Biotin-PEG23-amine is biotinylation reagent containing an extended PEG spacer and a terminal primary amine group. The amine group can conjugate with carboxylic acid bearing molecules and form a stable amide bonds. The extended PEG spacer increases the aqueous solubility of the biotinylated conjugates and helps minimize steric hindrance derived from binding to strepavidin and avidin.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.