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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Essential oil-based dispersive liquid-liquid microextraction for the determination of N,N-dimethyltryptamine and beta-carbolines in human plasma: A novel solvent-free alternative

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Author(s):
Silveira, Gabriela de Oliveira [1] ; Lourenco, Felipe Rebello [2] ; Fonseca Pego, Ana Miguel [3] ; dos Santos, Rafael Guimaraes [4, 5] ; Rossi, Giordano Novak [4] ; Hallak, Jaime E. C. [4, 5] ; Yonamine, Mauricio [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Sch Pharmaceut Sci, Dept Clin & Toxicol Anal, BR-05508000 Sao Paulo - Brazil
[2] Univ Sao Paulo, Sch Pharmaceut Sci, Dept Pharm, BR-05508000 Sao Paulo - Brazil
[3] Dutch Screening Grp, NL-6229 GS Maastricht - Netherlands
[4] Univ Sao Paulo, Dept Neurosci & Behav, BR-14049900 Ribeirao Preto - Brazil
[5] Natl Inst Sci & Technol Translat Med, BR-14049900 Ribeirao Preto - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Talanta; v. 225, APR 1 2021.
Web of Science Citations: 0
Abstract

The present study describes the development of a novel solvent-free vortex-assisted dispersive liquid-liquid microextraction alternative based on a natural essential oil as extracting solvent (VA-EO-DLLME) for the determination of N,N-dimethyltryptamine (DMT), harmine (HRM), harmaline (HRL) and tetrahydroarmine (THH) (compounds found in the ayahuasca tea, a psychedelic plant preparation) in human plasma. After optimization through full factorial and Box-Behnken experimental designs, this VA-EO-DLLME followed by ultrahigh performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) was completely validated and applied to authentic plasma specimens. Sample preparation consisted in the addition of 60 mg of NaCl, 100 mu L of borate buffer and 100 mu L of Eucalyptus globulus essential oil to a 200 mu L aliquot of human plasma. After 30 s of vortex agitation followed by 5 min of centrifugation (10,000 rpm), 80 mu L of the oil supernatant was dried and resuspended in mobile phase prior to injection into the UHPLC-MS/MS system. Once optimized, the validated method yielded LoDs <= 1.0 ng mL(-1) for all analytes. LoQ was 1.0 ng mL 1 for DMT, HRL and HRM and 2.0 ng mL(-1) for THH. The method has shown to be linear over the range of LoQ up to 150 ng mL(-1) (r(2) >= 0.9926). Intra/inter-day precision and accuracy met the acceptance criteria at three quality control (QC) levels. An additional intermediate precision study demonstrated that, except for THH and HRL at low and medium QCs, the overall method performance was similar for the three different oil sources. Matrix effect evaluation showed predominant ion suppression, ranging from 56% to 83%. Recovery varied from 33 up to 101% with an average of 50 +/- 15.8%. Selectivity studies showed no interferences. Analysis of 13 authentic samples proved method feasibility. Finally, we believe that our novel VA-EO-DLLME approach offers a very simple, fast, cost-effective and eco-friendly alternative based on the use of an easily accessible and entirely green material as an extracting solvent. This may represent an incentive for researchers to investigate novel and creative alternatives, such as essential oils, as substitutes of organic solvents for microextraction methods in forensic and clinical contexts. (AU)

FAPESP's process: 18/24770-3 - Development of analytical methods for the determination of ayahuasca alkaloids in different matrices applying green analytical chemistry strategies
Grantee:Mauricio Yonamine
Support type: Regular Research Grants
FAPESP's process: 16/06810-2 - Development of analytical methods for the determination of ayahuasca alkaloids in different matrices applying green analytical chemistry strategies
Grantee:Gabriela de Oliveira Silveira
Support type: Scholarships in Brazil - Doctorate