Related Experiment Video
Updated: Apr 27, 2026
14:12
Amplification of Escherichia coli in a Continuous-Flow-PCR Microfluidic Chip and Its Detection with a Capillary Electrophoresis System
Published on: November 21, 2023
2.9K
Ultrasensitive colorimetric carcinoembryonic antigen biosensor based on hyperbranched rolling circle amplification
Kai Liang1, Shuiting Zhai, Zhidong Zhang
1Henan Provincial People's Hospital, Zhengzhou, Henan 450003, China.
The Analyst
|July 6, 2014
Summary
This study presents a novel colorimetric biosensor using hyperbranched rolling circle amplification (HRCA) for detecting carcinoembryonic antigen (CEA). The biosensor achieves high sensitivity and specificity for CEA detection, offering a promising diagnostic tool.
Area of Science:
- Biotechnology
- Nanotechnology
- Analytical Chemistry
Background:
- Carcinoembryonic antigen (CEA) is a significant biomarker for various cancers.
- Accurate and sensitive detection of CEA is crucial for early diagnosis and monitoring.
- Existing detection methods may lack sensitivity, specificity, or simplicity.
Purpose of the Study:
- To develop a highly sensitive and specific colorimetric biosensor for CEA detection.
- To utilize hyperbranched rolling circle amplification (HRCA) for signal amplification.
- To enable visual detection through color changes.
Main Methods:
- Development of a CEA aptamer-based recognition system.
- Integration of HRCA for amplifying the DNA signal upon target binding.
- Utilizing gold nanoparticles (AuNPs) for colorimetric detection based on aggregation inhibition.
- Establishing a linear relationship between absorbance ratio and CEA concentration.
Main Results:
- The biosensor demonstrated high sensitivity with a detection limit as low as 2 pM.
- A wide linear range for CEA detection was observed from 5 pM to 0.5 nM.
- The assay showed specificity attributed to the aptamer-target interaction.
- The colorimetric signal (absorbance ratio A520/A660) correlated linearly with CEA concentration.
Conclusions:
- The developed HRCA-based colorimetric biosensor offers a sensitive and specific method for CEA detection.
- The biosensor leverages aptamer recognition and AuNPs aggregation inhibition for signal generation.
- This approach holds potential for simple, rapid, and cost-effective cancer biomarker diagnostics.
