Hydroxy-PEG2-sulfonic acid bears a hydroxyl and a sulfonic acid moiety. The hydroxyl group can be derivatized to varous functional groups for conjugation purpose. The sulfonic acid group is well known to undergo esterification, halogenation. The PEG spacer increase the water solubility of the resulting conjugated complex.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.