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Chemodiversity and Trypanocidal Activity of the Volatile Oils of Tropical Black Sage

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Abstract

Tropical black sage (Varronia curassavica Jacq., Cordiaceae) is a species native to ecosystems subject to strong anthropic action, and thus is at risk of genetic erosion. However, little is known about this important genetic resource, with possible uses in the aromas, fragrances, and pharmaceutical sectors. The objective of this work was to prospect and study native specimens of tropical black sage regarding the content (%, w/w), chemical profile, and trypanocidal activity of the volatile oils. For this purpose, we collected in situ 47 specimens. The volatile oils were obtained by distillation from leaves, quantified, and analyzed by gas chromatography with flame ionization detection and gas chromatography coupled with mass spectrometry. The resulting data were submitted to descriptive statistical and multivariate analyses. The content of volatile oil ranged from 0.3 to 4.2% based on dry leaves. The volatile oils had average contents of 33.4 and 44.9% of oxygenated and non-oxygenated sesquiterpenes, respectively. The proportion of the compound α-humulene varied from 0.3 to 11.1%, with frequency of 100%. Cluster analysis indicated the formation of 10 groups with 50% similarity among the volatile oil samples. The sample with the best trypanocidal activity was ESB45, with IC50 of 74.6 µg/ml and 100% inhibition of the viability of the epimastigote form of Trypanosoma cruzi at the concentration of 300 µg/ml. Tropical black sage is a source of oxygenated sesquiterpenes, an important chemical class for synthesis and development of medicines. For this reason, efforts are necessary to preserve the genetic information about the species.

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Acknowledgements

We gratefully acknowledge support from Professor Rosane Nora Castro (IQ-UFRRJ), the Postgraduate Program in Chemistry (PPFQ-IQ-UFRRJ), Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).

Funding

This study was financed in part by Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ Codes: E-26/211374/2021 and E-26/211.547/2021) and by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES Code 001).

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EADPM, RVN: conceptualization, formal analysis, supervision, writing of the original draft; EBDJ, CSBP, YNM, ASMMV: investigation, formal analysis; DD-R, MEFL, AMS, PCD-Jr, MAAS: supervision; AMS, PCD-Jr, MAAS: funding acquisition, writing, review, and editing; MAAS: conceptualization, project administration, funding acquisition, writing, review, and editing.

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Correspondence to Marco Andre Alves de Souza.

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de Medeiros, E.A.D.P., Nascimento, R.V., Duarte Junior, E.B. et al. Chemodiversity and Trypanocidal Activity of the Volatile Oils of Tropical Black Sage. Rev. Bras. Farmacogn. (2024). https://doi.org/10.1007/s43450-024-00562-3

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