this invention features a biomolecule - bound substrate that includes a support made of an organic polymer and having an unmodified surface ; and a plurality of unmodified biomolecules immobilized on the unmodified surface . the organic polymer is acrylic resin , polypropylene , polystyrene , polyethylene , polyvinyl chloride , polysulfone , polycarbonate , cellulose acetate , rubber , latex , polyethylene terephthalate , acrylonitrile butadiene styrene , acrylonitrile styrene , or a combination thereof . the substrate is formed by placing the unmodified biomolecules on the unmodified surface followed by ultraviolet irradiation .