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Effect of surface coverage of gold(111) electrode with cysteine on the chiral discrimination of DOPA
Author(s) -
Matsunaga Mariko,
Nakanishi Takuya,
Asahi Toru,
Osaka Tetsuya
Publication year - 2007
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.20376
Subject(s) - chemistry , redox , electrode , electrochemistry , monolayer , chirality (physics) , molecule , cysteine , self assembled monolayer , combinatorial chemistry , enantioselective synthesis , inorganic chemistry , catalysis , organic chemistry , enzyme , biochemistry , chiral symmetry breaking , physics , quantum mechanics , nambu–jona lasinio model , quark
The enantioselectivity imparted to a gold electrode by modifying its surface with a self‐assembled monolayer (SAM) of cysteine (Cys) was investigated for the electrochemical redox reaction of 3,4‐dihydroxyphenylalanine (DOPA). A cyclic voltammetric study of the redox reaction revealed that the enantioselectivity was determined by the surface coverage of the gold electrode with Cys molecules. The electrode modified with ∼1.8 × 10 14 Cys molecules cm −2 exhibited enantioselectivity in the voltammogram for the oxidation and reduction of DOPA, while the voltammograms obtained by the electrodes with either more or less surface coverages did not exhibit significant enantioselectivity. It is suggested that the accessibility of DOPA to that area of the gold surface which is not blocked by Cys molecules at an optimum surface coverage, is required for the enantioselective redox reaction of DOPA to proceed. Chirality, 2007. © 2007 Wiley‐Liss, Inc.