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Published on: March 21, 2018
Amplified electrochemical aptasensor taking AuNPs based sandwich sensing platform as a model
Bingling Li1, Yuling Wang, Hui Wei
1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, PR China.
Biosensors & Bioelectronics
|November 13, 2007
Summary
This study presents a new electrochemical aptasensor for detecting thrombin, a key protein in blood clotting. The novel design significantly enhances detection sensitivity for thrombosis and hemostasis research.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Biosensor Technology
Background:
- Thrombin is a critical serine protease involved in thrombosis and hemostasis.
- Accurate detection of thrombin is essential for diagnosing and managing related medical conditions.
- Existing impedimetric aptasensors often face limitations in sensitivity.
Purpose of the Study:
- To develop a highly sensitive amplified electrochemical impedimetric aptasensor for thrombin detection.
- To improve upon existing methods for protein detection using aptasensors.
- To investigate signal amplification strategies for enhanced biosensing.
Main Methods:
- Fabrication of a sandwich sensing platform using thiolated aptamers immobilized on a gold substrate.
- Utilizing aptamer-functionalized gold nanoparticles (AuNPs) for signal amplification.
- Electrochemical impedance spectroscopy (EIS) for signal measurement.
- Investigating the impact of 6-mercaptohexanol (MCH) and 2-mercaptoethanol (MCE) on electrode modification.
Main Results:
- Achieved a sensitive detection limit of 0.02 nM for thrombin.
- Established a linear detection range from 0.05 nM to 18 nM.
- Demonstrated improved sensitivity compared to previously reported impedimetric aptasensors.
- Validated the aptasensor as a promising model for amplified aptamer-based protein detection.
Conclusions:
- The developed aptasensor offers a sensitive and reliable method for thrombin detection.
- The sandwich sensing platform with AuNPs provides effective signal amplification.
- This approach holds potential for advancements in clinical diagnostics related to thrombosis and hemostasis.
- Further studies can explore optimization of electrode modification for enhanced performance.
