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Biofunctionalization of Magnetic Nanomaterials
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Optimizing Nanoplasmonic Biosensor Sensitivity with Orientated Single Domain Antibodies.

Marc P Raphael1, Joseph A Christodoulides1, Jeff M Byers1

  • 1Bioelectronics and Sensing, Code 6363, Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375 USA.

Plasmonics (Norwell, Mass.)
|November 24, 2015
PubMed
Summary

Orientated single domain antibodies (sdAbs) enhance nanoscale biosensing sensitivity. These stable, easily produced sdAbs offer a promising alternative for optimizing localized surface plasmon resonance (LSPR) imaging applications.

Keywords:
Bio-threatLSPROrientationRicinSPRSingle domain antibodies

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Biosensing

Background:

  • Localized surface plasmon resonance (LSPR) spectroscopy and imaging are advanced label-free biosensor technologies.
  • Current LSPR applications face limitations due to ligand size and orientation constraints.
  • Optimizing ligand presentation is crucial for enhancing nanoscale detection sensitivity.

Purpose of the Study:

  • To investigate the potential of orientated single domain antibodies (sdAbs) to improve nanoplasmonic biosensor sensitivity.
  • To compare the performance of anti-ricin sdAb constructs with a model biotin-neutravidin system.
  • To establish sdAbs as a viable tool for advanced LSPR applications.

Main Methods:

  • Utilized localized surface plasmon resonance (LSPR) imaging.
  • Employed electrostatically orientated single domain antibodies (sdAbs) as ligands.
  • Compared sdAb performance against a standard biotin-neutravidin model system for sensitivity analysis.

Main Results:

  • Electrostatically orientated sdAbs demonstrated ricin detection sensitivity comparable to biotinylated LSPR biosensors.
  • The study successfully compared three anti-ricin sdAb constructs for nanoplasmonic optimization.
  • sdAbs proved effective in overcoming limitations associated with small, rigidly oriented ligands.

Conclusions:

  • Orientated sdAbs significantly enhance nanoplasmonic sensitivity in LSPR biosensing.
  • sdAbs are highly stable and readily produced, making them suitable for widespread nanoplasmonic use.
  • The findings support the increased adoption of sdAbs in LSPR imaging and other nanoplasmonic applications.