Abstract
Lanthanide oxide nanoparticles are promising luminescent probes in bioanalysis, because of their unique spectral properties, photostability, and low-cost synthesis. We report for the first time the application of europium-doped gadolinium oxide (Eu:Gd2O3) nanoparticles to the optical imaging of antibody micropatterns. The nanoparticles were synthesized by spray pyrolysis and coated with antibody (IgG) molecules by physical adsorption. Our experiments showed that the Eu:Gd2O3 is a good biocompatible solid support for antibody immobilization. The antibodies (anti-rabbit IgG) immobilized on the nanoparticles had excellent biological activity in the specific recognition reaction with rabbit IgG patterned in line strips (10 μm×10 μm) on a glass substrate by use of a micro-contact printing technique. The specific immunoreaction was confirmed by two independent microscopic techniques—fluorescence and scanning electron microscopy (SEM). Both microscopic images revealed that the nanoparticles were organized into designated structures as defined by the microcontact printing process with negligible non-specific binding. The nanoparticles can be used as fluorescent markers in a variety of immunosensing applications in a microscale format.
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Acknowledgements
The authors wish to acknowledge the support of the National Science Foundation, grant DBI-0102662, the Superfund Basic Research Program with Grant 5P42ES04699 from the National Institute of Environmental Health Sciences NIH, and the support of the Cooperative State Research, Education, and Extension Service, US Department of Agriculture, under Award No. 05-35603-16280.
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Nichkova, M., Dosev, D., Perron, R. et al. Eu3+-doped Gd2O3 nanoparticles as reporters for optical detection and visualization of antibodies patterned by microcontact printing. Anal Bioanal Chem 384, 631–637 (2006). https://doi.org/10.1007/s00216-005-0246-8
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DOI: https://doi.org/10.1007/s00216-005-0246-8