L-tryptophan complex [Ru(bpy)2(L-Trp)]ClO4 has been synthesized and its electrochemiluminescent (ECL) characteristics investigated. It was found that this complex had ECL activity at platinum electrode when triangle pulse voltage was applied by using KCl as the support electrolyte. The ECL linear linear response range for this complex is 5.9×10^-^9～1.2×10^-^7mol . L^-^1, the detectable concentration (defined as the concentration which could be detected at S/N of 3) is 5.9×10^-^9mol . L^-^1, and the relative standard derivation for 5.9×10^-^8mol . L^-^1 of this complex is 5.3% (n=10). Based on the results of the electrochemical investigation, the mechanism of this complex was proposed.

Key words: TRYPTOPHAN, REACTION MECHANISM, POTASSIUM CHLORIDE, PERCHLORATE, ELECTROLUMINESCENCE, BIPYRIDINE P, RUTHENIUM COMPLEX, CHEMILUMINESSENCE