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Ramos AVG, de Sá N, Araújo DLO, Cabral MRP, Costacurta GF, de Freitas BC, Vilegas LV, Scodro RBDL, Siqueira VLD, Cotica ESK, do Carmo MRB, Sarragiotto MH, Baldoqui DC. The chemistry of Vernonanthura nudiflora (Less.) H. Rob. flowers and its antimicrobial activities. Nat Prod Res 2023; 37:502-507. [PMID: 34558351 DOI: 10.1080/14786419.2021.1980790] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Twenty-one known specialised metabolites were isolated from the flowers of Vernonanthura nudiflora (Less.) H. Rob., the structures of the compounds were established based on 1 D and 2 D NMR spectroscopic experiments. Others 28 compounds were putatively identified using the dereplication technique by UHPLC-HRMS/MS. Twenty-three of the compounds are being reported for the first time in this species. The mixture of sesquiterpene lactones piptocarphins A and B (17 + 18), and the flavone velutin (14) were tested against several microorganisms and showed promising activity against Mycobacterium tuberculosis with MIC of 15.6 μg/mL and 31.2 μg/mL, respectively. Furthermore, 17 + 18 showed greater cytotoxicity against VERO cells (IC50 = 7.0 ± 1.73) compared to compound 14 (IC50 85.0 ± 10.6 µg/mL). These findings reveal the feasibility of using the UHPLC-ESI-HRMS/MS-based dereplication strategy in complex fractions to identify specialised metabolites, moreover to V. nudiflora flowers being a source of compounds with antimycobacterial potential.
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Affiliation(s)
| | - Nathália de Sá
- Programa de Pós-graduação em Biociências e Fisiopatologia, Universidade Estadual de Maringá, Maringá, Brazil
| | | | | | | | - Beatriz Cardoso de Freitas
- Programa de Pós-graduação em Biociências e Fisiopatologia, Universidade Estadual de Maringá, Maringá, Brazil
| | - Lenisa Vieira Vilegas
- Programa de Pós-graduação em Biociências e Fisiopatologia, Universidade Estadual de Maringá, Maringá, Brazil
| | - Regiane Bertin de Lima Scodro
- Programa de Pós-graduação em Ciências da Saúde, Universidade Estadual de Maringá, Maringá, Brazil.,Departamento de Análises Clínicas e Biomedicina, Universidade Estadual de Maringá, Maringá, Brazil
| | - Vera Lucia Dias Siqueira
- Programa de Pós-graduação em Biociências e Fisiopatologia, Universidade Estadual de Maringá, Maringá, Brazil.,Departamento de Análises Clínicas e Biomedicina, Universidade Estadual de Maringá, Maringá, Brazil
| | - Erika Seki Kioshima Cotica
- Programa de Pós-graduação em Biociências e Fisiopatologia, Universidade Estadual de Maringá, Maringá, Brazil.,Departamento de Análises Clínicas e Biomedicina, Universidade Estadual de Maringá, Maringá, Brazil
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Bitchagno GTM, Koffi JG, Simo IK, Kagho DUK, Ngouela AS, Lenta BN, Sewald N. LC-ToF-ESI-MS Patterns of Hirsutinolide-like Sesquiterpenoids Present in the Elephantopus mollis Kunth Extract and Chemophenetic Significance of Its Chemical Constituents. Molecules 2021; 26:molecules26164810. [PMID: 34443397 PMCID: PMC8399899 DOI: 10.3390/molecules26164810] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 08/01/2021] [Accepted: 08/04/2021] [Indexed: 11/20/2022] Open
Abstract
A total of nine sesquiterpenoid lactones together with phenolic compounds and other terpenes were identified from the crude methanol extract of Elephantopus mollis Kunth. Compounds were isolated using different chromatographic techniques and their structures were determined by NMR and IR spectroscopy as well as mass spectrometry. The structures of some detected compounds were assigned based on LC-ToF-ESI-MS screening of main fractions/subfractions from flash chromatography and comparison with isolated analogues as standards. The findings revealed not only the in-source loss of water as the base peak in hirsutinolides but also the in-source loss of corresponding alcohol when the oxygen at position 1 is alkylated. The present study also draws up a complement of data with respect to hirsutinolide-like sesquiterpene lactones whose LC-MS characteristics are not available in the literature. The chemophenetic significance is also discussed. Some of the isolated compounds were reported for the first time to be found in the species, the genus as well as the plant family. The medium-polar fractions of the crude extract, also containing the larger amount of sesquiterpenoid lactones, exhibited activity both against a cancer cell line and bacterial strains. Isolated lactones were also active against the cancer cell line, while the chlorogenic derivatives also valuable in Elephantopus genus showed potent radical scavenging activity. This is the first report of cytotoxic and antibacterial activities of our samples against the tested strains and cell line. The present study follows the ongoing research project dealing with the characterization of taxa with antibacterial and antiparasitic activities from Cameroonian pharmacopeia.
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Affiliation(s)
- Gabin Thierry M. Bitchagno
- Department of Chemistry, Faculty of Sciences, University of Dschang, Dschang, Cameroon; (I.K.S.); (A.S.N.)
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, 33501 Bielefeld, Germany;
- Correspondence:
| | - Jean Garba Koffi
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, P.O. Box 47 Yaoundé, Cameroon; (J.G.K.); (B.N.L.)
| | - Ingrid Konga Simo
- Department of Chemistry, Faculty of Sciences, University of Dschang, Dschang, Cameroon; (I.K.S.); (A.S.N.)
| | - Donald Ulrich K. Kagho
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812 Yaoundé, Cameroon;
| | - Augustin Silvere Ngouela
- Department of Chemistry, Faculty of Sciences, University of Dschang, Dschang, Cameroon; (I.K.S.); (A.S.N.)
| | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, P.O. Box 47 Yaoundé, Cameroon; (J.G.K.); (B.N.L.)
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, 33501 Bielefeld, Germany;
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Hristozov D, Da Costa FB, Gasteiger J. Sesquiterpene Lactones-Based Classification of the Family Asteraceae Using Neural Networks and k-Nearest Neighbors. J Chem Inf Model 2006; 47:9-19. [PMID: 17238243 DOI: 10.1021/ci060046x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In a recent publication we described the application of an unsupervised learning method using self-organizing maps to the separation of three tribes and seven subtribes of the plant family Asteraceae based on a set of sesquiterpene lactones (STLs) isolated from individual species. In the present work, two different structure representations--atom counts (2D) and radial distribution function (RDF) (3D)--and two supervised classification methods--counterpropagation neural networks and k-nearest neighbors (k-NN)--were used to predict the tribe in which a given STL occurs. The data set was extended from 144 to 921 STLs, and the Asteraceae tribes were augmented from three to seven. The k-NN classifier with k = 1 showed the best performance, while the RDF code outperformed the atom counts. The quality of the obtained model was assessed with two test sets, which exemplified two possible applications: (1) finding a plant source for a desired compound and (2) based on a plant species chemical profile (STLs): (a) study the relationship between the current taxonomic classification and plant's chemistry and (b) assign a species to a tribe by majority vote. In addition, the problem of defining the applicability domain of the models was assessed by means of two different approaches-principal component analysis combined with Hotelling T2 statistic and an a posteriori probability-based rule.
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Affiliation(s)
- Dimitar Hristozov
- Computer-Chemie-Centrum, Universität Erlangen-Nürnberg, Nägelsbachstrasse 25, D-91052 Erlangen, Germany
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