TCO-PEG4-biotin a PEG derivative containing TCO and biotin moieties. This reagent can be used to tag a biotin site with the TCO moiety, which can conjugate with a tetrazine bearing biomolecule. The hydrophilic PEG spacer improves the water solubility of compoundsand adds flexibility to the conjugates. The biotin group binds strongly with strepavadin and avadin proteins.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.