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Bitombo AN, Zintchem AAA, Atchadé ADT, Mbabi Nyemeck Ii N, Bikobo DSN, Pegnyemb DE, Bochet CG. Antiplasmodial activities of indole alkaloids from Tabernaemontana penduliflora K. Schum (Apocynaceae). Fitoterapia 2021; 153:104941. [PMID: 34029654 DOI: 10.1016/j.fitote.2021.104941] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 05/16/2021] [Accepted: 05/19/2021] [Indexed: 11/26/2022]
Abstract
Five undescribed carboxy-indole alkaloids with corynanthe skeleton, penduflorines A-E (1-3) as well as a voacangine-N-oxide alkaloid, tabernaemontine (4), were isolated along with eight other known compounds (5-12) from the trunk bark of Tabernaemontana penduliflora K. Schum (Apocynaceae). Their structures were determined by means of spectroscopic and spectrometric methods such as UV, IR, NMR and HR-ESI-MS. Antiplasmodial activities of new isolates were evaluated against two strains of Plasmodium falciparum 3D7 and Dd2 by the Sybr green I-based fluorescence assay setup. Those compounds showed good in vitro activities. Among them, penduflorines A and B (1a and 1b) as well as tabernaemontine (4) showed significant inhibitory activities against the two strains with IC50 values ranged between 1.85 and 7.88 μg/mL. This is the first report of quaternary-N-indole alkaloids (1a, 1b, 2, 3a, 3b and 4) occurring in the form of zwitterion from Tabernaemontana genus.
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Affiliation(s)
- André Néhémie Bitombo
- Faculty of science, Department of Organic Chemistry, University of Yaoundé 1, Yaoundé, Cameroon; Department of Chemie, Universität of Fribourg, Fribourg, Switzerland
| | - Auguste Abouem A Zintchem
- Faculty of science, Department of Organic Chemistry, University of Yaoundé 1, Yaoundé, Cameroon; Department of Chemistry, Higher Teacher's Training College, University of Yaoundé 1, Yaoundé, Cameroon
| | | | | | - Dominique Serge Ngono Bikobo
- Faculty of science, Department of Organic Chemistry, University of Yaoundé 1, Yaoundé, Cameroon; Department of Chemie, Universität of Fribourg, Fribourg, Switzerland.
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Tiam ER, Bikobo DSN, Ndassa IM, Nyemeck Ii NM, A Zintchem AA, Ayong L, Diboué PHB, Ndjakou BL, Mbing JN, Pegnyemb DE. Experimental and computational studies of an antiplasmodial derivative of allantoin; antimycobacterial essential oil from Cordia batesii WERNHAM (Boraginaceae). BMC Chem 2021; 15:15. [PMID: 33673871 PMCID: PMC7934435 DOI: 10.1186/s13065-021-00742-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 02/22/2021] [Indexed: 11/13/2022] Open
Abstract
Background Chemical and pharmacological investigations were performed on the stems of Cordia batesii (Boraginaeae); chemical studies included quantum calculations applied on a newly described compound. Results A new derivative of allantoin (1) named batesiin (2) was characterized. Thirteen other known compounds involving allantoin (1) were either isolated or identified. GC–MS enabled the identification of six compounds from a fraction containing essential oil. MeOH extract and some isolated compounds were tested in vitro against Pf7G8 CQS and Pf Dd2 CQR strains of Plasmodium falciparum; extract disclosed a moderate antiplasmodial activity (IC50 = 50 μg mL−1). Meantime, the CH2Cl2 extract and essential oil fraction were tested on a resistant mycobacterial strain of Mycobacterium tuberculosis; a potent antimycobacterial activity with a MIC = 9.52 μg mL−1 was deduced from essential oil. Density functional theory (DFT) calculations were carried on batesiin (2). Calculated chemical shifts at B3LYP/6-31G(d,p) and MPW1PW91/6-31G+(d,p) showed much better correlations with the experimental data. Time dependent DFT at B3LYP/6-31G+(d,p) displayed a major absorption band 3.01 nm higher than the experimental value. Conclusion Cordia batesii can be considered as promising in search of compounds with antimalarial and antitubercular properties. DFT studies are very helpful when trying to learn more about the spectroscopic insights of a derivative of allantoin (1).
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Affiliation(s)
- Eric Robert Tiam
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O Box 812, Yaounde, Cameroon
| | | | - Ibrahim Mbouombouo Ndassa
- Department of Inorganic Chemistry, Faculty of Science, University of Yaoundé I, P.O Box 812, Yaounde, Cameroon.,Department of Chemistry, Higher Training College, University of Yaoundé I, P.O Box 47, Yaounde, Cameroon
| | - Norbert Mbabi Nyemeck Ii
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O Box 812, Yaounde, Cameroon
| | - Auguste Abouem A Zintchem
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O Box 812, Yaounde, Cameroon. .,Department of Chemistry, Higher Training College, University of Yaoundé I, P.O Box 47, Yaounde, Cameroon.
| | | | - Patrick Hervé Betote Diboué
- Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies, Yaounde, Cameroon
| | - Bruno Lenta Ndjakou
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O Box 812, Yaounde, Cameroon.,Department of Chemistry, Higher Training College, University of Yaoundé I, P.O Box 47, Yaounde, Cameroon
| | - Joséphine Ngo Mbing
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O Box 812, Yaounde, Cameroon
| | - Dieudonné Emmanuel Pegnyemb
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O Box 812, Yaounde, Cameroon
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