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A novel bimetallic MXene derivative QD-based ECL sensor for miRNA-27a-3p detection
Mingxuan Li1, Zhenrun Li1, Peilin Wang1
1Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China.
Biosensors & Bioelectronics
|March 16, 2023
Summary
A new electrochemiluminescence (ECL) biosensor uses molybdenum-titanium carbide quantum dots (Mo₂TiC₂ QDs) and tin disulfide nanosheets to detect gastric cancer marker miRNA-27a-3p. This sensitive biosensor shows great potential for early gastric cancer diagnosis.
Area of Science:
- Biomedical Engineering
- Materials Science
- Analytical Chemistry
Background:
- Gastric cancer diagnosis relies on sensitive and specific biomarkers.
- MicroRNA-27a-3p is a potential biomarker for gastric cancer.
- Existing detection methods often lack sensitivity or require complex procedures.
Purpose of the Study:
- To develop a novel and highly sensitive electrochemiluminescence (ECL) biosensor for detecting miRNA-27a-3p.
- To utilize bimetallic MXene derivative quantum dots (Mo₂TiC₂ QDs) and tin disulfide (SnS₂) nanosheets for enhanced sensing performance.
- To explore the synergistic effects of Mo₂TiC₂ QDs and a lipid bilayer-modified SnS₂ interface for improved stability and sensitivity.
Main Methods:
- Fabrication of a novel ECL biosensor incorporating Mo₂TiC₂ QDs and SnS₂ nanosheets coated with a lipid bilayer.
- Investigating the properties of Mo₂TiC₂ QDs, including their luminescence enhancement and stability.
- Characterizing the SnS₂ nanosheets/lipid bilayer interface for its role in signal amplification and stability.
- Evaluating the biosensor's performance for miRNA-27a-3p detection, including sensitivity, linear range, and reproducibility.
Main Results:
- The Mo₂TiC₂ QDs exhibited superior luminous intensity and stability due to inter-band excitation and suppressed oxidation.
- The SnS₂ nanosheets/lipid bilayer interface enhanced ECL intensity and improved lipid bilayer stability.
- The developed biosensor demonstrated high sensitivity and good reproducibility for miRNA-27a-3p detection.
- A wide linear range (1 fM to 10 nM) and a low detection limit (1 fM) were achieved.
Conclusions:
- The novel ECL biosensor based on Mo₂TiC₂ QDs and SnS₂ nanosheets/lipid bilayer offers a highly sensitive and stable platform for miRNA-27a-3p detection.
- The synergistic combination of Mo₂TiC₂ QDs and the functionalized SnS₂ interface significantly enhances biosensing performance.
- This advanced biosensing system holds significant promise for early clinical diagnosis of gastric cancer.
