Biotin-PEG6-t-butyl ester contains a biotin and a t-butyl ester. The biotin group is used for the conjugation of proteins and can also be used for biotin labeling. The t-butyl protected carboxyl group can be deprotected under acidic conditions to form a free acid group, which can conjugate with amine bearing biomolecule through amide coupling conditins.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.