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The adsorption of bovine serum albumin (BSA) on two types of silica nanoparticles (NPs), one pyrolytic (P-SiO2; namely, AOX50 by Evonik) and the other colloidal (lab-made by using inverse micelles microemulsion, M-SiO2), is studied. Both materials are characterized in terms of size of primary particles (by transmission electron microscopy); amounts (by thermogravimetry) and distribution of silanols (infrared spectroscopy in controlled atmosphere, augmented by H/D isotopic exchange and reaction with VOCl3, to distinguish silanols actually located at the surface of nanoparticles); water contact angle; ζ-potential; and dispersion state in water, PBS buffer, and BSA solutions in PBS (by dynamic light scattering, DLS). Proteins are found to act as dispersing agent toward the large aggregates formed by both types of NPs in PBS buffer, although monodispersion was not attained in the conditions investigated. The problem of the determination of the silica surface actually available in NP agglomerates for protein a...

the journal of physical chemistry c

Effect of Silica Surface Properties on the Formation of Multilayer or Submonolayer Protein Hard Corona: Albumin Adsorption on Pyrolytic and Colloidal SiO<sub>2</sub> Nanoparticles

Effect of Silica Surface Properties on the Formation of Multilayer or Submonolayer Protein Hard Corona: Albumin Adsorption on Pyrolytic and Colloidal SiO2 Nanoparticles

Effect of Silica Surface Properties on the Formation of Multilayer or Submonolayer Protein Hard Corona: Albumin Adsorption on Pyrolytic and Colloidal SiO₂ Nanoparticles