scholarly journals Square wave voltammetry at carbon paste electrode modified with surfactant for alpha tocopheryl acetate determination in cosmetics

10.5219/881 ◽  
2018 ◽  
Vol 12 (1) ◽  
Author(s):  
Simona Žabčíková ◽  
Arlinda Nallbani ◽  
Milan Sýs ◽  
Tomáš Mikysek ◽  
Libor Červenka
Keyword(s):  
Carbon Paste Electrode ◽  
Square Wave Voltammetry ◽  
Tocopheryl Acetate ◽  
Carbon Paste ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Paste Electrode

scholarly journals A simple and fast method to detect freebase cocaine in artificial saliva by square wave voltammetry (SWV) using carbon paste electrode

2020 ◽  
Vol 10 (4) ◽  
pp. 361-371
Author(s):  
Bruno Ferreira ◽  
Leandro Oka Duarte ◽  
Érica Naomi Oiye ◽  
Maria Fernanda Muzetti Ribeiro ◽  
Juliana Midori Toia Katayama ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Square Wave Voltammetry ◽  
Limit Of Detection ◽  
Artificial Saliva ◽  
Fast Method ◽  
Carbon Paste ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Analytical Curve ◽  
Paste Electrode

The consequences of consuming and commercializing illicit drugs including cocaine, con­stitute a serious problem for authorities and the whole society. Cocaine is usually identified in the laboratory conditions by chromatographic or spectroscopic methods. Electro­che­mical techniques have also gained prominence because they are fast and easy to use, have many applications, and provide reproducible and reliable results. Therefore, in the present study, a voltammetric method was developed to detect freebase cocaine using carbon paste electrode and methanol as the main cocaine solvent. The developed method was applied to detect cocaine in the artificial saliva by the square wave voltammetry (SWV). The current values increased linearly with the concentration of cocaine, which afforded construction of the analytical curve. The limit of detection (LoD) and the limit of quantify­cation (LoQ) were determined as 0.90 µg/mL and 2.41 µg/mL, respectively. For compa­rison purposes, HPLC-DAD chromatographic method was also applied to detect cocaine. The corresponding analytical curve gave LoD = 0.043 µg/mL and LoQ = 0.130 µg/mL. Although showing better analytical results, HPLC-DAD method could not detect cocaine in saliva samples without previous treatment, what makes the electrochemical method much more attractive for this type of detection.

scholarly journals Analysis of sulfamethoxazole by square wave voltammetry using new carbon paste electrode

2018 ◽  
Vol 8 (4) ◽  
pp. 281-289
Author(s):  
Izabel Cristina Eleotério ◽  
Marco Aantonio Balbino ◽  
José Fernando De Andrade ◽  
Bruno Ferreira ◽  
Adelir Aparecida Saczk ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Veterinary Medicine ◽  
Carbon Paste Electrode ◽  
Square Wave Voltammetry ◽  
Carbon Paste ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Analytical Curve ◽  
Paste Electrode ◽  
Detection And Quantification

In this work a new model of carbon paste electrode was employed to determine sulfamethoxazole (SMX), an antibiotic used to treat infections in human and veterinary medicine, by the square wave voltammetric modality (SWV). More specifically, the elec­trochemical behavior of SMX was investigated by cyclic voltammetry (CV), and the quantitative analysis of SMX was provided by SWV. The analytical curve was obtained with a linear correlation coefficient (r) of 0.985 and standard deviation (SD) of 0.005 μA. Limits of detection and quantification were found as 2.3×10-6 and 7.7×10-6 mol L-1, respectively. According to the obtained results, the new carbon paste prototype electrode can successfully be employed in this kind of electroanalytical applications.

scholarly journals Analysis of sulfamethoxazole by square wave voltammetry using new carbon paste electrode

2018 ◽  
Author(s):  
Izabel Cristina Eleotério ◽  
Marco Aantonio Balbino ◽  
José Fernando De Andrade ◽  
Bruno Ferreira ◽  
Adelir Aparecida Saczk ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Veterinary Medicine ◽  
Carbon Paste Electrode ◽  
Square Wave Voltammetry ◽  
Carbon Paste ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Analytical Curve ◽  
Paste Electrode ◽  
Detection And Quantification

<p class="PaperAbstract"><span lang="EN-US">In this work a new model of carbon paste electrode was employed to determine sulfamethoxazole (SMX), an antibiotic used to treat infections in human and veterinary medicine, by the square wave voltammetric modality (SWV). More specifically, the elec­trochemical behavior of SMX was investigated by cyclic voltammetry (CV), and the quantitative analysis of SMX was provided by SWV. The analytical curve was obtained with a linear correlation coefficient (r) of 0.985 and standard deviation (SD) of 0.005 μA. Limits of detection and quantification were found as 2.3</span><a name="_Hlk512068463"></a><span lang="EN-US">×</span><span lang="EN-US">10<sup>-6</sup> and 7.7</span><span lang="EN-US">×</span><span lang="EN-US">10<sup>-6</sup> mol L<sup>-1</sup>, respectively. According to the obtained results, the new carbon paste prototype electrode can successfully be employed in this kind of electroanalytical applications.</span></p>

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