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Kakabi MHD, Simo Mpetga JD, Tamokou JDD, Matsuete GT, Nago RDT, Bitchagno GTM, Lenta BN, Sewald N, Tene M, Ngouela AS. Two new flavone glycosides from the leaves of Ochna afzelii Oliv. (Ochnaceae). Nat Prod Res 2024; 38:447-457. [PMID: 36148610 DOI: 10.1080/14786419.2022.2126840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 07/15/2022] [Accepted: 09/11/2022] [Indexed: 10/14/2022]
Abstract
Two new glycosylflavones, 6''-O-acetyl-8-C-β-D-galactopyranosylchrysoeriol (1) and 8-C-β-D-galactopyranosylchrysoeriol (2) were isolated from the methanol extract of the leaves of Ochna afzelii Oliv., along with four known compounds namely 8-C-β-D-galactopyranosylapigenin (3), ochnaflavone (4), sitosterol-3-O-β-D-glucopyranoside (5) and D-mannitol (6). Isolation was performed chromatographically and the structures of the purified compounds were elucidated by analyzing their spectroscopic and mass spectrometric data. The antibacterial activity of extract, fractions, and compounds 1 - 4 was evaluated using broth microdilution method against Gram-positive and Gram-negative bacteria while the antioxidant capacity was performed using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and the ferric reducing antioxidant power (FRAP) methods. The new flavones (1 and 2) displayed moderate antibacterial activities (MIC = 32 - 64 µg/mL) and weak antioxidant properties.
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Affiliation(s)
- Morel Hervé D Kakabi
- Natural Products Chemistry Research Unit, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - James D Simo Mpetga
- Natural Products Chemistry Research Unit, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Jean-De-Dieu Tamokou
- Research Unit of Microbiology and Antimicrobial Substances, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Germaine Takongmo Matsuete
- Research Unit of Microbiology and Antimicrobial Substances, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Romeo Désiré T Nago
- Natural Products Chemistry Research Unit, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Gabin Thierry M Bitchagno
- Natural Products Chemistry Research Unit, Faculty of Science, University of Dschang, Dschang, Cameroon
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Bruno N Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, Yaounde, Cameroon
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Mathieu Tene
- Natural Products Chemistry Research Unit, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Augustin Silvère Ngouela
- Natural Products Chemistry Research Unit, Faculty of Science, University of Dschang, Dschang, Cameroon
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Nago RDT, Simo Mpetga JD, Tamokou JDD, Tanemossu Fobofou SA, Mbahbou Bitchagno GT, Wessjohann LA, Tene M, Silvere Ngouela A. A New Ceramide from Cissus Aralioides Baker (Vitaceae) and its Antimicrobial Activity. Chem Biodivers 2023; 20:e202200678. [PMID: 36480444 DOI: 10.1002/cbdv.202200678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 07/20/2022] [Revised: 12/02/2022] [Accepted: 12/05/2022] [Indexed: 12/13/2022]
Abstract
Purification through repeated column chromatography over silica gel and Sephadex LH-20 of the ethanol extract of the stems of Cissus aralioides (Baker) Planch. resulted in the isolation of a new ceramide, aralioidamide A (1), along with five known compounds (2-6). Their structures were determined by the extensive analyses of their spectroscopic (1D and 2D NMR) and spectrometric data, and comparison with those reported in the literature. Aralioidamide A (1) displayed weak antibacterial activity (MIC=256 μg/mL) against Bacillus subtilis, Staphylococcus aureus and Shigella flexneri and was inactive (MIC>256 μg/mL) against the tested fungi.
