International Journal of Biochemistry and Biophysics Vol. 6(2), pp. 58 - 69
DOI: 10.13189/ijbb.2018.060204
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Carbon Paste Electrode Modified by Multiwalled Carbon Nanotube "for Electrochemical Determination" of Vitamin C

M. Khodari ^*, E. M. Rabie , A. A. Shamroukh
Chemistry Department, Faculty of Science, South Valley University, Qena, Egypt

ABSTRACT

Carbon Paste Electrode Modified by silica gel /MWCNTs was manufactured and used for the electrochemical determination of Ascorbic acid (AA) in acetate buffer (pH=5.0) using cyclic, linear sweep voltammetry and square wave voltammetry(CV, LSV, and SWV). The results illustrated that the carbon paste modified electrode give a good response for an electrocatalytic activity toward the oxidation of AA. The electrochemical oxidation of AA at modified carbon paste electrode was diffusion-controlled and irreversible, using the optimum conditions to achieve the lower detection limit 1.07 × 10^-8M, good reproducibility, and high stability. This method has been applied to the determination of AA in orange and lemon fruits, and the recoveries were from 96% to 102%.

KEYWORDS
Silica Gel, MWCNTs, Modified Carbon Paste Electrode, Ascorbic Acid, Square-wave Voltammetry

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] M. Khodari , E. M. Rabie , A. A. Shamroukh , "Carbon Paste Electrode Modified by Multiwalled Carbon Nanotube "for Electrochemical Determination" of Vitamin C," International Journal of Biochemistry and Biophysics, Vol. 6, No. 2, pp. 58 - 69, 2018. DOI: 10.13189/ijbb.2018.060204.

(b). APA Format:
M. Khodari , E. M. Rabie , A. A. Shamroukh (2018). Carbon Paste Electrode Modified by Multiwalled Carbon Nanotube "for Electrochemical Determination" of Vitamin C. International Journal of Biochemistry and Biophysics, 6(2), 58 - 69. DOI: 10.13189/ijbb.2018.060204.