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Labeling DNA Probes03:31

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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules
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Oxidization-driven polyamine probe boosts biosensor selectivity via a proton sponge effect regulation strategy.

Jingxin Yu1, Jiaojiao Zheng1, Xinyu Fan1

  • 1State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, China.

Biosensors & Bioelectronics
|February 22, 2026
PubMed
Summary
This summary is machine-generated.

We developed a novel biosensor for selective Levodopa (DOPA) detection, overcoming interference issues. This probe enables sensitive DOPA measurement in biological samples and monitoring of related enzyme activity.

Keywords:
Electrostatic attractionLevodopaPolyamine oxidationProton sponge effectSelf-polymerization

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Neuroscience

Background:

  • Selective Levodopa (DOPA) recognition is crucial for understanding neurological functions and brain diseases.
  • Interference from DOPA analogues complicates accurate detection.
  • Existing methods struggle with selectivity and sensitivity.

Purpose of the Study:

  • To develop a highly selective biosensor for Levodopa (DOPA) detection.
  • To investigate the mechanism of enhanced selectivity using a proton sponge effect-regulated probe.
  • To enable real-time monitoring of DOPA-related biological processes.

Main Methods:

  • Development of an oxidized hyperbranched polyethyleneimine (hPEIox) probe.
  • Utilizing the proton sponge effect for regulated reactivity.
  • Employing fluorescence spectroscopy for DOPA detection.

Main Results:

  • Achieved selective DOPA recognition with a low limit of detection (1.3 nM).
  • Demonstrated probe efficacy in complex biological matrices like urine and cerebrospinal fluid.
  • Successfully monitored DOPA generation/consumption kinetics and DOPA decarboxylase activity.

Conclusions:

  • The hPEIox probe offers a robust platform for selective DOPA detection.
  • The modified proton sponge effect enhances biosensor selectivity and sensitivity.
  • This tool has potential applications in diagnostics and biochemical research.