Patent ID: 6927033

Claim:
Biosensor chips in which a polymer represented by the following general formula (I) is absorbed (or adsorbed) onto the sensor chip surfaces via the mercapto group present at one end of said polymer: general formula (I) HS-L 1 -(B) m -L 2 -(CH 2 CH 2 O) n -L 3 -X (I) in which L 1 , L 2 and L 3 represent valence bonds or linkers independently of each other, but where m is zero (0), L 1 and L 2 may together form a valence bond or a linker; B stands for a formula, where R 1 and R 2 each independently stands for hydrogen atom or C 1-5 alkyl group and p is an integer of 2-5; X stands for a hydrogen atom, functional group or ligand; m is an integer of 0-10,000, and n is between an integer which provides a number average molecular weight of 2,000 and an integer of 20,000.