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Vol. 207, Issue 12, December 2016, pp. 73-78




Electrochemical Study of Delta-9-Tetrahydrocannabinol by Cyclic Voltammetry Using Screen Printed Electrode,
Improvements in Forensic Analysis

1, 2 Marco Antonio BALBINO, 1, 2 Izabel Cristina ELEOTERIO, 1 Marcelo Firmino de OLIVEIRA and 2 Bruce Royston McCORD

1 Departamento de Química, Grupo de Estudos em Eletroquímica e Química Forense, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, USP, Ribeirão Preto, SP 14040-901, Brazil
2 Department of Chemistry and Biochemistry, Florida International University, 11200 SW
8th Street, Miami, FL 33199, United States
2 Tel.: +1 305 348 7543, fax: +1 305 348 377

2 E-mail: mccordb@fiu.edu


Received: 5 November 2016 /Accepted: 5 December 2016 /Published: 30 December 2016

Digital Sensors and Sensor Sysstems


Abstract: Rapid screening of seized drugs is a continuing problem for governmental laboratories and customs agents. Recently new and cheaper methods based on electrochemical sensing have been developed for the detection of illicit drugs. Screen printed electrodes are particularly useful in this regard and can provide excellent sensitivity. In this study, a carbon screen printed electrode for the voltammetric analysis of D9-THC was developed. The analysis was performed using cyclic voltammetry with 0.15 mol×L-1 potassium nitrate as a supporting electrolyte. In the analysis, a  D9-THC standard solution was added to the surface electrode by a drop coating method. A study of scan rate, time of pre-concentration, and concentration influence parameters showed versatility during the investigation. The high sensitivity, quantitative capability and low limit of detection (1.0 µmol×L-1) demonstrate that this electrochemical method should be an attractive alternative in forensic investigations of seized samples.


Keywords: Detection, Cyclic voltammetry, Screen printed electrodes, Delta-9-tetrahydrocannabinol, Versatility.


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