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Letícia Birk

4 papers in the library · 18 citations · publishing 2020-2026

Papers

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Shifting Patterns in Ecstasy Use: Increasing Detection of MDA in Forensic Seizures and Toxicological Cases in Southern Brazil

Journal of Psychoactive Drugs June 10, 2026 Bruno Pereira Dos Santos, Vítor Camargo Pôrto, Letícia Birk et al.

Ecstasy-type drugs are the most frequently seized synthetic drugs in Brazil, usually containing a mixture of MDMA and its analog MDA. In recent years, an increasing number of samples have been found to contain only MDA, possibly reflecting shifts in the synthetic routes of ecstasy-type substances during the COVID-19 pandemic. However, the exclusive use of MDA remains poorly characterized, and...

DOI: 10.1080/02791072.2026.2686365 (opens in new tab) Ecstasy MDMA Forensic toxicology Forensic science +7

A novel method for the determination of synthetic cathinones and related substances in postmortem blood samples using cork-based dispersive solid-phase microextraction prior to LC-MS/MS analysis.

Analytical and Bioanalytical Chemistry May 14, 2025 Letícia Birk, Bruno Pereira Dos Santos, Sarah Eller et al. 3 citations

The detection of new psychoactive substances in postmortem blood is of primary importance for the investigation of related deaths. A method using cork as a biosorbent in a solid-phase microextraction with LC-MS/MS analysis was developed and validated for the determination of synthetic cathinones and related substances in blood. The sample preparation method employed 200 µL of sample and 30 mg...

DOI: 10.1007/s00216-025-05907-y (opens in new tab) Full text (opens in new tab) Biosorbents Cork Lc-ms/ms New psychoactive substances +8

A simple method for the determination of stimulant substances in postmortem blood: development, validation, and application in nearly 1000 forensic cases.

Forensic Toxicology April 24, 2025 Letícia Birk, Bruno Pereira Dos Santos, Daniela Souza Ossanes et al. 2 citations

Toxicological analyses of postmortem blood samples are essential to elucidate forensic cases involving toxic agents, such as illicit drugs. A simple method for determining stimulant substances in postmortem blood samples through protein precipitation and liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed and applied in nearly 1000 samples from Brazilian forensic cases. For...

DOI: 10.1007/s11419-025-00725-4 (opens in new tab) Full text (opens in new tab) Blood Drugs of abuse Forensic cases Lc–ms/ms +5

A rapid analytical strategy for the determination of ayahuasca alkaloids in non-ritualistic approaches by UHPLC-MS/MS

Forensic Science International April 17, 2020 Sarah Eller, Gabriela Ramos Borges, Daniela Souza Ossanes et al. 13 citations

IntroductionAyahuasca is a beverage composed by a mixture of herbs which contain the compound N,N-dimethyltriptamine (DMT) and the β-carbolines. Although its use is legalized in Brazil only for religious and spiritual ceremonies, there is a growing black market specialized in the distribution of these compounds in form of herbal material through internet and mail. The purpose of this work was...

DOI: 10.1016/j.forsciint.2020.110298 (opens in new tab) Ayahuasca Harmine Harmaline Chromatography +1