Photochemical activation of surfaces for attaching biomaterial

A composition comprising a monomolecular layer of a water-soluble photo-activatable polymer and a matrix having at least one carbon, wherein the photo-activatable polymer comprises

• (a) a photo-activatable group, wherein the photo-activatable group is adapted to be activated by an irradiation source and to form a covalent bond between the water-soluble photo-activatable polymer and a matrix having at least one carbon;
• (b) a reactive group, wherein the reactive group is adapted to covalently react with a biomaterial;
• (c) a hydrophilic group, wherein the hydrophilic group is present in an amount sufficient to make the water-soluble photo-activatable polymer soluble in water;
• and
• (d) a polymer precursor;
• wherein the water-soluble polymer is represented by a formula:
• wherein n is 50 to 2000, k is 10 to 1000, and m is 10 to 1000;
• and
• wherein the matrix comprises a polymer or an organosilylated material, said polymer or organosilylated material comprising C—H bonds and said at least one carbon, and wherein the monomolecular layer is attached to the matrix by a covalent bond between the photo-activatable group and the at least one carbon.