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A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells
Published on: October 15, 2013
Rare cell chemiluminescence detection based on aptamer-specific capture in microfluidic channels
1Beijing Key Laboratory of Microanalysis and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, PR China.
Biosensors & Bioelectronics
|August 23, 2011
Summary
This study presents a novel aptamer-based microfluidic chip for rare cell detection using chemiluminescence (CL) analysis. The method achieves high capture efficiency and purity, offering a rapid and cost-effective tool for early cancer diagnosis.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Nanotechnology
Background:
- Early cancer diagnosis relies on detecting rare cells in complex biological samples.
- Existing methods for rare cell capture and detection face challenges in sensitivity, specificity, and speed.
- Microfluidic devices offer a promising platform for cell analysis due to their small sample volumes and high throughput potential.
Purpose of the Study:
- To develop a sensitive and specific aptamer-based microfluidic system for rare cell isolation and detection.
- To integrate chemiluminescence (CL) analysis for rapid and quantitative detection of captured rare cells.
- To evaluate the system's performance using artificial and real biological samples for potential application in early cancer diagnosis.
Main Methods:
- Immobilization of specific aptamers onto microfluidic channels for selective rare cell capture.
- Utilizing gold nanoparticles (Au NPs) functionalized with aptamers for cell binding and subsequent chemiluminescence (CL) signal generation.
- Development of a "sandwich" assay incorporating aptamer capture and CL detection on a microfluidic chip.
- Quantitative analysis of captured cells by correlating CL intensity with cell numbers.
Main Results:
- Achieved high capture efficiency (>70%) and purity (>97%) for target rare cells within a mixture (0.5%-10%).
- Demonstrated a low limit of detection (30 cells in 3 μL) with good linearity (log/log calibration curve) between CL intensity and cell number.
- Validated the method's practicality using spiked whole blood samples, showing promising results.
Conclusions:
- The developed aptamer-based microfluidic chip coupled with CL detection provides a sensitive, specific, and rapid method for rare cell analysis.
- This approach holds significant potential for the early diagnosis of cancers and other diseases.
- The cost-effectiveness and speed of CL detection make it suitable for widespread clinical application.
