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Use of an Influenza Antigen Microarray to Measure the Breadth of Serum Antibodies Across Virus Subtypes
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Quantitative label-free screening for antibodies using scattering biophotonic microarray imaging.

Rouslan V Olkhov1, Andrew M Shaw

  • 1School of Biosciences, University of Exeter, Exeter EX4 4QD, UK.

Analytical Biochemistry
|August 15, 2009
PubMed
Summary

This study introduces a gold nanoparticle biophotonic array for detecting antibody concentrations. The novel assay achieves high sensitivity and accuracy for antigen-antibody detection in solution.

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Area of Science:

  • Biophotonics
  • Nanotechnology
  • Immunochemistry

Background:

  • Antibody concentration determination is crucial in diagnostics and research.
  • Existing methods may lack sensitivity or require labels.
  • Biophotonic arrays offer potential for label-free detection.

Purpose of the Study:

  • To develop and validate a biophotonic array for label-free antibody quantification.
  • To assess the sensitivity and accuracy of the developed assay.
  • To determine antibody-antigen kinetic parameters.

Main Methods:

  • Functionalization of gold nanoparticles with specific antigen proteins.
  • Construction of a multi-spot biophotonic array.
  • Kinetic analysis of antibody-antigen binding and dissociation.
  • Label-free quantification using kinetic data.

Main Results:

  • Successful construction of a biophotonic array with four different antigens.
  • Determination of antibody-antigen association and dissociation rate constants.
  • Achieved assay sensitivity of 250 ng/mL with 15% accuracy.
  • Demonstrated label-free antibody concentration determination in 8 minutes.

Conclusions:

  • The gold nanoparticle biophotonic array provides a sensitive and accurate method for antibody quantification.
  • The label-free kinetic analysis enables rapid determination of antibody concentrations.
  • This technology holds promise for various diagnostic and research applications.