Determination of scopolamine and butylscopolamine in beverages, urine and Buscopan® tablets samples using electrophoresis microchip with integrated contactless conductivity detection.

Autor: Santos HI; Instituto de Química, Universidade Federal de Goiás, 74690-900, Goiânia, GO, Brazil., Pinheiro KMP; Instituto de Química, Universidade Federal de Goiás, 74690-900, Goiânia, GO, Brazil., Richter EM; Instituto de Química, Universidade Federal de Uberlândia, 38408-100, Uberlândia, MG, Brazil; Instituto Nacional de Ciência e Tecnologia de Bioanalítica, 13084-971, Campinas, SP, Brazil., Coltro WKT; Instituto de Química, Universidade Federal de Goiás, 74690-900, Goiânia, GO, Brazil; Instituto Nacional de Ciência e Tecnologia de Bioanalítica, 13084-971, Campinas, SP, Brazil. Electronic address: wendell@ufg.br.
Jazyk: angličtina
Zdroj: Talanta [Talanta] 2024 Jan 01; Vol. 266 (Pt 1), pp. 124960. Date of Electronic Publication: 2023 Jul 17.
DOI: 10.1016/j.talanta.2023.124960
Abstrakt: The number of cases in which scopolamine (SCO) was used for both recreational and predatory purposes has increased dramatically in recent decades. Linked to this, there is a concern about obtaining SCO through thermal degradation of butylscopolamine (BSCO) - an active ingredient of Buscopan® - a drug sold without a medical prescription. In this study, mixtures containing SCO and BSCO were separated and detected on a microchip electrophoresis (ME) device with integrated capacitively coupled contactless conductivity detection (C 4 D) using a running buffer composed of 40 mmol L -1 of butyric acid and 25 mmol L -1 of sodium hydroxide (pH 5.0). The separation was performed within ca. 115 s with a resolution of 1.3 and separation efficiency ranging from 1.4 × 10 5 to 1.5 × 10 5 theoretical plates m -1 . A detection limit of 1.1 μmol L -1 was achieved for both species and the developed method revealed satisfactory repeatability with relative standard deviation (RSD) values for forty-eight injections between 4.8 and 9.4% for peak areas and lower than 3.3% for migration times. Furthermore, inter-day precision was evaluated for sixteen injections (a sequence of four injections performed over four days), and RSD values were less than 6.6% for peak areas and 2.2% for migration times. Satisfactory recovery values (95-114%) were obtained for all evaluated beverage samples (cachaça, vodka, whiskey, beer, Coca-Cola, and grape juice) as well as for artificial urine samples (95-107%). Finally, the conversion of BSCO into SCO was observed after simple heating procedure of Buscopan® sample (not subject to medical prescription), which was successfully confirmed through analysis by capillary electrophoresis coupled to the mass spectrometry (CE-MS). Based on the reported results, the use of ME-C 4 D devices has demonstrated a huge potential for applications in the forensic chemistry field.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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