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Related Experiment Video

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Highly Sensitive and Rapid Fluorescence Detection with a Portable FRET Analyzer
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Fluorescence hydrogel array based on interfacial cation exchange amplification for highly sensitive microRNA

Lina Wu1, Yingfei Wang1, Rong He1

  • 1State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China.

Analytica Chimica Acta
|August 15, 2019
PubMed
Summary
This summary is machine-generated.

This study presents a novel polyethylene glycol (PEG) hydrogel array for highly sensitive microRNA detection, overcoming photo-quenching issues. The developed fluorescence sensing platform offers improved sensitivity for bioanalysis and potential clinical disease diagnosis.

Keywords:
Cation exchange fluorescence amplificationHybridization chain reactionMicroRNA detectionPEG hydrogel array

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Materials Science

Background:

  • Fluorescence sensing arrays face sensitivity limitations due to photo-quenching at high fluorophore densities.
  • MicroRNA detection is crucial for bioanalysis and disease diagnosis.
  • Existing methods require improvement in sensitivity and simplicity.

Purpose of the Study:

  • To develop a highly sensitive microRNA detection platform overcoming photo-quenching.
  • To utilize a polyethylene glycol (PEG) hydrogel array for enhanced fluorescence sensing.
  • To establish a universal platform for sensitive bioanalysis and non-invasive disease diagnosis.

Main Methods:

  • Fabrication of a carboxylate PEG hydrogel array via photopolymerization.
  • Integration of DNA hybridization chain reaction (HCR) for signal amplification.
  • Application of interfacial cation exchange with Ag+ and Rhod-5N for fluorescence enhancement.
  • Utilizing biotinylated CdS QDs and streptavidin for signal amplification.

Main Results:

  • Achieved a linear detection range of 1 µM to 500 pM for miRNA-21 with a detection limit of 0.835 µM.
  • Demonstrated direct quantification of miRNA-21 from crude cancer cell lysates with a limit down to 10 equivalent cells.
  • Obtained comparable results to RT-PCR for circulating miRNA-21 in clinical serum samples.

Conclusions:

  • The PEG hydrogel array effectively eliminates fluorescence quenching, enhancing sensitivity.
  • The developed platform simplifies experimental processes and offers a universal approach for fluorescence sensing.
  • This technology holds promise for sensitive bioanalysis and non-invasive clinical disease diagnosis.