NDLI: Electrocatalytic oxidation of glutathione at carbon paste electrode modified with 2,7-bis (ferrocenyl ethyl) fluoren-9-one: application as a voltammetric sensor

Content Provider	Springer Nature Link
Author	Raoof, J. B. Ojani, R. Karimi Maleh, H.
Copyright Year	2009
Abstract	Electrooxidation of glutathione (GSH) was studied at the surface of 2,7-bis (ferrocenyl ethyl) fluoren-9-one modified carbon paste electrode (2,7-BFEFMCPE). Cyclic voltammetry (CV), double potential-step chronoamperometry, and differential pulse voltammetry (DPV) were used to investigate the suitability of this ferrocene derivative as a mediator for the electrocatalytic oxidation of GSH in aqueous solutions with various pH. Results showed that pH 7.00 is the most suitable pH for this purpose. At the optimum pH, the oxidation of GSH at the surface of this modified electrode occurs at a potential of about 0.410 V versus Ag\|AgCl\|KCl$_{sat}$. The kinetic parameters such as electron transfer coefficient, α = 0.61, and rate constant for the chemical reaction between GSH and redox site in 2,7-BFEFMCPE, k $_{h}$ = 1.73 × 10$^{3}$ cm$^{3}$ mol$^{−1}$ s$^{−1}$, were also determined using electrochemical approaches. Also, the apparent diffusion coefficient, D $_{app}$, for GSH was found to be 5.0 × 10$^{−5}$ cm$^{2}$ s$^{−1}$ in aqueous buffered solution. The electrocatalytic oxidation peak current of GSH showed a linear dependence on the glutathione concentration, and linear calibration curves were obtained in the ranges of 5.2 × 10$^{−5}$ M to 4.1 × 10$^{−3}$ M and 9.2 × 10$^{−7}$ M to 1.1 × 10$^{−5}$ M with cyclic voltammetry and differential pulse voltammetry methods, respectively. The detection limits (3σ) were determined as 1.4 × 10$^{−5}$ M and 5.1 × 10$^{−7}$ M for the CV and DPV methods, respectively. This method was also examined as a selective, simple, and precise new method for voltammetric determination of GSH in real sample such as hemolysed erythrocyte.
Starting Page	1169
Ending Page	1175
Page Count	7
File Format	PDF
ISSN	0021891X
Journal	Journal of Applied Electrochemistry
Volume Number	39
Issue Number	8
e-ISSN	15728838
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-01-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	2,7-bis (Ferrocenyl ethyl) fluoren-9-one Glutathione Electrocatalysis Cyclic voltammetry Differential pulse voltammetry Chronoamperometry Hemolysed erythrocyte Industrial Chemistry/Chemical Engineering Physical Chemistry Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Electrochemistry

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