Abstract: Plastics surfaces are preactivated for immobilizing organo-chemical and biologic materials by coating the surfaces with a polypeptide which consists of a defined composition of hydrophobic amino acids and amino acids having side chains capable of activation and coupling. After activation of the plastics surfaces having been coated in this manner with various coupling reagents, it is possible to firmly fix organo-chemical and biologic materials. The materials having been immobilized in this manner are extremely stable to various reaction conditions.

Abstract: Luminescence immunoassays for haptens can be improved and made more sensitive by using a luminescence labelled hapten conjugate which contains as the linkage group a chain-like polymer having repeating functional groups having bound thereto per mole both a plurality of moles of groups capable of luminescence and a plurality of moles of hapten. The antibody used is preferably one which is prepared by the use of another chain-like polymer having bound thereto the hapten by a different chemical reaction.