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Affiliation(s)
- Romeo Desire T Nago
- Natural Products Chemistry Research Unit, Chemistry Department, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - James D Simo Mpetga
- Natural Products Chemistry Research Unit, Chemistry Department, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Jean-De-Dieu Tamokou
- Research Unit of Microbiology and Antimicrobial Substances, Biochemistry Department, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Serge A Tanemossu Fobofou
- Department of Bioorganic Chemistry, Leibniz Institute for Plant Biochemistry, D-06120, Halle (Saale), Germany.,Institute of Pharmaceutical Biology, Technische Universität Braunschweig, D-38106, Braunschweig, Germany
| | - Gabin T Mbahbou Bitchagno
- Natural Products Chemistry Research Unit, Chemistry Department, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Ludger A Wessjohann
- Department of Bioorganic Chemistry, Leibniz Institute for Plant Biochemistry, D-06120, Halle (Saale), Germany
| | - Mathieu Tene
- Natural Products Chemistry Research Unit, Chemistry Department, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Augustin Silvere Ngouela
- Natural Products Chemistry Research Unit, Chemistry Department, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
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Tedonkeu AT, Tamokou JDD, Mpetga JDS, Nzogong RT, Kengne IC, Hao XJ, Tene M. A new antimicrobial nor-friedelane-type triterpenoid and other constituents from Plectranthus glandulosus Hook. f. (Lamiaceae). Nat Prod Res 2021; 36:4587-4596. [PMID: 34727811 DOI: 10.1080/14786419.2021.1999946] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Chemical investigation of the ethanol extract from the whole plant of Plectranthus glandulosus led to the isolation of a new nor-triterpenoid (1) along with seventeen known compounds (2-18) including seven triterpenoids, nine flavonoids and one steroid. Their structures were established on the basis of 1D- and 2D-NMR, IR, and MS experiments, and by comparison of their spectroscopic data with those of similar compounds reported in the literature. The EtOH extract and some isolated triterpenoids (1-4 and 13) were subjected to in vitro antimicrobial assays against a panel of pathogenic microorganisms, including Gram-positive and Gram-negative bacteria, and fungi using broth microdilution method. The EtOH extract displayed moderate activity (MIC = 512 µg/mL) against Staphylococcus aureus MSSA1, Shigella flexneri SDINT and Cryptococcus neoformans H99. Compounds 1, 4 and 13 showed the most potent antimicrobial effect with MICs of 32-256 µg/mL.
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Affiliation(s)
- Alex Tchinda Tedonkeu
- Natural Products Chemistry Research Unit, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Jean-De-Dieu Tamokou
- Research Unit of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - James D Simo Mpetga
- Natural Products Chemistry Research Unit, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Raissa Tioyem Nzogong
- Natural Products Chemistry Research Unit, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Irene Chinda Kengne
- Research Unit of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Xiao-Jiang Hao
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, People's Republic of China
| | - Mathieu Tene
- Natural Products Chemistry Research Unit, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
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Nago RDT, Nayim P, Mbaveng AT, Mpetga JDS, Bitchagno GTM, Garandi B, Tane P, Lenta BN, Sewald N, Tene M, Kuete V, Ngouela AS. Prenylated Flavonoids and C-15 Isoprenoid Analogues with Antibacterial Properties from the Whole Plant of Imperata cylindrica (L.) Raeusch (Gramineae). Molecules 2021; 26:molecules26164717. [PMID: 34443305 PMCID: PMC8401516 DOI: 10.3390/molecules26164717] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/20/2021] [Accepted: 07/22/2021] [Indexed: 11/16/2022] Open
Abstract
The local botanical Imperata cylindrica in Cameroon was investigated for its antibacterial potency. The methanol extract afforded a total of seven compounds, including five hitherto unreported compounds comprising three flavonoids (1–3) and two C-15 isoprenoid analogues (4 and 5) together with known derivatives (6 and 7). The novelty of the flavonoids was related to the presence of both methyl and prenyl groups. The potential origin of the methyl in the flavonoids is discussed, as well as the chemophenetic significance of our findings. Isolation was performed over repeated silica gel and Sephadex LH-20 column chromatography and the structures were elucidated by (NMR and MS). The crude methanol extract and isolated compounds showed considerable antibacterial potency against a panel of multi-drug resistant (MDR) bacterial strains. The best MIC values were obtained with compound (2) against S. aureus ATCC 25923 (32 µg/mL) and MRSA1 (16 µg/mL).
