METHOD FOR PROTEIN DETERMINATION, INDICATOR FOR PROTEIN DETERMINATION, AND TEST PIECE FOR PROTEIN DETERMINATION

摘要

The present invention relates to a technique for assaying a protein. With the present invention, a compound having a chemical structure expressed by the following Chemical Formula (1) is used as a protein assay indicator. In Chemical Formula (1), X1 is a halogen, a nitro group, or a nitroso group; X2 is a halogen; X3 is a halogen or hydrogen; X4 is a hydroxyl group or a salt thereof; and X5 is a carboxyl group or a salt thereof.