Patent ID: 7229840

Claim:
An object with a base surface, said object comprising a hydrogel on the base surface; a plurality of organic spacer residues bound to said hydrogel; and a plurality of receptors bound to said organic spacer residues; wherein each of said organic spacer residues is attached between said hydrogel and a respective one of said receptors; each of said organic spacer residues comprises a respective chain of atoms with a corresponding chain length of at least eight atoms; each of said receptors has at least three residues (B) of the same type; and said at least three residues are each selected from the group consisting of amine groups, a carboxyl group, sulfonic acid groups, phosphoric acid groups, phosphonic acid groups, and derivatives thereof; and wherein each of said receptors is bonded to said respective chain of said atoms by reacting a terminal group (A) of said respective chain of said atoms with a receptor molecule and wherein said terminal group (A) is selected from the group consisting of amine groups, a carboxyl group, and derivatives thereof; so that said receptors are bound with said hydrogel in a flexible undirected manner.