumin, Bovine; D011092:Polyethylene Glycols; D012822:Silicon Dioxide