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Rapid Nanoprobe Signal Enhancement by In Situ Gold Nanoparticle Synthesis
Published on: March 7, 2018
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Self-assembled multiprotein nanostructures with enhanced stability and signal amplification capability for sensitive
Hongxia Li1, Xu Yan2, Deshuai Kong2
1State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, PR China; Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun, 130062, PR China.
Biosensors & Bioelectronics
|March 4, 2022
Summary
A novel urease-antibody-CaHPO4 hybrid nanoflower (UAhNF) was developed for enhanced immunoassay sensitivity. This biosensor significantly improves detection limits for targets like imidacloprid, offering a versatile tool for bioassays.
Area of Science:
- Biomaterials Science
- Analytical Chemistry
- Immunotechnology
Background:
- Improving immunoassay sensitivity is crucial for critical applications but remains challenging.
- Existing methods often lack the required sensitivity for trace-level detection.
- Novel probes are needed to overcome limitations in current biosensing technologies.
Purpose of the Study:
- To design and synthesize a novel immunoprobe for enhanced sensing sensitivity.
- To develop a competitive-type fluorogenic immunoassay using the novel immunoprobe.
- To demonstrate the utility of the developed immunosensor for detecting imidacloprid.
Main Methods:
- Fabrication of urease-antibody-CaHPO4 hybrid nanoflower (UAhNF) via biomineralization.
- Construction of a competitive-type fluorogenic immunoassay using UAhNF.
- Integration of urease-initiated in-situ etching of copper nanoparticles for signal amplification.
- Utilizing imidacloprid as a model target for assay validation.
Main Results:
- UAhNF demonstrated enhanced stability of urease and antibody recognition capabilities.
- The developed immunosensor achieved a 50% inhibition concentration (IC50) of 0.72 ng/mL for imidacloprid.
- This represents a 30-fold improvement in sensitivity compared to conventional enzyme-linked immunosorbent assay (ELISA).
Conclusions:
- The UAhNF-based immunosensor offers significantly improved detection sensitivity for bioassays.
- The biomineralization approach provides a versatile platform for creating functional immunoprobes.
- This technology holds promise for various bioassay applications requiring high sensitivity.
