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Analytical and Bioanalytical Chemistry

, Volume 404, Issue 10, pp 2869–2875 | Cite as

Biofunctionalized gold nanoparticles for SPR-biosensor-based detection of CEA in blood plasma

  • Tomáš Špringer
  • Jiří HomolaEmail author
Original Paper

Abstract

We report on the use of new biofunctionalized gold nanoparticles (bio-AuNPs) that enable a surface plasmon resonance (SPR) biosensor to detect low levels of carcinoembryonic antigen (CEA) in human blood plasma. Bio-AuNPs consist of gold nanoparticles functionalized both with (1) streptavidin, to provide high affinity for the biotinylated secondary antibody used in the second step of the CEA sandwich assay, and with (2) bovine serum albumin, to minimize the nonspecific interaction of the bio-AuNPs with complex samples (blood plasma). We demonstrate that this approach makes it possible for the SPR biosensor to detect CEA in blood plasma at concentrations as low as 0.1 ng/mL, well below normal physiological levels (approximately nanograms per milliliter). Moreover, the limit of detection achieved using this approach is better by a factor of more than 1,000 than limits of detection reported so far for CEA in blood plasma using SPR biosensors.

Keywords

Surface plasmon resonance Carcinoembryonic antigen Biosensor Nanoparticles 

Notes

Acknowledgments

We thank Nicholas Scott Lynn for valuable comments and discussions. This research was supported by Praemium Academiae of the Academy of Sciences of the Czech Republic, the Czech Science Foundation (contract P205/12/G118), and the Ministry of Education, Youth and Sports (contracts OC09058 and LH11102).

Supplementary material

216_2012_6308_MOESM1_ESM.pdf (604 kb)
ESM 1 (PDF 603 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Institute of Photonics and Electronics AS CR, v.v.i.PragueCzech Republic

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