PEG200

PEG200 (CAS No.: 25322-68-3) is a low-molecular-weight polyethylene glycol belonging to a class of neutral, hydrophilic polymers composed of repeating ethylene glycol units, widely utilized in biomedical research for its excellent water solubility, low immunogenicity, and high biocompatibility. As a chemically inert polymer lacking specific receptor-mediated activity, PEG200 does not directly engage defined molecular targets or signaling pathways but instead exerts its function through physicochemical mechanisms such as modulation of solvent properties, macromolecular crowding, and stabilization of biomolecules. In experimental systems, polyethylene glycols of varying chain lengths are commonly employed to facilitate nucleic acid handling, protein stabilization, and macromolecule precipitation, with lower-molecular-weight variants like PEG200 frequently serving as solvents, co-solvents, or viscosity modifiers in drug formulation and screening workflows. While quantitative activity metrics such as IC50 or EC50 are not applicable due to its non-bioactive nature, PEG200 plays an essential supportive role in in vitro and in vivo models by enhancing compound solubility and influencing membrane permeability or diffusion characteristics. The concentrations or doses used in experiments typically depend on specific experimental designs and research objectives, particularly in studies involving formulation optimization, delivery system development, and assay conditioning.