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Related Experiment Video

Updated: Jul 17, 2026

Detection of Exosomal Biomarker by Electric Field-induced Release and Measurement EFIRM
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A label-free colorimetric biosensor utilizing natural material for highly sensitive exosome detection.

Yibin Wu1, Zhaojie Wu1, Wan Xu1

  • 1Department of Biomaterials, The Higher Educational Key Laboratory for Biomedical Engineering of Fujian Province, Research Center of Biomedical Engineering of Xiamen, College of Materials, Xiamen University, Xiamen, China.

Talanta
|May 3, 2024
PubMed
Summary

This study introduces a novel colorimetric biosensor for detecting exosomes, crucial biomarkers for early cancer diagnosis. The sporopollenin-gold nanoparticle system offers a sensitive, selective, and stable platform for exosome detection in clinical settings.

Keywords:
BiosensorExosomesSporopollenin

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Exosomes are key mediators of intercellular communication and serve as noninvasive biomarkers for early cancer detection.
  • Colorimetric biosensors offer a cost-effective, simple, and rapid method for detecting biological analytes.
  • Developing sensitive and selective detection methods for exosomes is crucial for advancing cancer diagnostics.

Purpose of the Study:

  • To develop a label-free colorimetric biosensor for sensitive and selective exosome detection.
  • To utilize sporopollenin microcapsules and gold nanoparticles as a substrate for the biosensor.
  • To evaluate the biosensor's performance, including sensitivity, selectivity, and stability for potential clinical applications.

Main Methods:

  • Sporopollenin microcapsules (SP) were used as a substrate for gold nanoparticle (AuNP) immobilization, forming an SP-Au complex.
  • The SP-Au complex was modified with CD63 aptamers for specific exosome capture.
  • A colorimetric assay was developed based on the catalytic activity of the SP-Au complex on TMB, which is inhibited by exosome binding.

Main Results:

  • The developed biosensor demonstrated high sensitivity with a detection limit of 10 particles/μL and a wide linear range (10 - 108 particles/μL).
  • The biosensor showed high selectivity for exosome detection.
  • The SP-Au biosensor exhibited excellent stability against serum protein adsorption and catalytic stability in harsh environments.

Conclusions:

  • The novel sporopollenin-gold nanoparticle-based aptasensor provides a highly sensitive and selective platform for label-free exosome detection.
  • This colorimetric biosensor demonstrates significant potential for noninvasive early cancer diagnosis due to its robustness and suitability for clinical settings.