Graphene oxide (GO), a chemically modified form of graphene decorated with oxygen-containing functional groups such as hydroxyl, epoxy, and carboxyl groups, represents a highly promising material in biological and biomedical research due to its unique physicochemical properties. These functional groups confer exceptional hydrophilicity, chemical reactivity, and biocompatibility to GO, enabling its wide application across drug delivery, diagnostics, tissue engineering, and therapeutic modalities.

Unique Properties of Graphene Oxide

• High surface area and porous structure: Facilitates efficient loading and controlled release of therapeutic molecules including drugs and genes.
• Abundant oxygen functional groups: Provide facile sites for chemical functionalization, allowing targeted delivery and enhanced biocompatibility.
• Excellent dispersibility in aqueous solutions: Overcomes the hydrophobicity limitation of pristine graphene for biological environments.
• Mechanical robustness and flexibility: Suitable for forming composites and hydrogels that mimic biological matrices.
• Intrinsic antimicrobial and catalytic activities: Useful for antibacterial treatments and enzymatic mimicking in biosensors.

Biomedical Applications of Graphene Oxide

• Targeted Drug and Gene Delivery Systems: GO serves as a versatile carrier facilitating controlled and stimuli-responsive release, reducing side effects and enhancing therapeutic efficacy.
• Tissue Engineering and Regeneration: Incorporation of GO in hydrogels and scaffolds promotes cell adhesion, proliferation, and differentiation, contributing to vascular, bone, and cartilage repair.
• Biosensing and Diagnostic Devices: GO-based nanozymes mimic enzyme activity and enable sensitive detection platforms for biomolecules, enhancing diagnostic precision.
• Photothermal and Photodynamic Therapy: GO efficiently converts near-infrared light into heat or reactive oxygen species, enabling targeted cancer cell ablation with minimal harm to surrounding tissues.
• Antibacterial and Antiviral Agents: GO exhibits intrinsic antimicrobial properties and enhances efficacy when functionalized with metal nanoparticles.

Innovations and Recent Advances

• Development of multifunctional GO composites: Enhanced mechanical and biological properties achieved through metal nanoparticle decoration.
• Saccharide-functionalized GO: Improved biocompatibility and targeting capabilities in complex biological systems.
• Integration into photo-curable hydrogels: Exhibits outstanding hemocompatibility for vascular applications.