4arm-PEG-SAS (4arm-PEG-Succinimidyl Amido Succinate), MW 10K is a multi-arm PEG with a succinimidyl NHS ester group at each end of the four arms attached to a pentaerythritol core derivative. Coupling between succinimidyl ester and -NH2 can be accomplished rapidly at pH 7-9 by covalent amide bond formation. It is widely used in the modification of polyethylene glycol (PEG) in various biological nanomaterials.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.