Measurement of antibody binding to protein immobilized on gold nanoparticles by localized surface plasmon spectroscopy.
Antibody binding to bovine serum albumin (BSA) and human serum albumin (HSA) immobilized onto gold nanoparticles was studied by means of localized surface plasmon resonance (LSPR) spectroscopy. Amine-modified glass was prepared by self-assembly of amine-terminated silane on substrate, and gold (Au) nanoparticles were deposited on the amine-modified glass substrate. Au nanoparticles deposited on the glass surface were functionalized by BSA and HSA. BSA immobilization was confirmed by LSPR spectroscopy in conjunction with surface-enhanced Raman scattering spectroscopy. Then, LSPR response attributable to the binding of anti-BSA and anti-HSA to BSA- and HSA-functionalized Au nanoparticles, respectively, was examined. Anti-HSA at levels larger than approximately 10 nM could be detected by HSA-immobilized chips with LSPR optical response, which was saturated at concentrations greater than approximately 650 nM of anti-HSA.
Fujiwara
Kazuhiko
K
Department of Materials Process & Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University, Tegata Gakuen-cho, Akita, 010-8502, Japan. kfuji@ipc.akita-u.ac.jp
Watarai
Hitoshi
H
Itoh
Hideaki
H
Nakahama
Erika
E
Ogawa
Nobuaki
N
D000818:Animals; D000906:Antibodies / Q000737:chemistry / Q000378:metabolism*; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D002417:Cattle; D005898:Glass / Q000737:chemistry; D006046:Gold / Q000737:chemistry* / Q000378:metabolism; D006801:Humans; D036103:Nanotechnology / Q000379:methods*; D011485:Protein Binding; D012709:Serum Albumin / Q000737:chemistry* / Q000378:metabolism; D012710:Serum Albumin, Bovine / Q000737:chemistry / Q000378:metabolism; D020349:Surface Plasmon Resonance; D013499:Surface Properties
D000906:Antibodies; D012709:Serum Albumin; D012710:Serum Albumin, Bovine; D006046:Gold