Amino-PEG4-alcohol bears an amino group and a hydroxyl group. While the amino group readily reacts with carboxylic acids, activated NHS esters and carbonyls (ketone, aldehyde) etc., the hydroxyl group can be derivatized to other reactive functional groups. The hydrophilic PEG spacer can increase aqueous solubility.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.