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Immobilizing affinity proteins to nitrocellulose: a toolbox for paper-based assay developers.

Carly A Holstein1, Aaron Chevalier2,3, Steven Bennett2

  • 1Department of Bioengineering, University of Washington, 3720 15th Ave NE, Seattle, WA, 98105, USA. cholst@uw.edu.

Analytical and Bioanalytical Chemistry
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Researchers developed novel methods to immobilize affinity proteins onto nitrocellulose membranes for improved paper-based diagnostics. These techniques enhance detection capabilities for influenza hemagglutinin assays, advancing diagnostic tools.

Keywords:
NitrocellulosePaper-based assaysProtein engineeringProtein immobilization

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Area of Science:

  • Biotechnology
  • Materials Science
  • Analytical Chemistry

Background:

  • Current paper-based diagnostics require improved methods for immobilizing affinity reagents, particularly non-IgG capture molecules, onto porous substrates.
  • Nitrocellulose membranes are common substrates for paper-based diagnostics, but efficient and versatile immobilization strategies are needed.

Purpose of the Study:

  • To develop and characterize novel methods for immobilizing protein-based affinity reagents onto nitrocellulose membranes.
  • To demonstrate the utility of these methods for influenza hemagglutinin detection and compare their performance to traditional methods.

Main Methods:

  • Developed three novel immobilization techniques: covalent attachment via thiolation, streptavidin-mediated anchoring, and direct fusion with a nitrocellulose-binding protein.
  • Utilized recombinant "flu binders" targeting influenza hemagglutinin for method demonstration.
  • Characterized direct adsorption as a comparative method.

Main Results:

  • Successfully immobilized recombinant affinity proteins using the three novel methods.
  • Demonstrated improved performance in an influenza hemagglutinin assay compared to traditional antibody-based capture systems.
  • Showcased the customizability of recombinant affinity proteins for immobilization strategies.

Conclusions:

  • The developed immobilization methods offer enhanced capabilities for paper-based diagnostics.
  • These novel techniques advance the toolkit for creating next-generation diagnostic assays.
  • The findings support the development of more sensitive and specific paper-based diagnostic platforms.