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Development of electroanalytical methods for detection/discrimination of drugs of abuse, its adulterants and explosives in forensic samples

Grant number: 11/19903-5
Support type:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): February 01, 2012
Effective date (End): March 31, 2016
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
Principal Investigator:Thiago Regis Longo Cesar da Paixão
Grantee:William Reis de Araujo
Home Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated scholarship(s):14/00788-0 - Development of electrochemical sensors for detection and discrimination of forensic samples, BE.EP.DD


Electrochemical techniques have been received increasing attention in the forensic field and for monitoring different chemical species. Hence, this research project focused on developing analytical methods for the quantification/discrimination of abuse drugs in biological fluids, specifically in urine using chemically modified electrodes and techniques of paper chromatography with electrochemical detection. The process of discrimination is performed using voltammetric electronic tongues, that is, a set of non-specific voltammetric sensors with low selectivity but high sensitivity associated with unsupervised pattern recognition methods to process the information for the discrimination. The development of these devices can result in greater flexibility in the process of discrimination of the doping process. Nowadays, this control requires several preparation steps and requiring large time between the analysis sample and the solution of the case. Additionally, these techniques require well-trained and expensive equipment. For this reason, it is interesting to develop new rapid analytical methods, which provide accurate and analysis "in situ" of these biological matrices, such as urine. (AU)

News published in Agência FAPESP Newsletter about the scholarship:
Researchers develop paper sensors to detect explosives  

Scientific publications (10)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DA SILVA, GABRIELA O.; DE ARAUJO, WILLIAM R.; PAIXAO, THIAGO R. L. C. Portable and low-cost colorimetric office paper-based device for phenacetin detection in seized cocaine samples. Talanta, v. 176, p. 674-678, JAN 1 2018. Web of Science Citations: 12.
SILVA, THALITA G.; DE ARAUJO, WILLIAM R.; MUNOZ, RODRIGO A. A.; RICHTER, EDUARDO M.; SANTANA, MARIO H. P.; COLTRO, WENDELL K. T.; PAIXAO, THIAGO R. L. C. Simple and Sensitive Paper-Based Device Coupling Electrochemical Sample Pretreatment and Colorimetric Detection. Analytical Chemistry, v. 88, n. 10, p. 5145-5151, MAY 17 2016. Web of Science Citations: 27.
SALLES, MAIARA O.; ARAUJO, WILLIAM R.; PAIXAO, THIAGO R. L. C. Development of a Molecularly Imprinted Modified Electrode to Evaluate Phenacetin Based on the Preconcentration of Acetaminophen. Journal of the Brazilian Chemical Society, v. 27, n. 1, p. 54-61, JAN 2016. Web of Science Citations: 6.
DE ARAUJO, WILLIAM R.; MALDANER, ADRIANO O.; COSTA, JOSE L.; PAIXAO, THIAGO R. L. C. Development of an electroanalytical method for the quantification of aminopyrine in seized cocaine samples. Microchemical Journal, v. 121, p. 213-218, JUL 2015. Web of Science Citations: 7.
GUIMARAES SELVA, THIAGO MATHEUS; DE ARAUJO, WILLIAM REIS; LONGO CESAR DA PAIXAO, THIAGO REGIS. Non-Invasive Salivary Electrochemical Quantification of Paraquat Poisoning Using Boron Doped Diamond Electrode. Electroanalysis, v. 27, n. 7, p. 1642-1648, JUL 2015. Web of Science Citations: 7.
DE ARAUJO, WILLIAM R.; PAIXAO, THIAGO R.L.C. Use of copper electrode for melamine quantification in milk. Electrochimica Acta, v. 117, p. 379-384, JAN 20 2014. Web of Science Citations: 14.
DE ARAUJO, W. R.; PAIXAO, T. R. L. C. Fabrication of disposable electrochemical devices using silver ink and office paper. ANALYST, v. 139, n. 11, p. 2742-2747, 2014. Web of Science Citations: 35.
SALLES, M. O.; MELONI, G. N.; DE ARAUJO, W. R.; PAIXAO, T. R. L. C. Explosive colorimetric discrimination using a smartphone, paper device and chemometrical approach. ANALYTICAL METHODS, v. 6, n. 7, p. 2047-2052, 2014. Web of Science Citations: 50.
JUNQUEIRA, JOAO R. C.; DE ARAUJO, WILLIAM R.; SALLES, MAIARA O.; PAIXAO, THIAGO R. L. C. Flow injection analysis of picric acid explosive using a copper electrode as electrochemical detector. Talanta, v. 104, p. 162-168, JAN 30 2013. Web of Science Citations: 32.
DE ARAUJO, WILLIAM R.; SALLES, MAIARA O.; PAIXAO, THIAGO R. L. C. Development of an enzymeless electroanalytical method for the indirect detection of creatinine in urine samples. SENSORS AND ACTUATORS B-CHEMICAL, v. 173, p. 847-851, OCT 2012. Web of Science Citations: 24.

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