KEY FEATURES: ? Sulfo-NHS-Biotin is amine-reactive and has a spacer arm length of 13.5 A. ? Water-soluble; can be used under physiologic conditions ? The amide bond formed is permanent and the alkyl spacer arm cannot be cleaved APPLICATIONS: ? Sulfo-NHS-Biotin is ideal for biotinylating antibody or protein that can then be used for protein detection or immobilization ? Sulfo-NHS-Biotin is particularly useful for targeting cell surface proteins due to the membrane-impermeability of this reagent. MW: 443.43. Purity ≥85% by NMR