Electrochemical Detection of Bisphenol A Based on N-Doped Carbon Quantum Dots@Carbon Nanotubes Composite

2020 ◽  
Vol 20 (12) ◽  
pp. 7610-7617
Author(s):  
Zhongzhen Chen ◽  
Haiping Huang ◽  
Yanan Chen ◽  
Ying Ye ◽  
Shuzhen Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Quantum Dots ◽  
Bisphenol A ◽  
Differential Pulse Voltammetry ◽  
Electrochemical Detection ◽  
Glassy Carbon ◽  
Differential Pulse ◽  
Carbon Quantum Dots ◽  
Pulse Voltammetry

A novel nanocomposite of N-Doped Carbon Quantum Dots@Carbon Nanotubes was synthesized in this study for electrochemical detection of bisphenol A by differential pulse voltammetry. The nanocomposite was characterized by transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction and Fourier transform infrared spectroscopy. Electrochemical properties of the nanocomposite modified glassy carbon electrodes were studied via cyclic voltammetry. Differential pulse voltammetry experimental results showed that N-Doped Carbon Quantum Dots@Carbon Nanotubes/glassy carbon electrode exhibited excellent catalysis activity towards electrochemical oxidation of bisphenol A. The oxidation peak current was linearly increased with concentration of bisphenol A in the range from 0.4 μM to 40 μM, with a limit of detection of 65 nM.

scholarly journals Communication—Selective Electrochemical Detection of Catechin Compounds in Herbal Medicines

2022 ◽  
Author(s):  
Jéssica Santos Gomes ◽  
Érica Abadia Da Costa ◽  
Rodrigo A. A. Munoz ◽  
Alberto De Oliveira ◽  
Raquel M. F. Sousa
Keyword(s):  
Mass Spectrometry ◽  
Differential Pulse Voltammetry ◽  
Electrochemical Detection ◽  
Glassy Carbon ◽  
Electrochemical Sensors ◽  
Herbal Medicines ◽  
Differential Pulse ◽  
Stable Complex ◽  
Carbon Electrode ◽  
Pulse Voltammetry

Abstract Most electrochemical sensors reported for catechin determination in herbal medicines actually involve the detection of not only catechins but also other flavonoids. This work proposes a strategy to selectively detect and quantify flavan-3-ol, known as catechins, in the presence of other flavonoids by complexation with AlCl3. Flavonoids (e.g.,rutin, quercetin) form stable complex with AlCl3 which affect the electrooxidation of these molecules. Hence, the electrochemical oxidation of catechin is free from the interference of other flavonoids as shown by differential-pulse voltammetry using glassy-carbon electrode. The approach was applied to herbal medicines and mass-spectrometry confirmed the presence of catechins in such samples.

Ultrasensitive Electrochemical Determination of Phosphate in water by Hydrophilic TiO2 modified Glassy Carbon Electrodes

2021 ◽  
Author(s):  
Yan Jin ◽  
Tong QI ◽  
Yuqing Ge ◽  
Jin Chen ◽  
Li juan Liang ◽  
...  
Keyword(s):  
Differential Pulse Voltammetry ◽  
Glassy Carbon ◽  
Differential Pulse ◽  
Electrochemical Determination ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Time Differential ◽  
Pulse Voltammetry ◽  
First Time

In this paper, ultrasensitive electrochemical determination of phosphate in water is achieved by hydrophilic TiO2 modified glassy carbon electrodes for the first time. Differential pulse voltammetry (DPV) method is proposed...

Determination of chloramphenicol by differential pulse voltammetry at carbon paste electrodes – The use of sodium sulfite for removal of oxygen from electrode surface

2011 ◽  
Vol 76 (5) ◽  
pp. 383-397 ◽  
Author(s):  
Ferenc T. Pastor ◽  
Hana Dejmková ◽  
Jiří Zima ◽  
Jiří Barek
Keyword(s):  
Differential Pulse Voltammetry ◽  
Glassy Carbon ◽  
Sodium Sulfite ◽  
Differential Pulse ◽  
Optimal Conditions ◽  
Carbon Paste ◽  
Tricresyl Phosphate ◽  
Carbon Paste Electrodes ◽  
Pulse Voltammetry

The possibility of determination of chloramphenicol by differential pulse voltammetry at four different carbon paste electrodes, in the full pH range (2–12) of Britton–Robinson (BR) buffer was investigated. Electrodes were prepared by mixing spectroscopic graphite powder or glassy carbon microbeads with mineral oil (Nujol) or tricresyl phosphate. Under optimal conditions (BR buffer pH 12, the electrode prepared from glassy carbon microbeads and tricresyl phosphate), linear calibration graph was obtained only in 10–5 M chloramphenicol concentration range. Determination of lower concentrations of chloramphenicol was complicated by irreproducible peak of oxygen from the carbon paste which overlapped with peak of chloramphenicol. Addition of sodium sulfite removed the oxygen peak without influence on the peak of chloramphenicol. Under optimal conditions (electrode paste made from glassy carbon microbeads, BR buffer pH 10 and 0.5 M sodium sulfite), straight calibration line was obtained in the 10–6 and 10–5 M chloramphenicol concentration range. Limit of determination was 5 × 10–7 mol/l.

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