Nanoparticle

Nanoparticle designates a particle typically ranging from 1-1000 nanometres in size with physicochemical properties distinct from bulk materials due to increased surface area and interfacial effects. In biopharmaceutical contexts, nanoparticles serve as delivery vehicles, imaging agents, vaccine carriers, or therapeutic materials capable of transporting drugs, proteins, peptides, or nucleic acids to specific tissues while improving stability, solubility, and pharmacokinetic performance.

The biopharmaceutical industry employs nanoparticles to overcome limitations of conventional drug delivery, particularly for poorly soluble compounds, unstable biologics, and nucleic acid therapeutics. Nanoparticle formulations improve therapeutic index by reducing off-target toxicity and enhancing drug accumulation at disease sites. Lipid nanoparticles have enabled breakthrough clinical translation of mRNA vaccines and siRNA therapeutics by facilitating intracellular delivery and endosomal escape. Critical design parameters include particle size, surface charge, and release kinetics. Manufacturing requires stringent control over particle formation methods, scalability, sterility, and stability. Regulatory evaluation demands detailed characterisation and demonstration of batch consistency, with safety assessment focusing on immunogenicity and organ accumulation.