Departamento de Química, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Campus JK, Diamantina, 39100000, Minas Gerais, Brazil. wallanst@ufvjm.edu.br.
2 papers in the library · 19 citations · publishing 2023-2024
A new electrochemical screening method using a multi-wall carbon nanotube screen-printed electrode combined with square wave voltammetry can detect LSD in forensic samples quickly and reliably. The method shows high stability, with less than 5% variation in measurements, a linear detection range from 0.16 to 40.0 μmol L-1, and a low detection limit of 0.05 μmol L-1. Tests with twenty-three other substances, including phenethylamines and other illicit drugs, demonstrate strong selectivity for LSD. This approach provides a sensitive, reproducible, and straightforward tool for preliminary identification of LSD in seized samples.
Discarded screen-printed electrodes can be recoated with a graphite and chitosan mixture to create a reusable sensor for detecting the recreational drug 2C-B in oral fluid and seized samples. The sensor, called SPE-Gr/CTS, detects 2C-B electrochemically with a linear range from 0.05 to 7.5 μmol L⁻¹ and a detection limit of 0.015 μmol L⁻¹. Responses are stable across different electrodes, with relative standard deviation below 5.0%. The method is selective for 2C-B even when seventeen other illicit drugs or adulterants are present. Real seized and oral fluid samples were analyzed, and results matched those from LC-MS. The device offers a rapid, portable, and environmentally friendly screening tool for forensic analysis, using only 50 μL of sample.