Binding of -mannose to poly(2-hydroxyethyl methacrylate) hydrogels by azo coupling

Crosslinked hydrogels based on poly(2-hydroxyethyl methacrylate) poly(HEMA) were prepared and modified with tyramine [4-(2-aminoethyl)phenol] to enable azo coupling with mannosyl derivatives, copolymerization of HEMA with polymerizable activated esters and surface modification reaction with 4-nitrophenyl chlorocarbonate for activation of the hydrogels were used.