title: Sensing of protein adsorption with a porous bulk composite comprising silver nanoparticles deposited on hydroxyapatite.
abstract: Porous bulk composites were produced by depositing silver nanoparticles of diameter 11.0 +/- 3.2 nm on hydroxyapatite of micrometer sizes. Adsorption of bovine serum albumin (BSA) and lysozyme (LSZ) on the composite material was observed in 2 and 10 mol m(-3) phosphate buffer solutions. More BSA than LSZ was adsorbed in 2 mol m(-3) phosphate buffer and this was attributed to a larger a-face surface area present in the plate- and rod-shaped hydroxyapatite compared with the c-face surface area. Peak shifts in localized surface plasmon resonance (LSPR) spectra were clearly related to adsorbed amounts of BSA and LSZ after exposure of the porous bulk composites to protein solutions. The sensing capability of the porous bulk composite results from changes in the dielectric constant of the surface fluid surrounding the silver nanoparticles. Adsorption/desorption cycles of BSA were applied to the porous bulk composite, confirming the reversibility of the sensing capability.
authors.affiliation: Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, Japan. ohtsuki@apchem.nagoya-u.ac.jp
authors.forename: Chikara
authors.initials: C
authors.lastname: Ohtsuki
authors.forename: Yuji
authors.initials: Y
authors.lastname: Ichikawa
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Shibata
authors.forename: Giichiro
authors.initials: G
authors.lastname: Kawachi
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Torimoto
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Ogata
mesh_terms: D000327:Adsorption; D000818:Animals; D015374:Biosensing Techniques / Q000295:instrumentation*; D002417:Cattle; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D017886:Durapatite / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008954:Models, Biological; D009113:Muramidase / Q000378:metabolism / Q000493:pharmacokinetics; D053761:Nanocomposites / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D011485:Protein Binding; D011506:Proteins / Q000378:metabolism / Q000493:pharmacokinetics*; D012710:Serum Albumin, Bovine / Q000378:metabolism / Q000493:pharmacokinetics; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance; D013499:Surface Properties
chemical_list: D020099:Coated Materials, Biocompatible; D011506:Proteins; D012710:Serum Albumin, Bovine; D012834:Silver; D017886:Durapatite; D009113:Muramidase