Journal
APPLIED SURFACE SCIENCE
Volume 303, Issue -, Pages 37-45Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2014.02.039
Keywords
Diphenylalanine; Nanotube; Pencil graphite electrode; Vitamin B-12
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Funding
- Scientific Research Project Coordination Unit, Hacettepe University, Turkey under Teaching Staff Training Program [06K 120650]
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In this study, peptide nanostructures from diphenylalanine were synthesized in various solvents with various polarities and characterized with Scanning Electron Microscopy (SEM) and Powder X-ray Diffraction (PXRD) techniques. Formation of peptide nanofibrils, nanovesicles, nanoribbons, and nanotubes was observed in different solvent mediums. In order to investigate the effects of peptide nanotubes (PNT) on electrochemical behavior of disposable pencil graphite electrodes (PGE), electrode surfaces were modified with fabricated peptide nanotubes. Electrochemical activity of the pencil graphite electrode was increased with the deposition of PNTs on the surface. The effects of the solvent type, the peptide nanotube concentration, and the passive adsorption time of peptide nanotubes on pencil graphite electrode were studied. For further electrochemical studies, electrodes were modified for 30 min by immobilizing PNTs, which were prepared in water at 6 mg/mL concentration. Vitamin B-12 analyses were performed by the Square Wave (SW) voltammetry method using modified PGEs. The obtained data showed linearity over the range of 0.2 mu M and 9.50 mu M Vitamin B-12 concentration with high sensitivity. Results showed that PNT modified PGEs were highly simple, fast, cost effective, and feasible for the electro-analytical determination of Vitamin B-12 in real samples. (C) 2014 Elsevier B.V. All rights reserved.
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