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A sensitive and innovative detection method for rapid C-reactive proteins analysis based on a micro-fluxgate sensor
Lei Guo1, Zhen Yang2, Shaotao Zhi1
1Key Laboratory for Thin Film and Microfahrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai JiaoTong University, Shanghai, China.
Plos One
|March 31, 2018
Summary
A novel biosensor using a micro-MEMS-fluxgate sensor and immunomagnetic beads enables rapid C-reactive protein (CRP) analysis. This sensitive system achieves a low detection limit, offering potential for quick point-of-care diagnostics.
Area of Science:
- Biosensor technology
- Micro-electro-mechanical systems (MEMS)
- Immunomagnetic assays
Background:
- C-reactive protein (CRP) is a key biomarker for inflammation.
- Existing CRP detection methods can be time-consuming or lack sensitivity.
- Need for rapid, sensitive, and portable diagnostic tools.
Purpose of the Study:
- To develop a sensitive and rapid biosensor system for C-reactive protein (CRP) detection.
- To utilize micro-MEMS-fluxgate sensor technology combined with immunomagnetic beads.
- To achieve a low detection limit and fast response time for CRP analysis.
Main Methods:
- Fabrication of a micro-MEMS-fluxgate sensor with a Fe-based amorphous ribbon core.
- Utilized antibody-conjugated immunomagnetic microbeads for CRP labeling.
- Employed sandwich assays on Au film substrates for signal amplification.
- Detected CRP via the stray field of labeled magnetic beads using the fluxgate sensor.
Main Results:
- Achieved a highly sensitive detection limit of 0.002 μg/mL for CRP.
- Demonstrated a wide linearity range from 0.002 μg/mL to 10 μg/mL.
- Exhibited excellent sensitivity, stability, reproducibility, and selectivity.
- Sensor response time was under 5 seconds, with total assay time under 30 minutes.
Conclusions:
- The developed micro-MEMS-fluxgate biosensor offers a sensitive and rapid method for CRP detection.
- The system's miniaturization, stability, and speed make it suitable for point-of-care applications.
- This innovative biosensor shows significant potential for clinical diagnostics and inflammatory marker monitoring.
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