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Spectroelectrochemical and Voltammetric Studies of L ‐DOPA
Author(s) -
Liu Xiaoqiang,
Zhang Zheling,
Cheng Guangjin,
Dong Shaojun
Publication year - 2003
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200390009
Subject(s) - electrochemistry , reaction rate constant , cyclic voltammetry , chemistry , glassy carbon , electron transfer , reaction mechanism , electrode , chemical reaction , voltammetry , redox , inorganic chemistry , analytical chemistry (journal) , kinetics , chromatography , organic chemistry , catalysis , physics , quantum mechanics
The electrooxidation of L ‐dopa at GC electrode was studied by in situ UV‐vis spectroelectrochemistry (SEC) and cyclic voltammetry. The mechanism of electrooxidation and some reaction parameters were obtained. The results showed that the whole electrooxidation reaction of L ‐dopa at glassy carbon (GC) electrode was an irreversible electrochemical process followed by a chemical reaction in neutral solution (EC mechanism). The spectroelectrochemical data were treated by the double logarithm method together with nonlinear regression, from which the formal potential E 0 =228 mV, the apparent electron‐transfer number of the electrooxidation reaction αn =0.376 ( R =0.99, SD=0.26), the standard electrochemical rate constant k 0 =(3.93±0.12)×10 − 4 cm s −1 (SD=1.02×10 −2 ), and the formation equilibrium constant of the following chemical reaction k c =(5.38±0.34)×10 −1 s −1 (SD=1.02×10 −2 ) were also obtained.