Biotin-PEG-biotin, MW 5K is a homobifunctional PEG polymer containing biotin at both ends of the molecular chain. The PEG linked to biotin forms an extended spacer arm that enables biotin to enter the binding pocket of the protein. Biotin can be easily detected by biotin/streptavidin binding assays and is widely used for molecular target detection.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.