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Luminophore-Surface-Engineering-Enabled Low-Triggering-Potential and Coreactant-Free Electrochemiluminescence for
Xuwen Gao1, Xiaoxuan Ren1, Yaojia Ai1
1School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.
Analytical Chemistry
|April 21, 2023
Summary
This study introduces a novel coreactant-free electrochemiluminescence (ECL) method using dual-stabilizer-capped CdTe nanocrystals (NCs). This approach simplifies bioassays and enables sensitive detection of proteins like ProGRP with improved performance.
Area of Science:
- Electrochemistry and Nanomaterials Science
- Biochemical Assays and Biosensing
Background:
- Coreactant-free electrochemiluminescence (ECL) offers advantages over traditional methods by eliminating exogenous coreactants, simplifying assay procedures, and enhancing commercial viability.
- Existing ECL bioassays can be complex due to the need for coreactants, limiting their widespread adoption and operational simplicity.
Purpose of the Study:
- To develop a coreactant-free ECL strategy using dual-stabilizer-capped cadmium telluride (CdTe) nanocrystals (NCs) with low triggering potential.
- To investigate the influence of protein conjugation and antibody size on the ECL properties of CdTe NCs.
- To establish a sensitive and selective ECL immunoassay for detecting specific protein biomarkers.
Main Methods:
- Synthesized dual-stabilizer-capped CdTe NCs using mercaptopropionic acid (MPA) and hexametaphosphate (HMP).
- Conjugated CdTe NCs with secondary antibodies (Ab2) of varying molecular weights.
- Developed a sandwich-type immunoassay format for protein detection.
- Investigated the electrosteric effect of protein conjugation on ECL triggering potential and performance.
Main Results:
- Achieved coreactant-free ECL from CdTe NCs at a low triggering potential of +0.21 V vs Ag/AgCl.
- Demonstrated that the ECL triggering potential is dependent on the molecular weight of the conjugated antibody, with lower molecular weights (<30 kDa) exhibiting ECL around +0.24 V.
- Successfully developed a coreactant-free ECL immunoassay for recombinant pro-gastrin releasing peptide (ProGRP) with a low limit of detection (0.05 pg/mL) and wide linear range (0.1–2000 pg/mL).
Conclusions:
- The proposed electrosterically involved strategy enables efficient coreactant-free ECL from CdTe NCs, significantly simplifying bioassay operations.
- Engineering the surface of CdTe NCs with proteins, considering their weight, enhances ECL tag performance in a protein-weight-involved electrosterical manner.
- This low-triggering-potential, coreactant-free ECL platform provides a promising avenue for sensitive and selective biomarker detection in clinical diagnostics.
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