Voltammetric analysis of cocaine using platinum and glassy carbon electrodes chemically modified with Uranyl Schiff base films

Oliveira, Laura Siqueira de; Balbino, Marco Antônio; Menezes, Matheus Manoel Teles de; Dockal, Edward R.; Oliveira, Marcelo Firmino de

doi:10.1016/j.microc.2013.04.017

Cited by 57 publications

(34 citation statements)

References 21 publications

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“…However, interferences from substances which oxidise at potentials close to that observed for cocaine make the analysis more difficult. This difficulty has sometimes been solved by the modification of the working electrode with polymers, Schiff bases, or biomolecules which increase the sensitivity and provide selectivity to the electrochemical system (Table 1) [29][30][31][32][33][34][35][36][37]. Comparing the analytical parameters with those previously reported in the literature (see Table 1), it is clearly seen that the use of the PANI-β-CD/ fMWCNT film leads, in most cases, to comparable limits of detection.…”

Section: Analytical Applicationmentioning

confidence: 91%

Carbon nanotube β-cyclodextrin-modified electrode for quantification of cocaine in seized street samples

Garrido

Borges

Brett

et al. 2016

Ionics

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Detection and quantification of cocaine is a key tool in fields such as police apprehensions and the fight against drug trafficking. Thus, a simple, fast and inexpensive electroanalytical methodology for the determination of cocaine in seized street samples has been developed, employing linear sweep voltammetry. The method is based on the use of a glassy carbon (GC) electrode modified by a combination of multi-walled carbon nanotubes (MWCNT) with β-cyclodextrin (β-CD) incorporated in a polyaniline film. The proposed method shows high reproducibility, repeatability and specificity. Under optimal conditions, the β-CD/ MWCNT-modified GC electrode gives a detection limit of 1.02 μM cocaine. The results obtained are in good agreement with those obtained by the high-performance liquid chromatography reference method. The new methodology proposed has excellent potential as the basis of a portable analytical sensor for on-site screening of cocaine in seized street samples.

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Section: Analytical Applicationmentioning

confidence: 91%

Carbon nanotube β-cyclodextrin-modified electrode for quantification of cocaine in seized street samples

Garrido

Borges

Brett

et al. 2016

Ionics

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“…complexes with Schiff bases of the Salen type can efficiently detect cocaine and have potential application in the forensic context [34][35][36] 38 , and its structure can be seen in Figure 1. All the voltammetric measurements were performed in triplicates in a room under incandescent light, at a fixed temperature of 24 °C.…”

Section: Recent Work By Our Research Group Have Demonstrated That Urmentioning

confidence: 99%

Voltammetric Determination of LSD with a Schiff Base – Chemically Modified Electrode in Aqueous Solution

Ribeiro¹,

Oiye²,

Katayama³

et al. 2020

BJFS

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In recent years, practical, inexpensive, and highly specific electroanalytical methods based on modified electrodes have been increasingly developed for forensic science. Simple modification of the carbon paste electrode with Schiff base complexes has become a promising strategy to detect and quantify narcotics. In this context, we aimed to develop voltammetric methods to quantify lysergic acid diethylamide (LSD) by using a carbon paste electrode modified with the complex [UO2(Ac-ophen)]·H2O. The use of an aqueous solution of KCl as supporting electrolyte makes the methodology less polluting, which contrasts with methods that still employ toxic solvents. The developed method for Differential Pulse Voltammetry provides a linear response at various concentrations of LSD and affords analytical curves with standard deviation, detection, and quantification limits around 2.45, 0.625, and 2.08 μmol L-1, respectively. The recovery values of 103 and 108% prove that the developed method is suitable for application in forensic science.

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“…The literature contains descriptions of many methods for analysis of cocaine [8][9][10][11][12][13][14][15][16][17][18][19][20] and its metabolites 10,12,14,18,19,21 . The reported methods have advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Determination of Cocaine by Square Wave Voltammetry with Carbon Paste Electrodes

Oliva¹,

Katayama²,

Oiye³

et al. 2019

BJFS

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We compare the electrochemical behavior of cocaine hydrochloride (in acidic medium) and its free base form (in acetonitrile) by a simple, cheap, and fast square wave voltammetry method for cocaine analysis based on carbon paste electrodes without chemical modification. The electrodes performed better than the electrodes obtained for analysis on commercial screen-printed electrodes, which we also tested here. We conducted the analyses in aqueous solution containing 0.1 mol•L-1 NH4ClO4 as supporting electrolyte. For cocaine in acidic medium, the linear correlation coefficient, the LOD, and the LOQ were 0.996, 4.66 10-6 mol•L-1 , and 1.55 10-5 mol•L-1 , respectively. For cocaine in acetonitrile medium, the linear correlation coefficient, the LOD, and the LOQ were 0.994, 9.77 10-6 mol•L-1 , and 3.26 10-5 mol•L-1 , respectively. The specificity of the methodology is advantageous when the response of different interfering substances analyzed in this work (lidocaine, procaine, caffeine and phenacetine) is concerned.

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Voltammetric analysis of cocaine using platinum and glassy carbon electrodes chemically modified with Uranyl Schiff base films

Cited by 57 publications

References 21 publications

Carbon nanotube β-cyclodextrin-modified electrode for quantification of cocaine in seized street samples

Carbon nanotube β-cyclodextrin-modified electrode for quantification of cocaine in seized street samples

Voltammetric Determination of LSD with a Schiff Base – Chemically Modified Electrode in Aqueous Solution

Determination of Cocaine by Square Wave Voltammetry with Carbon Paste Electrodes

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