NDLI: A combination of nordihydroguaiaretic acid as an electron transfer mediator and multi-walled carbon nanotubes for simultaneous electrocatalytic determination of noradrenaline, uric acid, and tryptophan

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A combination of nordihydroguaiaretic acid as an electron transfer mediator and multi-walled carbon nanotubes for simultaneous electrocatalytic determination of noradrenaline, uric acid, and tryptophan

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Catalysis Science & Technology Vol - 3 Issue - 4

Catalysis Science & Technology Vol - 3 Issue - 3

Catalysis Science & Technology Vol - 3 Issue - 2

Catalysis Science & Technology Vol -2

Catalysis Science & Technology Vol -1

A combination of nordihydroguaiaretic acid as an electron transfer mediator and multi-walled carbon nanotubes for simultaneous electrocatalytic determination of noradrenaline, uric acid, and tryptophan

Content Provider	Royal Society of Chemistry (RSC)
Author	Zare, Hamid R. Benvidi, Ali Nasirizadeh, Navid Rahmani, Nasibeh
Copyright Year	2013
Abstract	A sensitive and selective electrochemical method for determining noradrenaline (NA) was developed using an electron transfer mediator, nordihydroguaiaretic acid (NDGA), electrodeposited on multi-walled carbon nanotubes (MWCNT). Nordihydroguaiaretic acid MWCNT modified GCE (NDGA-MWCNT-GCE) proved to have an excellent electrocatalytic activity for the oxidation of NA in a phosphate buffer solution (pH 7.0). The cyclic voltammetric responses of NDGA-MWCNT-GCE at various potential scan rates show a characteristic shape typical of an EC catalytic process. The kinetic parameters such as electron transfer coefficient, α, and catalytic electron transfer rate constant, k′, for the oxidation of NA at the NDGA-MWCNT-GCE surface were estimated using a cyclic voltammetry method. The diffusion coefficient of NA was also estimated using chronoamperometry. The plot of peak current versus NA concentration was constituted of two linear segments with different slopes, corresponding to two different concentration ranges of 2.0–28.0 μM and 28.0–310.0 μM, using a differential pulse voltammetric method (DPV). The average voltammetric peak current and the precision estimated in terms of the coefficient of variation for repeated measurements (n = 7) of 3.7 μmol L−1 NA at NDGA-MWCNT-GCE were obtained as 0.48 μA and 4.2% respectively. At the modified electrode surface, the peaks of DPV for NA, uric acid (UA) and tryptophan (Trp) were clearly separated from each other when they co-existed in solution. The modified electrode was used to determine NA in an injection solution. The results obtained are in very good agreement with those declared in the label of the pharmaceutical products.
Starting Page	1224
Ending Page	1233
Page Count	10
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	3
Issue Number	5
Journal	Catalysis Science & Technology
DOI	10.1039/c3cy20761g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Acid Electrode Tryptophan Urban area UA Electroplating Buffer solution Heat transfer coefficient Carbon nanotube Cyclic voltammetry Trp NDGA Phosphate Electrochemistry PH Norepinephrine Diffusion Chronoamperometry EC
Content Type	Text
Resource Type	Article
Subject	Catalysis

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