Biorecognition on graphene: physical, covalent, and affinity immobilization methods exhibiting dramatic differences
Adeline Huiling Loo1, Alessandra Bonanni, Martin Pumera
1Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
Chemistry, an Asian Journal
|October 24, 2012
Summary
Choosing the right DNA aptamer immobilization method is key for biosensor performance. Physical and covalent methods offer higher selectivity for thrombin aptasensors compared to affinity methods.
Area of Science:
- Biosensor development
- Biomolecule immobilization
- Surface chemistry
Background:
- Effective biorecognition layers are crucial for sensitive and selective biosensors.
- Various immobilization protocols exist for attaching biomolecules to electrode surfaces.
Purpose of the Study:
- To investigate the impact of DNA aptamer immobilization protocols on thrombin aptasensor performance.
- To compare the selectivity and optimal immobilized aptamer quantity across different immobilization methods.
Main Methods:
- Fabrication of thrombin aptasensors using physical, covalent, and affinity immobilization techniques.
- Comparative analysis of aptasensor selectivity and optimal aptamer loading.
- Evaluation of performance differences based on immobilization strategy.
Main Results:
- All three immobilization methods (physical, covalent, affinity) demonstrated a similar optimal amount of immobilized DNA aptamer.
- Physical and covalent immobilization methods resulted in significantly higher selectivity compared to affinity immobilization.
- The choice of immobilization protocol directly influences the selectivity of the fabricated aptasensor.
Conclusions:
- Physical and covalent immobilization are superior to affinity methods for enhancing the selectivity of graphene-based thrombin aptasensors.
- Findings provide critical insights for optimizing aptasensor design and fabrication.
- Optimized immobilization strategies are essential for developing high-performance biosensing platforms.
