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A DNA-Based Assay for Digoxin Detection.

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A new homogeneous assay detects digoxin in plasma using DNA strand displacement. This rapid method offers a potential alternative for therapeutic drug monitoring of small-molecule drugs.

Keywords:
DNA nanotechnologyDNA strand displacement competition reactiondetection in plasmadetection of small moleculesdigoxin detectionhomogeneous assay

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Molecular Diagnostics

Background:

  • Quantifying small-molecule drugs in blood typically relies on liquid chromatography-mass spectrometry.
  • Immunoassays for small-molecule drug detection in blood are limited.
  • Therapeutic drug monitoring (TDM) is crucial for optimizing patient treatment with specific drugs.

Purpose of the Study:

  • To develop a novel homogeneous assay for detecting small-molecule drugs in plasma.
  • To demonstrate the assay's capability using digoxin as a model compound.
  • To provide a potential alternative to existing methods for TDM.

Main Methods:

  • The assay utilizes a DNA strand displacement competition reaction.
  • Detection is based on a shift in the reaction equilibrium upon antibody binding.
  • The assay is homogeneous, meaning no separation steps are required.

Main Results:

  • The assay successfully detected digoxin spiked into plasma samples.
  • Detection was achieved within 30 minutes for concentrations above 10 nM.
  • The assay demonstrated a measurable equilibrium shift upon anti-digoxigenin antibody binding.

Conclusions:

  • A novel homogeneous assay based on DNA strand displacement was developed for small-molecule drug detection.
  • This assay shows promise as a rapid and effective method for therapeutic drug monitoring.
  • The assay offers a potential alternative to current gold-standard methods like LC-MS.