[Technological Perspectives in Developing Carbon Nanotube-based DNA-modified Biosensors]

Area of Science:

• Nanomaterials Science
• Biotechnology
• Analytical Chemistry

Context:

• Carbon nanotubes (CNTs) are increasingly utilized in biosensing applications due to their unique electrical and mechanical properties.
• Developing selective biosensors is crucial for accurate disease diagnosis and personal health monitoring.
• Aptamers, short DNA sequences, can be functionalized onto nanomaterials to create specific molecular recognition elements.

Purpose:

• To investigate the response of DNA-modified carbon nanotubes when exposed to specific biomarkers like thrombin and albumin.
• To analyze the interaction between aptamers and carbon nanotubes using Raman spectroscopy and electrical resistance measurements.
• To evaluate the potential of this aptamer-CNT system as a highly selective biosensor.

Summary:

• Raman spectroscopy and resistance analysis revealed that aptamer-carbon nanotube interconnection decreases G-band intensity and sensor resistance.
• The biosensor demonstrated significantly different responses when exposed to thrombin compared to albumin.
• These distinct responses confirm the aptamer-CNT system's capability for selective biomolecule detection.

Impact:

• This research lays the foundation for developing next-generation personal health monitoring systems.
• The findings contribute to the advancement of highly selective and sensitive electrochemical biosensors.
• Demonstrates a novel approach for label-free detection of clinically relevant proteins using nanomaterial-based aptasensors.