Patent ID: 7741421

Claim:
A macromolecule identifying polymer having a molecular imprint of a macromolecule, comprising a structural unit derived from a vinyl monomer selected from the group consisting of N,N′-dimethylacrylamide, sodium acrylate, and acrylic acid, and a structural unit derived from polyethyleneglycol diacrylate having a solubility in water at 25° C. of 100% by mass or higher, wherein said macromolecule identifying polymer changes its volume by 5% or less when it is immersed in water; wherein said macromolecule identifying polymer is obtained by a method comprising polymerizing the vinyl monomer in an aqueous solution in the presence of the macromolecule, polyethyleneglycol diacrylate and a radical polymerization initiator to produce a polymer containing the macromolecule in its interior, and removing the macromolecule from the polymer containing the macromolecule to thereby produce the macromolecule identifying polymer having a molecular imprint of the macromolecule; and wherein said radical polymerization initiator is an azo compound represented by general formula (I) wherein R 1 and R 2 are independently a hydrogen atom or an alkyl group containing 1 to 3 carbon atoms and may be the same or different from each other, or a salt thereof.