Patent ID: 7873398

Claim:
A saccharide-measuring fluorescence sensor substance comprising a copolymer of at least the following two compounds (I) and (II): (I) a fluorescent monomer compound represented by the following formula (1): wherein: Q, Q′ and D 3 may be the same or different, may be combined together into a fused ring, and are each a substituent selected from the group consisting of a hydrogen atom, a halogen atom, a hydroxyl group, and substituted or unsubstituted alkyl, acyl, oxyalkyl, carboxyl, carboxylate ester, carboxamido, cyano, nitro, amino and aminoalkyl groups; D 1 , D 2 and D 4 each represent a substituent, wherein at least one of D 1 , D 2 and D 4 is a substituent group comprising a vinyl group at an end thereof, and wherein the substituent group comprising a vinyl group at an end thereof enables the fluorescent monomer compound to be soluble in water, and (II) at least one hydrophilic, polymerizable monomer comprising a vinyl group, wherein said polymerizable monomer (II) is a compound represented by the following formula (6): wherein A is a hydrogen atom or a methyl group, and U and U′ may be the same or different and are each a substituted or unsubstituted alkyl group.