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Affiliation(s)
- Romeo D. Tadjouate Nago
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang, Cameroon; (R.D.T.N.); (M.T.); (A.S.N.)
| | - Paul Nayim
- Department of Biochemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang, Cameroon; (P.N.); (A.T.M.); (B.G.); (V.K.)
| | - Armelle T. Mbaveng
- Department of Biochemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang, Cameroon; (P.N.); (A.T.M.); (B.G.); (V.K.)
| | - James D. Simo Mpetga
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang, Cameroon; (R.D.T.N.); (M.T.); (A.S.N.)
- Correspondence: (J.D.S.M.); (G.T.M.B.)
| | - Gabin T. Mbahbou Bitchagno
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang, Cameroon; (R.D.T.N.); (M.T.); (A.S.N.)
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany;
- Correspondence: (J.D.S.M.); (G.T.M.B.)
| | - Badawe Garandi
- Department of Biochemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang, Cameroon; (P.N.); (A.T.M.); (B.G.); (V.K.)
| | - Pierre Tane
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang, Cameroon; (R.D.T.N.); (M.T.); (A.S.N.)
| | - Bruno N. Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, P.O. Box 47 Yaounde, Cameroon;
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany;
| | - Mathieu Tene
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang, Cameroon; (R.D.T.N.); (M.T.); (A.S.N.)
| | - Victor Kuete
- Department of Biochemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang, Cameroon; (P.N.); (A.T.M.); (B.G.); (V.K.)
| | - Augustin Silvere Ngouela
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang, Cameroon; (R.D.T.N.); (M.T.); (A.S.N.)
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Damen F, Simo Mpetga JD, Demgne OMF, Çelik İ, Wamba BE, Tapondjou LA, Beng VP, Levent S, Kuete V, Tene M. Roeperone A, a new tetraoxygenated xanthone and other compounds from the leaves of Hypericum roeperianum Schimp. (Hypericaceae). Nat Prod Res 2020; 36:2071-2077. [DOI: 10.1080/14786419.2020.1845674] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- François Damen
- Department of Chemistry, University of Dschang, Dschang, Cameroon
| | | | - Olive Monique F. Demgne
- Department of Biochemistry, University of Dschang, Dschang, Cameroon
- Department of Biochemistry, University of Yaoundé, Yaoundé I, Cameroon
| | - İlhami Çelik
- Department of Chemistry, Faculty of Science, Eskisehir Technical University, Eskisehir, Turkey
| | - Brice E.N Wamba
- Department of Biochemistry, University of Dschang, Dschang, Cameroon
| | | | - Veronique P. Beng
- Department of Biochemistry, University of Yaoundé, Yaoundé I, Cameroon
| | - Serkan Levent
- Doping and Narcotic Compounds Analysis Laboratory, Faculty of Pharmacy, Anadolu University, Eskisehir, Turkey
| | - Victor Kuete
- Department of Biochemistry, University of Dschang, Dschang, Cameroon
| | - Mathieu Tene
- Department of Chemistry, University of Dschang, Dschang, Cameroon
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Atontsa BCK, Bitchagno GTM, Mpetga JDS, Wamba BEN, Nayim P, Tchuenguem RT, Ndontsa BL, Koagne RR, Opatz T, Kuete V, Tane P. Caffeate and piperidine-3-ol derivatives from the stem bark of Cassia sieberiana. Nat Prod Res 2019; 35:2507-2514. [PMID: 31674835 DOI: 10.1080/14786419.2019.1684278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A new caffeate derivative from the ethanol extract of the stem bark of Cassia sieberiana DC. is described herein along with the known secondary metabolites spectaline (2), iso-6-cassine (3), 3-O-methyl-chiro-inositol (4), monobehenin (5), octyl nonadecyloate (6), β-sitosterol (7), stigmasterol (8) and sitosterol 3-O-β-D-glucopyranoside (9). The chemical structures were elucidated by means of various spectroscopic and spectrometric techniques. Extract and isolated compounds were devoid of inhibitory action against the herein selected bacterial strains (MICs > 256 μg/mL) but showed capacities to reduce 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical (EC50 < 3 μg/mL) considerably better than the "gold standard" trolox (EC50 6.47 ± 0.48 μg/mL).
