Voltammetric Determination of Tryptophan Using a Carbon Paste Electrode Modified with Magnesium Core Shell Nanocomposite and Ionic Liquids
Publish Year: 1397
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_ANALCH-5-1_005
تاریخ نمایه سازی: 16 بهمن 1401
Abstract:
A novel carbon paste electrode modified with ionic liquid (n-hexyl-۳-methylimidazolium hexafluoro phosphate) and magnetic core-shell manganese ferrite nanoparticles (MCSILCPE) was fabricated. The electrochemical study of the modified electrode, as well as its efficiency for electro-oxidation of tryptophan, is described. Cyclic voltammetry (CV), choronoamperometry (CHA) and square wave voltammetry (SWV) were used to investigate oxidation of tryptophan in aqueous solution. The diffusion coefficient (D=۳.۵۳ ×۱۰-۶ cm۲/s), was determined using electrochemical approaches. It has been found that under an optimum condition (pH ۷.۰), the oxidation of tryptophan at the surface of such an electrode occurs at a potential about ۱۵۰ mV less positive than that of an unmodified carbon paste electrode. SWV exhibits a linear dynamic range from ۵.۰×۱۰-۶ to ۴.۰×۱۰−۴ M tryptophan. The morphology of the modified electrode was studied using SEM. The limit of detection was equal to ۱.۱×۱۰-۶ M. The electrode was also employed to determination of tryptophan in urine samples.
Keywords:
tryptophan , Magnetic core-shell manganese ferrite nanoparticles , Ionic Liquids , Chemically modified electrodes
Authors
Sayed Zia Mohammadi
Payame Noor University
Hadi Beitollahi
aEnvironment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
Mohsen Hassanzadeh
Department of Chemistry, Payamenoor University, Bam, Iran
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