Aplicações forenses do Probe Electrospray Ionization Mass Spectrometry com filme de polipirrol

• Ano de defesa: 2017
• Autor(a) principal: Bernardo, Ricardo Alves
• Orientador(a): Chaves, Andréa Rodrigues
• Banca de defesa: Chaves, Andréa Rodrigues, Arruda, Andréa Fernandes, Duarte, Gabriela Rodrigues Mendes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Química (IQ)
• Departamento: Instituto de Química - IQ (RG)
• País: Brasil
• Palavras-chave em Português: Drogas ilícitas; Polipirrol; Microextração em fase sólida; Espectrometria de massas
• Palavras-chave em Inglês: Illicit drugs; Polypyrrole; Solid phase microextraction; Mass spectrometry
• Área do conhecimento CNPq: QUIMICA::QUIMICA ANALITICA
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/7668

In this study, we developed a solid phase microextraction (SPME) method to extract Cocaine, Lisergic Acid Diethylamide (LSD), Methamphetamine (MA) and [3,4 – Methylenedioxymethamphetamine] (MDMA), which allowed the direct analysis by MS in a Probe Electrospray Ionization Mass Spectrometry (PESI-MS). PPy fibers were deposited on a platinum wire. These fibers were subjected to drug extraction from biological fluids employing SPME principles. After that, the coated platinum wire was positioned in front of the MS and then a high voltage (HV) was applied on it. At the same time, methanol (formic acid 0,1%) was used to assist the analytes desorption, ionization, and detection. Parameters as number of cycles in electrochemical process, pH, temperature of extraction and matrix effect were evaluated. The coated PESI-MS method presented linearity in a concentration range from the limit of quantification (LOQ) to 500 ng.L-1 (ppb). The LOQ values ranged from 2 ng.L-1 to 10 ng.L-1. The interday precision presented values from 0.8 to 9.6% with accuracy ranging from -0.6 to 13.7%. The intraday precision obtained values varied from 1.7 to 10.8% with accuracy ranging from -2.4 to 14.0%. The absolute recovery was also evaluated and presented values from 97.6 to 114.0%. The proposed method is a promising alternative to fast sampling and analysis for avoiding laborious process, and for showing precision and accuracy according to the values proposed by ANVISA.