Author/Authors :
Mazloum-Ardakani, Mohammad Department of Chemistry - Faculty of Science - Yazd University, Yazd, Iran , Abolhasani-Soorki, Mahboobe Department of Chemistry - Faculty of Science - Yazd University, Yazd, Iran , Khoshroo, Alireza Department of Chemistry - Faculty of Science - Yazd University, Yazd, Iran , Sabaghian, Fariba Department of Chemistry - Faculty of Science - Yazd University, Yazd, Iran , Mirjalili, Bibi-Fatemeh Department of Chemistry - Faculty of Science - Yazd University, Yazd, Iran
Abstract :
In the present paper, electrochemical methods were used to investigate the behavior of ascorbic
acid at a carbon paste electrode modified with 2,2′-((1E)-(1,2 phenylenebis(azanylylidene))
bis(methanylylidene))bis(benzene-1,4-diol) (PBD) and oxidized multiwall carbon nanotubes.
The modified carbon paste electrode showed high electrocatalytic activity toward ascorbic acid;
the current was enhanced significantly relative to the situation prevailing when an unmodified
carbon paste electrode was used. Cyclic voltammetry was used to investigate the redox
properties of this modified electrode at various solution pH values and at various scan rates.
Using differential pulse voltammetry, the calibration curves for AA were obtained over the
range of 1.0–80.0 and 80–4000.0 μM, respectively. The detection limit was 0.3 μM. The present
method provides a simple method for selective detection of ascorbic acid. DPV also was used
for simultaneous determination of AA, uric acid, and tryptophan at the modified electrode.
Finally, the proposed electrochemical sensor was used for determinations of these substances in
in biological systems and pharmaceutical samples.
Keywords :
Carbon nanotube , Tryptophan , Uric Acid , Ascorbic acid , Sensor
