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Yansheng Li1, Yanli Ma2, Xiangyu Jiao1

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This study introduces a novel DNA hydrogel method for sensitive cocaine detection. The technique utilizes capillary action and thermal reversibility for rapid, instrument-free analysis with a low detection limit.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Biotechnology

Background:

  • Intelligent hydrogels show promise in analytical science but face application limitations.
  • DNA hydrogels offer unique properties for sensor development.

Purpose of the Study:

  • To develop a sensitive and selective method for detecting specific targets using DNA hydrogels.
  • To overcome limitations of current intelligent hydrogel applications in analytical science.

Main Methods:

  • Preparation of a DNA hydrogel film within a capillary tube based on thermal reversibility.
  • Utilizing capillary action and changes in hydrogel permeability upon target binding.
  • Quantifying target presence by measuring the flow-through time of a solution in the capillary tube.

Main Results:

  • Demonstrated sensitive detection of cocaine using ultra-trace amounts of DNA hydrogel (0.01 μL).
  • Achieved a low detection limit of 1.17 nM for cocaine.
  • Exhibited good selectivity for cocaine detection.

Conclusions:

  • The proposed method offers a simple, instrument-free approach for sensitive analyte detection.
  • DNA hydrogels can be effectively utilized in capillary-based sensing systems.
  • This technique holds potential for rapid and on-site detection of specific targets.