Second-order data obtained from differential pulse voltammetry: Determination of tryptophan at a gold nanoparticles decorated multiwalled carbon nanotube modified glassy carbon electrode
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Supplementary data
Date
2011-08-05
Authors
Kooshki, Mojtaba
Abdollahi, Hamid
Bozorgzadeh, Somayyeh
Haghighi, Behzad
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Published Version
Abstract
Three-way data obtained from different pulse heights of differential pulse voltammetry (DPV) was analyzed using multivariate curve resolution by alternating least squares (MCR-ALS) algorithm. Differential pulse voltammograms of tryptophan were recorded at a gold nanoparticles decorated multiwalled carbon nanotube modified glassy carbon electrode (GCE/MWCNTs-nanoAu). The determination of tryptophan was performed even in the presence of unexpected electroactive interference(s). Both the simulated and experimental data were non-bilinear. Therefore a potential shift algorithm was used to correct the observed shift in the data. After correction, the data was augmented and MCR-ALS was applied to the augmented data. A relative error of prediction of less than 8% for the determination of the simulated analyte of interest and tryptophan in synthetic samples indicated that the methodology employing voltammetry and second-order calibration could be applied to complex analytical systems.
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Keywords
Gold nanoparticles decorated multiwalled carbon nanotube modified glassy carbon electrode , Multivariate curve resolution by alternating least squares , Second order data , Tryptophan , Gold nanoparticles
Citation
Kooshki, M., Abdollahi, H., Bozorgzadeh, S. and Haghighi, B. (2011) 'Second-order data obtained from differential pulse voltammetry: Determination of tryptophan at a gold nanoparticles decorated multiwalled carbon nanotube modified glassy carbon electrode', Electrochimica Acta, 56 (24), pp. 8618-8624. doi: 10.1016/j.electacta.2011.07.049