Application of thionine-nafion supported on multi-walled carbon nanotube for preparation of a modified electrode in simultaneous voltammetric detection of dopamine and ascorbic acid

2007 ◽  
Vol 52 (22) ◽  
pp. 6310-6317 ◽  
Author(s):  
Saeed Shahrokhian ◽  
Hamid Reza Zare-Mehrjardi
Keyword(s):  
Ascorbic Acid ◽  
Carbon Nanotube ◽  
Modified Electrode ◽  
Multi Walled Carbon Nanotube ◽  
Voltammetric Detection

Simultaneous determination of dopamine, ascorbic acid and uric acid using a multi-walled carbon nanotube and reduced graphene oxide hybrid functionalized by PAMAM and Au nanoparticles

2015 ◽  
Vol 7 (4) ◽  
pp. 1471-1477 ◽  
Author(s):  
Siyuan Wang ◽  
Wen Zhang ◽  
Xia Zhong ◽  
Yaqin Chai ◽  
Ruo Yuan
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Simultaneous Determination ◽  
Au Nanoparticles ◽  
Electrochemical Determination ◽  
Multi Walled Carbon Nanotube ◽  
Reduced Graphene

A nanohybrid (RGO–PAMAM–MWCNT–AuNPs) for simultaneous electrochemical determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA) was reported in this paper.

Selective Voltammetric Detection of Dopamine in the Presence of Ascorbic Acid at Poly(p-methoxyphenol)-Modified Electrode

2020 ◽  
Vol 18 (3) ◽  
pp. 222-226
Author(s):  
Gamze Erdoğdu
Keyword(s):  
Ascorbic Acid ◽  
Detection Limit ◽  
Modified Electrode ◽  
Oxidative Polymerization ◽  
Phosphate Buffer Solution ◽  
Relative Sensitivity ◽  
High Concentration ◽  
Buffer Solution ◽  
Solution Ph ◽  
Voltammetric Detection

A gold electrode was modified with electropolymerized films of p-methoxyphenol by its oxidative polymerization from an alkaline solution by cyclic voltammetry. The modified electrode was then used to determine dopamine (DA) in the presence of a high concentration of ascorbic acid (AA) by differential pulse voltammetry. The peak positions as well as relative sensitivity DA/AA were affected by the potential window used for the polymerization. For polymerization between 0 and 1.0 V, the peak potentials recorded in a phosphate buffer solution (pH = 7.2) were 516 and 312 mV versus Ag/AgCl for DA and AA, respectively. In addition to the effects of pH and the type of electrolyte on the linearity range and detection limit are investigated. The detection limit for 3s-test is 0.1 nM. The high selectivity and sensitivity for DA was found to be due to charge discrimination/analyte accumulation.

Polyaniline/polyacrylic acid/multi-walled carbon nanotube modified electrodes for sensing ascorbic acid

2012 ◽  
Vol 4 (1) ◽  
pp. 118-124 ◽  
Author(s):  
Ida Tiwari ◽  
Karan Pratap Singh ◽  
Manorama Singh ◽  
Craig E. Banks
Keyword(s):  
Ascorbic Acid ◽  
Carbon Nanotube ◽  
Polyacrylic Acid ◽  
Modified Electrodes ◽  
Multi Walled Carbon Nanotube
Sign in / Sign up

Export Citation Format

Share Document