used for long-acting pegylation of biopharmaceuticals. could provide special structure for molecular.
Cyclic PEG refers to cyclic polyethylene glycol, a macrocyclic polymer synthesized via ring-closing reactions of linear PEG precursors. This structure eliminates terminal hydroxyl groups, enhancing stability and reducing immunogenicity compared to linear analogs. Typical molecular formulas vary by degree of polymerization (e.g., CnH2n+2On), though specific CAS numbers depend on exact molecular weight specifications.
Storage requires sealed containers at temperatures below 25°C to prevent oxidation or moisture absorption. Handling mandates standard chemical protective equipment; avoid inhalation of dust during processing. Clinical applications necessitate rigorous purity validation to ensure absence of residual linear impurities.