Bromoacetamide-PEG3-acetic acid contains a bromoactamide and an acid group on the terminus. Bromoacetamide is well known cysteine labelling and capping reagents. It readily reacts with thiol containing molecules through nucleophilic substitution and forms a sulfide bond. The acid end group can be used to conjugate with an amine-bearing biomolecule. PEG spacer increases the solubility of the resulting compound in aqueous media.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.