Biotin-PEG12-TFP ester contains a TFP ester group. It conjugates with primary amine containing biomolecule to form a stable, irreversible amide bonds. The hydrophilic PEG spacer increases water solubility of the resulting biotinylated molecule.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.