Graphene Quantum Dot-Based Electrochemical Immunosensors for Biomedical Applications

Area of Science:

• Biomedical engineering
• Nanomaterials science
• Analytical chemistry

Background:

• Electrochemical sensors are vital for disease diagnosis, requiring high sensitivity and specificity.
• Nanomaterials enhance immunosensor performance for detecting low biomolecule concentrations.
• Graphene quantum dots (GQDs) offer unique properties like large surface area and catalytic activity.

Purpose of the Study:

• To review recent advances in GQD-based electrochemical immunosensors.
• To highlight GQD applications in detecting cancer, cardiovascular, and pathogenic diseases.
• To explain the principles of electrochemical immunosensing.

Main Methods:

• Review of literature on GQD-based electrochemical immunosensors.
• Focus on GQD properties and their role in enhancing sensor performance.
• Discussion of GQD peroxidase-mimicking activity for label-free assays.

Main Results:

• GQDs exhibit excellent biocompatibility, large surface area, and catalytic activity, improving immunosensor sensitivity and selectivity.
• GQD-based immunosensors can replace traditional horseradish peroxidase (HRP)-based systems.
• These sensors enable rapid, specific, and cost-effective detection of disease biomarkers.

Conclusions:

• GQD-based electrochemical immunosensors represent a significant advancement in biomedical diagnostics.
• Their unique properties facilitate early and rapid detection of various diseases.
• GQD immunosensors are suitable for miniaturization and point-of-care testing (POCT), promoting accessible diagnostics.