Description
General Description
PCL-PEG-OPSS is a biodegradable amphiphilic block copolymer developed for advanced drug delivery and thiol-specific bioconjugation. The hydrophobic poly(ε-caprolactone) (PCL) block readily self-assembles into polymeric micelles and nanoparticles capable of encapsulating hydrophobic therapeutics, while the hydrophilic polyethylene glycol (PEG) block improves water solubility, colloidal stability, prolonged circulation, and biocompatibility.
The terminal ortho-pyridyl disulfide (OPSS) group undergoes rapid and selective disulfide exchange with free sulfhydryl groups on peptides, proteins, antibodies, cysteine-containing ligands, and other thiolated biomolecules. This reaction forms reversible disulfide bonds while releasing pyridine-2-thione, allowing efficient conjugation under mild conditions.
Because the resulting disulfide linkage is cleavable under intracellular reducing conditions, PCL-PEG-OPSS is widely used for preparing redox-responsive nanoparticles, targeted drug delivery systems, antibody-polymer conjugates, peptide-functionalized nanocarriers, and other advanced biomaterials.
Applications
- Polymeric micelle preparation
- Nanoparticle fabrication
- Targeted drug delivery
- Thiol-selective bioconjugation
- Antibody conjugation
- Peptide conjugation
- Protein modification
- Redox-responsive drug delivery
- Surface functionalization
- Biomaterials research
Features and Benefits
- Amphiphilic PCL-PEG block copolymer
- Terminal OPSS functionality
- Selective thiol-reactive chemistry
- Cleavable disulfide linkage
- Biodegradable PCL segment
- Excellent aqueous dispersibility
- Suitable for redox-responsive systems
- Research-grade quality
