scholarly journals A novel sensing platform based on Polyglycine-Modified CVD Graphene for the Simultaneous Determination of Dopamine, Uric Acid, Guanine and Adenine

2020 ◽  
pp. 11387-11400
Author(s):  
Yitao Zhang ◽  
Keyword(s):  
Uric Acid ◽  
Simultaneous Determination ◽  
Cvd Graphene ◽  
Sensing Platform ◽  
Guanine And Adenine

Graphene nanosheets as a sensing platform for amplified electrochemical measurement of quercetin and uric acid in biological fluids

2014 ◽  
Vol 92 (11) ◽  
pp. 1074-1080 ◽  
Author(s):  
Majid Arvand ◽  
Mohsen Anvari
Keyword(s):  
Uric Acid ◽  
Simultaneous Determination ◽  
Graphene Nanosheets ◽  
Biological Fluids ◽  
Aqueous Media ◽  
Buffer Solution ◽  
Solution Ph ◽  
Citrate Buffer ◽  
Sensing Platform

A simple and selective electrochemical method was investigated for the simultaneous determination of quercetin (Qu) and uric acid (UA) in aqueous media (citrate buffer solution, pH 4.0) on a glassy carbon electrode modified with graphene nanosheets as a sensing platform (GNSs/GCE). Cyclic voltammetry, transmission electron microscopy, and Fourier transform infrared spectroscopy were employed to characterize the nanostructure of the sensor. Separation of the oxidation peak potentials for Qu and UA was about 160 mV, and the anodic currents for the oxidation of both Qu and UA are greatly increased at GNSs/GCE, which makes it suitable for simultaneous determination of these compounds. The detection limits were 0.0011 and 0.0137 μmol/L for Qu and UA, respectively. The method was applied to the determination of Qu and UA in human blood serum and urine samples.

CVD graphene incorporating polymerized l-cysteine as an electrochemical sensing platform for simultaneous determination of dopamine and ascorbic acid

2017 ◽  
Vol 9 (47) ◽  
pp. 6689-6697 ◽  
Author(s):  
Danyu He ◽  
Shehong Li ◽  
Pu Zhang ◽  
Hongxia Luo
Keyword(s):  
Ascorbic Acid ◽  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Electrochemical Sensing ◽  
Cvd Graphene ◽  
Sensing Platform

A novel electrochemical sensor based on a poly-l-cysteine/graphene platform was developed for the simultaneous determination of dopamine and ascorbic acid.

Simultaneous determination of guanine and adenine in the presence of uric acid by a poly(para toluene sulfonic acid) mediated electrochemical sensor in alkaline medium

RSC Advances ◽  
2016 ◽  
Vol 6 (79) ◽  
pp. 75741-75748 ◽  
Author(s):  
S. Jesny ◽  
Shalini Menon ◽  
K. Girish Kumar
Keyword(s):  
Uric Acid ◽  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Alkaline Medium ◽  
Sulfonic Acid ◽  
Toluene Sulfonic Acid ◽  
Polymer Modified Electrode ◽  
Guanine And Adenine ◽  
Simultaneous Sensing

Simultaneous sensing of guanine and adenine in presence of uric acid in alkaline medium by polymer modified electrode.

scholarly journals Simultaneous Determination of Uric Acid and Xanthine Using a Poly(Methylene Blue) and Electrochemically Reduced Graphene Oxide Composite Film Modified Electrode

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Gen Liu ◽  
Wei Ma ◽  
Yan Luo ◽  
Deng-ming Sun ◽  
Shuang Shao
Keyword(s):  
Methylene Blue ◽  
Uric Acid ◽  
Graphene Oxide ◽  
Composite Film ◽  
Simultaneous Determination ◽  
Reduced Graphene Oxide ◽  
Modified Electrode ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

Poly(methylene blue) and electrochemically reduced graphene oxide composite film modified electrode (PMB-ERGO/GCE) was successfully fabricated by electropolymerization and was used for simultaneous determination of uric acid (UA) and xanthine (Xa). Based on the excellent electrocatalytic activity of PMB-ERGO/GCE, the electrochemical behaviors of UA and Xa were studied by cyclic voltammetry (CV) and square wave voltammetry (SWV). Two anodic sensitive peaks at 0.630 V (versus Ag/AgCl) for UA and 1.006 V (versus Ag/AgCl) for Xa were given by CV in pH 3.0 phosphate buffer. The calibration curves for UA and Xa were obtained in the range of 8.00 × 10−8~4.00 × 10−4 M and 1.00 × 10−7~4.00 × 10−4 M, respectively, by SWV. The detection limits for UA and Xa were3.00×10-8 M and5.00×10-8 M, respectively. Finally, the proposed method was applied to simultaneously determine UA and Xa in human urine with good selectivity and high sensitivity.

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