4arm PEG Vinylsulfone(4arm PEG VS), MW 20K is a 4arm PEG derivative with multiple reactive groups, the number of ethylene oxide units in the PEG chain may not be equal for all arms. Pegylation can increase the solubility and stability and reduce immunogenicity of peptides and proteins.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.