Nanoparticle surface

The nanoparticle surface is the critical interface between a synthetic nanomaterial and its surrounding biological environment, serving as the primary determinant of the particle's biological identity. Upon exposure to physiological fluids, the surface rapidly adsorbs a complex layer of proteins and biomolecules, known as the protein corona, which dictates the particle's colloidal stability, biodistribution, and recognition by the immune system [2, 4, 8]. Engineering the surface through modifications such as PEGylation provides stealth properties to evade the mononuclear phagocyte system, while the conjugation of ligands (e.g., antibodies or peptides) enables active targeting of specific diseased tissues [10, 11, 15]. Although it is not a traditional therapeutic target, the physicochemical properties of the nanoparticle surface—such as charge, hydrophobicity, and curvature—are essential for overcoming biological barriers and ensuring the effective delivery of payloads like small molecules or nucleic acids [6, 13, 17]. Key safety challenges include unintended opsonization, which leads to rapid clearance by the liver and spleen, and potential immunotoxicity arising from surface-mediated interactions with cell membranes [7, 12, 14].

Other names

Nanoparticle interfaceBiomolecular coronaSurface coronaNano-bio interfaceParticle surfaceNanoparticle-biological interface

The nanoparticle surface mediates therapeutic effects through passive targeting via the enhanced permeability and retention (EPR) effect and active targeting via surface-conjugated ligands that bind to specific cellular receptors, facilitating controlled drug release and intracellular delivery.