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In vitro antiplasmodial activity, targeted LC–MS metabolite profiling, and identification of major natural products in the bioactive extracts of Palicourea and Psychotria species from the Amazonia and Atlantic Forest biomes, Brazil

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Abstract

Introduction

A great variety of bioactive natural products has been reported for different Palicourea and Psychotria species (Rubiaceae). However, few of them as well as few of species of these botanical genera have been evaluated for antiplasmodial activity.

Objective

To assess the antiplasmodial activity of 24 extracts from Palicourea and Psychotria genera, along with the targeted LC–MS metabolite profiling, as well as identification of the main metabolites in the bioactive extracts.

Methods

Twenty four ethanol and acid–base extracts from Palicourea and Psychotria genera collected in the Amazonia and Atlantic Forest, Brazil, were evaluated against chloroquine-resistant Plasmodium falciparum W2 strain by PfLDH. The metabolite profiling and putative identification of metabolites from bioactive extracts were determined by LC-DAD-ESI–MS and LC-HRMS, respectively.

Results

The ethanol extracts disclosed low antiplasmodial activity (% GI < 50%). High antiplasmodial effect was observed for the acid–base extracts from Psychotria apoda and Psychotria colorata with 100% inhibition of parasite growth inhibition. Fragment ions related to pyrrolidinoindoline alkaloids were observed by LC-DAD-ESI–MS mainly in the most bioactive extracts. The results of the in vitro screening associated with the LC-DAD-ESI–MS and LC-HRMSn data allowed to predict, for the first time, the pyrrolidinoindoline alkaloids as possible antiplasmodial representing, then, new potential natural antimalarial hits. In addition, other metabolite classes such as flavanones, lignans and chalcones were also putatively identified in the bioactive extracts of Psychotria apoda, Psychotria capitata, and Psychotria poeppigiana.

Conclusion

The present results point to Palicourea and Psychotria species as sources of new antimalarial hits.

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Acknowledgements

To the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – CAPES for Postdoctoral fellowship to DCG and to Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq for Senior Research fellowship to ABO. To the CRTI – Centro Regional para o Desenvolvimento Tecnológico e Inovação, UFG, on behalf of Prof. CMA Oliveira, for LC-HRMSn data aquisition.

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Authors and Affiliations

Authors

Contributions

DCG and ABO wrote the manuscript. DCG performed the phytochemical work and data analyses. MFAN performed the in vitro antiplasmodial assays. HVSR performed the multivariate statistical analyses. RAM and LFM performed collection and taxonomic identification of the Palicourea and Psychotria species in the states of Minas Gerais and Pará, respectively. Acquisition of LC–MS was performed by DCG and GCB in the Laboratório de Fitoquímica, Faculdade de Farmácia, UFMG. ABO proposed the research project and supervised its implementation.

Corresponding author

Correspondence to Alaíde Braga de Oliveira.

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The authors declare that they have no known competing financial interests or personal relationships that could have influenced the work reported in this paper.

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Gontijo, D.C., do Nascimento, M.F.A., Rody, H.V.S. et al. In vitro antiplasmodial activity, targeted LC–MS metabolite profiling, and identification of major natural products in the bioactive extracts of Palicourea and Psychotria species from the Amazonia and Atlantic Forest biomes, Brazil. Metabolomics 17, 81 (2021). https://doi.org/10.1007/s11306-021-01833-z

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  • DOI: https://doi.org/10.1007/s11306-021-01833-z

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