Patent ID: 8304259

Claim:
A labeling dye used for detecting a biomolecule by measurement of fluorescence, wherein the dye comprises a coloring portion comprising an organic EL-dye, a bonding portion to be bonded with the biomolecule and a spacer portion for linking the coloring portion and the bonding portion, wherein said spacer portion is represented by the following general formula (I) —(CHR′) p —X—(CHR″) q — (I) wherein X represents a direct bond, or at least one functional group selected from the group consisting of —NHCOO—, —CONH—, —COO—, —SO 2 NH—, —HN—C(═NH)—NH—, —O—, —S—, —NR—, —CH═CH—, —C≡C—, —AR— and —CO—Ar—NR—; R′ and R″ each independently represent a hydrogen atom, an aliphatic hydrocarbon group, or an aromatic hydrocarbon group, and wherein the aliphatic hydrocarbon group or the aromatic hydrocarbon group is optionally substituted with any one charge group selected from the group consisting of a sulfonyl group, hydroxyl group, quaternary ammonium group and carboxyl group; Ar represents an aryl group; and p and q each independently represent an integer of 0 to 20, wherein the value of “p+q” is greater than or equal to 1.