Electrochemical detection of cocaine metabolites (benzoylecgonine and ecgonine) at the miniaturized electrified liquid-liquid interface

Borgul, Paulina; Sobczak, Karolina; Rizwan, Mohammad; Kowalski, Grzegorz; Poltorak, Michal; Banatkiewicz, Pawel; Walecka, Irena; Rudnicki, Konrad; Skrzypek, Sławomira; Poltorak, Lukasz

doi:10.1016/j.snb.2024.135895

Sensors and Actuators B: Chemical

2024

DOI: 10.1016/j.snb.2024.135895

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Electrochemical detection of cocaine metabolites (benzoylecgonine and ecgonine) at the miniaturized electrified liquid-liquid interface

Paulina Borgul,

Karolina Sobczak,

Mohammad Rizwan

et al.

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Cited by 2 publications

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Innovative Surface Plasmon Resonance Aptasensor for Detecting Cocaine in Human Urine

Keklik Şah,

Isbir Turan

2024

Analytica

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This study describes the development of an optical-based surface plasmon resonance (SPR) aptasensor for the detection of cocaine. The aptasensor was prepared by first attaching gold nanoparticles to a clean SPR chip surface, followed by the addition of an aptamer to create a modified surface. This surface was characterized using contact angle and atomic force microscopy, revealing surface roughness values of 0.28 nm and 28.12 nm for the blank and modified surfaces, respectively. The detection of cocaine was carried out in the concentration range of 1 ng/mL to 1000 ng/mL, with a detection time of approximately 8 min and a cocaine limit of detection (LOD) of 0.43 ng/mL. Repeatability studies were conducted, and the stability of the signal response was examined at a concentration of 200 ng/mL. Adsorption isotherm models, including Scatchard, Langmuir, and Freundlich models, were calculated to assess the surface homogeneity of the SPR aptasensor chip, with the results indicating compatibility with the Langmuir isotherm model.

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Innovative Surface Plasmon Resonance Aptasensor for Detecting Cocaine in Human Urine

Keklik Şah,

Isbir Turan

2024

Analytica

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Cinética de la transferencia de los cationes TMA+ y TEA+ a través de la interfase agua|1,2-dicloroetano modificada con L-α-fosfatidilcolina

Canseco,

Amador-Hernández,

Velázquez-Manzanares

2024

S. F. J. of Dev.

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En este trabajo se estudió la influencia del lípido L-α-fosfatidilcolina en la transferencia de los cationes TMA+ y TEA+ a través de la interfase formada entre dos líquidos inmiscibles. En un sistema electroquímico basado en una celda de cuatro electrodos, se aplicaron las técnicas de voltamperometría cíclica y espectroscopía de impedancia electroquímica. Se determinaron los potenciales de onda media de ambos cationes, mismos que se compararon con valores previamente publicados sin la presencia del lípido; también se estudió la cinética de transferencia con la interfase modificada y sin modificar. En base a estos experimentos, se encontró que la monocapa formada por las diferentes concentraciones (10-30 mM) de PC causa un efecto en el desfasamiento del potencial de transferencia a valores menos positivos, con lo cual se deduce que una barrera más hidrofóbica induce un efecto en el cambio de la energía de transferencia de estos cationes. Por otro lado, la monocapa del lípido disminuye la constante de velocidad de transferencia en función de la concentración de éste.

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Electrochemical detection of cocaine metabolites (benzoylecgonine and ecgonine) at the miniaturized electrified liquid-liquid interface

Cited by 2 publications

References 45 publications

Innovative Surface Plasmon Resonance Aptasensor for Detecting Cocaine in Human Urine

Innovative Surface Plasmon Resonance Aptasensor for Detecting Cocaine in Human Urine

Cinética de la transferencia de los cationes TMA+ y TEA+ a través de la interfase agua|1,2-dicloroetano modificada con L-α-fosfatidilcolina

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