Biotin-NHS ester CAS: 89889-52-1 can react efficiently with primary amino groups (-NH2) to form stable, irreversible amide bonds. Biotin-NHS ester membrane permeability allows it to be used for intracellular labeling.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.
