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ENSAM: Europium Nanoparticles for Signal Enhancement of Antibody Microarrays on Nanoporous Silicon.

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Author

Summary, in English

To improve the sensitivity of antibody microarray assays, we developed ENSAM ( Europium Nanoparticles for Signal enhancement of Antibody Microarrays). ENSAM is based on two nanomaterials. The first is polystyrene nanoparticles incorporated with europium chelate (beta-diketone) and coated with streptavidin. The multiple fluorophores incorporated into each nanoparticle should increase signal obtained from a single binding event. The second nanomaterial is array surfaces of nanoporous silicon, which creates high capacity for antibody adsorption. Two antibody microarray assays were compared: ENSAM and use of streptavidin labeled with a nine-dentate europium chelate. Analyzing biotinylated prostate-specific antigen (PSA) spiked into human female serum, ENSAM yielded a 10-fold signal enhancement compared to the streptavidin-europium chelate. Similarly, we observed around 1 order of magnitude greater sensitivity for the ENSAM assay (limit of detection </= 0.14 ng/mL, dynamic range > 10 (5)) compared to the streptavidin-europium chelate assay (limit of detection </= 0.7 ng/mL, dynamic range > 10 (4)). Analysis of a titration series showed strong linearity of ENSAM ( R (2) = 0.99 by linear regression). This work demonstrates the novel utility of nanoparticles with time-resolved fluorescence for signal enhancement of antibody microarrays, requiring as low as 100-200 zmol biotinylated PSA per microarray spot. In addition, proof of principle was shown for analyzing PSA in plasma obtained from patients undergoing clinical PSA-testing.

Publishing year

2008

Language

English

Pages

1308-1314

Publication/Series

Journal of Proteome Research

Volume

7

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Nano Technology

Status

Published

Research group

  • Clinical Chemistry, Malmö
  • Urological cancer, Malmö

ISBN/ISSN/Other

  • ISSN: 1535-3893