Abstract
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 ∼10 nM could be detected by HSA-immobilized chips with LSPR optical response, which was saturated at concentrations greater than ∼650 nM of anti-HSA.
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Acknowledgements
This work was supported by grants to K.F. from Foundation Advanced Technology Institute, Izumi Science and Technology (H16-J-56), and “Research for Promoting Technological Seeds” of Japan Science and Technology Agency.
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Fujiwara, K., Watarai, H., Itoh, H. et al. Measurement of antibody binding to protein immobilized on gold nanoparticles by localized surface plasmon spectroscopy. Anal Bioanal Chem 386, 639–644 (2006). https://doi.org/10.1007/s00216-006-0559-2
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DOI: https://doi.org/10.1007/s00216-006-0559-2