Electrochemically Recognizing Tryptophan Enantiomers based on Carbon Black/Poly-l-Cysteine Modified Electrode

A new, highly sensitive Adsorptive Stripping Voltammetric method for levodopa determination was developed. As a working electrode, the glassy carbon electrode (GCE) modified with carbon black (CB), RuO2·xH2O (RuO2) and Nafion was used (CB-RuO2-Nafion GCE). Levodopa signal obtained on the modified electrode was 12 times higher compared to GCE. During research, instrumental parameters were optimized: sampling time ts = 10 ms, waiting time tw = 10 ms, step potential Es = 5 mV and pulse amplitude ΔE = 50 mV. Preconcentration potential Eprec was equal to 0 mV. The best results were obtained in 0.025 M perchloric acid (approx. pH 1.4). Signal repeatability measured on the CB-RuO2-Nafion modified electrode for 0.2 µM of levodopa was equal to 2.1% (levodopa concentration 1 µM, n = 5). Linearity of the method was achieved in the concentration range from 1 to 8 µM. Limit of detection was equal to 17 nM. Recoveries calculated for pharmaceutical products and tap water measurements were in the range 102–105%, which confirms the accuracy of the developed. The applicability of the method was confirmed by analysis of pharmaceutical products and tap water samples. Based on obtained results, it might be concluded that the developed voltammetric method could be a useful tool in routine drug analysis.

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The use of modified electrode with carbon black as sensor to the electrochemical studies and voltammetric determination of pesticide mesotrione

Microchemical Journal ◽

10.1016/j.microc.2017.03.024 ◽

2017 ◽

Vol 133 ◽

pp. 188-194 ◽

Cited By ~ 21

Author(s):

Patrícia Batista Deroco ◽

Bruna Cláudia Lourencao ◽

Orlando Fatibello-Filho

Keyword(s):

Carbon Black ◽

Modified Electrode ◽

Voltammetric Determination ◽

Electrochemical Studies

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Chiral Recognition of Tryptophan Enantiomers Based on β-Cyclodextrin-platinum Nanoparticles/Graphene Nanohybrids Modified Electrode

Electroanalysis ◽

10.1002/elan.201500548 ◽

2015 ◽

Vol 28 (4) ◽

pp. 868-873 ◽

Cited By ~ 35

Author(s):

Juanjuan Xu ◽

Qinghong Wang ◽

Chunzhi Xuan ◽

Qiao Xia ◽

Xia Lin ◽

...

Keyword(s):

Modified Electrode ◽

Platinum Nanoparticles ◽

Chiral Recognition ◽

Tryptophan Enantiomers

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Electroanalytical Determination of Vancomycin at a Graphene‐modified Electrode: Comparison of Electrochemical Property between Graphene, Carbon Nanotube, and Carbon Black

Electroanalysis ◽

10.1002/elan.201800497 ◽

2018 ◽

Vol 31 (7) ◽

pp. 1224-1228 ◽

Cited By ~ 3

Author(s):

Mojtaba Hadi ◽

Tahere Mollaei

Keyword(s):

Carbon Nanotube ◽

Carbon Black ◽

Modified Electrode ◽

Electrochemical Property

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Selective and low potential electrocatalytic oxidation and sensing of l-cysteine using metal impurity containing carbon black modified electrode

Analytical Methods ◽

10.1039/c7ay02251d ◽

2017 ◽

Vol 9 (48) ◽

pp. 6791-6800 ◽

Cited By ~ 9

Author(s):

Sundaram Sornambikai ◽

Mohammed Rafiq Abdul Kadir ◽

Annamalai Senthil Kumar ◽

Nagamony Ponpandian ◽

Chinnuswamy Viswanathan

Keyword(s):

Carbon Black ◽

Functional Groups ◽

Modified Electrode ◽

Electrocatalytic Oxidation ◽

Metal Impurity ◽

Metal Impurities ◽

Oxygen Functional Groups

Cartoon for the GCE/CB modified electrode preparation and its low potential electrocatalytic oxidation of l-CySH with assistance of metal impurities and oxygen functional groups.

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