Sulfo-NHS-SS-biotin is a cleavable reagent useful for introducing a biotin moiety to amine containging proteins and cell surfaces. This biotin linker is membrane-impermeable due to its negatively charged, water soluble sulfonate group. The disulfide bond in this linker can be cleaved using reducing agents such as DTT, BME and TCEP.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.