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Selective and Sensitive Electrochemical Sensor for L ‐Methionine at Physiological pH Using Functionalized Triazole Polymer Film Modified Electrode
Author(s) -
Revin S. Brillians,
John S. Abraham
Publication year - 2012
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.201200106
Subject(s) - ascorbic acid , electrode , amperometry , detection limit , electrochemistry , glassy carbon , chemistry , methionine , inorganic chemistry , amino acid , nuclear chemistry , cyclic voltammetry , chromatography , biochemistry , food science
This communication describes the determination of an essential amino acid, L ‐methionine ( L ‐Met) in the presence of important interferents, ascorbic acid (AA) and uric acid (UA) at physiological pH using a glassy carbon electrode modified with an electropolymerized film of 3‐amino‐5‐mercapto‐1,2,4‐triazole (p‐AMTa). The bare glassy carbon electrode fails to show a voltammetric signal for L ‐Met in the presence of AA and UA at pH 7.2. However, the p‐AMTa electrode separates the voltammetric signals of AA, UA and L ‐Met with pronounced oxidation currents. The amperometric current of L ‐Met was increased linearly from 1.0×10 −7 to 1×10 −4 M and the detection limit was found to be 4.12×10 −10 M ( S / N =3).