Patent ID: 7638024

Claim:
A capillary electrophoresis method comprising: simultaneously introducing an unknown sample and an internal standard substance to capillary electrophoresis, wherein said unknown sample is selected from the group consisting of proteins, nucleic acids and carbohydrates; determining an earliest one of detected peaks as a peak derived from said internal standard substance; and identifying the remaining peaks on the basis of said internal standard substance-derived peak, wherein said internal standard substance consists of a fluorescent substance or a salt thereof which has a positive or negative net charge of 2 or more in an electrolyte solution used for the capillary electrophoresis, and wherein said internal standard substance is selected from the group consisting of: 5(6)-carboxyfluorescein; 2′,7′-bis(2-carboxyethyl)-5(and-6)-carboxyfluorescein; and 5-carboxy-(and-6)-fluorescein-sulfonic acid, trisodium salt, and bis[N,N-bis(carboxymethyl)aminomethyl]fluoresceine.