CL : Vol. 34 (2005) , No. 8 p.1120

Selective Electrochemical Response of Dopamine against 3,4-Dihydroxyphenylacetic Acid at Bare Indium–Tin Oxide Electrode

Guobao Xu¹⁾, Yuzuru Iwasaki¹⁾²⁾ and Osamu Niwa¹⁾³⁾

1) CREST, Japan Science and Technology Agency
2) NTT Microsystem Integration Laboratories
3) National Institute of Advanced Industrial Science and Technology (AIST)

(Received April 13, 2005)

Electrochemistry of dopamine and 3,4-dihydroxyphenylacetic acid at ITO were investigated. The oxidation of dopamine significantly depended on pH and supporting electrolyte. The peak current increased more than one hundred folds with increasing pH from 2.5 to 10.0 in phosphate buffer. Moreover, selective oxidation of dopamine against 3,4-dihydroxyphenylacetic acid at bare ITO was observed. It is the first electrode material that can be produced in large scale for selective oxidation of dopamine. Selective catecholamine detection at ITO is suggested.