N-(Propargyl-PEG4)-biocytin is PEG derivative containing a biotin group and an alkyne group. The alkyne group can react with azide moiety through Click Chemistry reaction.The hydrophilic PEG spacer can increase aqueous solubility of the biotin conjugated molecules. It also can also help minimize steric hindrance and provide extra flexibility with the binding to stravidin and avidin molecules.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.