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Preparation, Characterization and Electrochemical Application of ZnS/ZnAl 2 S 4 Nanocomposite for Voltammetric Determination of Methionine and Tryptophan Using Modified Carbon Paste Electrode
Author(s) -
Tajik Somayeh,
Taher Mohammad Ali,
Beitollahi Hadi,
Hosseinzadeh Rahman,
Ranjbar Mehdi
Publication year - 2016
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.201500423
Subject(s) - methionine , electrode , nanocomposite , detection limit , ferrocene , carbon paste electrode , electrochemistry , tryptophan , chemistry , materials science , nuclear chemistry , analytical chemistry (journal) , cyclic voltammetry , chromatography , nanotechnology , amino acid , biochemistry
ZnS/ZnAl 2 S 4 nanocomposite and 2‐chlorobenzoyl ferrocene, were synthesized and used to construct a modified carbon paste electrode. The electrooxidation of methionine at the surface of the modified electrode was studied. Under the optimized conditions, the square wave voltammetric (SWV) peak current of methionine increased linearly with methionine concentration in the range of 5.0×10 −8 to 8.0×10 −4 M and detection limit of 10.0 nM was obtained for methionine. The prepared modified electrode exhibits a very good resolution between the voltammetric peaks of methionine and tryptophan which makes it suitable for the detection of methionine in the presence of tryptophan in real samples.