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Asymmetric Heterodimer-Regulated Surface Plasmon Coupling ECL Polarization Strategy for MiRNA-182 Detection
Zihui Liang1, Xiaoyi Yan1, Junyi Zhao2,3
1Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun 130012, China.
Analytical Chemistry
|June 23, 2023
Summary
A novel plasmonic heterodimer controls light emission for a new biosensing system. This system detects miRNA-182 in breast cancer, offering a promising diagnostic tool.
Area of Science:
- Plasmonics and Nanotechnology
- Biosensing and Diagnostics
- Electrochemistry and Luminescence
Background:
- Surface Plasmon Coupling Electrogenerated Chemiluminescence (SPC-ECL) offers potential for sensitive detection.
- Controlling light polarization in ECL systems is crucial for advanced sensing applications.
- Plasmonic nanostructures can enhance light-matter interactions for improved sensing.
Purpose of the Study:
- To design a novel plasmonic heterodimer for regulating SPC-ECL polarization.
- To develop a biosensor for detecting miRNA-182 in triple-negative breast cancer (TNBC).
- To explore the relationship between plasmonic heterodimers and ECL polarization for new sensing platforms.
Main Methods:
- Fabrication of a heterodimer nanostructure using Au-Ag core-shell nanocubes (Au@Ag NC) and Au nanospheres (Au NS).
- Assembly of nanostructures via thiol-DNA and biotin-streptavidin linkages.
- Utilizing the synergy of surface plasmon coupling (SPC) and lightning rod effects for field enhancement and polarization control.
Main Results:
- The designed heterodimer successfully modulated ECL intensity and emission polarization angle.
- The system converted isotropic ECL signals from zinc-doped nitrogen dots (Zn-N dots) into directional emission.
- The SPC-ECL biosensor demonstrated successful detection of miRNA-182 in TNBC tissues.
Conclusions:
- Controllable plasmonic heterodimers can effectively regulate SPC-ECL polarization.
- This approach provides a new pathway for developing advanced ECL sensing platforms.
- The developed biosensor shows potential for sensitive and specific detection of cancer biomarkers.