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Affiliation(s)
| | - Gabin Thierry M Bitchagno
- Department of Chemistry, University of Dschang, Dschang, Cameroon.,Institute of Organic Chemistry, University of Mainz, Mainz, Germany
| | | | | | - Paul Nayim
- Department of Biochemistry, University of Dschang, Dschang, Cameroon
| | | | | | - Romeol R Koagne
- Department of Chemistry, University of Dschang, Dschang, Cameroon
| | - Till Opatz
- Institute of Organic Chemistry, University of Mainz, Mainz, Germany
| | - Victor Kuete
- Department of Biochemistry, University of Dschang, Dschang, Cameroon
| | - Pierre Tane
- Department of Chemistry, University of Dschang, Dschang, Cameroon
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Damen F, Demgne OMF, Bitchagno GTM, Celik I, Mpetga JDS, Tankeo SB, Opatz T, Kuete V, Tane P. A new polyketide from the bark of Hypericum roeperianum Schimp. (Hypericaceae). Nat Prod Res 2019; 35:2381-2387. [PMID: 31612738 DOI: 10.1080/14786419.2019.1677655] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The isolation and spectroscopic data of a hitherto undescribed polyketide (1) from Hypericum roeperianum Schimp. (Hypericaceae) together with six known compounds (2-7) is herein reported. The structure elucidation is based on extensive 1D- and 2D-NMR, infrared, UV and MS experiments. The structures of the known compounds were confirmed by comparison of their spectroscopic data with those of similar reported compounds in the literature. Some of the isolated compounds had a significant activity against a panel of multidrug-resistant bacterial strains.Supplemental data for this article can be accessed at https://doi.org/10.1080/14786419.2019.1677655.
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Affiliation(s)
- François Damen
- Department of Chemistry, University of Dschang , Dschang , Cameroon
| | | | - Gabin Thierry M Bitchagno
- Department of Chemistry, University of Dschang , Dschang , Cameroon.,Institute of Organic Chemistry, Johannes Gutenberg-University of Mainz , Mainz , Germany
| | - Ilhami Celik
- Department of Chemistry, Faculty of Science, Eskishir Technical University , Eskishir , Turkey
| | | | | | - Till Opatz
- Institute of Organic Chemistry, Johannes Gutenberg-University of Mainz , Mainz , Germany
| | - Victor Kuete
- Department of Biochemistry, University of Dschang , Dschang , Cameroon
| | - Pierre Tane
- Department of Chemistry, University of Dschang , Dschang , Cameroon
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Bitchagno GTM, Tankeo SB, Tsopmo A, Simo Mpetga JD, Tchinda AT, Fobofou SAT, Nkuete AHL, Wessjohann LA, Kuete V, Tane P. Ericoside, a new antibacterial biflavonoid from Erica mannii (Ericaceae). Fitoterapia 2016; 109:206-11. [DOI: 10.1016/j.fitote.2015.12.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2015] [Revised: 12/13/2015] [Accepted: 12/15/2015] [Indexed: 10/22/2022]
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Mpetga JDS, Shen Y, Tane P, Li SF, He HP, Wabo HK, Tene M, Leng Y, Hao XJ. Cycloartane and friedelane triterpenoids from the leaves of Caloncoba glauca and their evaluation for inhibition of 11β-hydroxysteroid dehydrogenases. J Nat Prod 2012; 75:599-604. [PMID: 22360639 DOI: 10.1021/np200831c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Five new triterpenoids, caloncobic acids A and B (1 and 2), caloncobalactones A and B (3 and 4), and glaucalactone (5), along with the known compounds 3β,21β-dihydroxy-30-nor-(D:A)-friedo-olean-20(29)-en-27-oic acid (6) and acetyltrichadenic acid B (7), were isolated from the leaves of Caloncoba glauca. The structures of 1-5 were elucidated using spectroscopic methods. Compounds 1-7 were evaluated for their inhibitory activities against two isozymes of 11β-hydroxysteroid dehydrogenase (11β-HSD1 and 11β-HSD2). Compounds 1 and 2 exhibited strong inhibitory activities against mouse (EC(50) 132 and 13 nM) and human (EC(50) 105 and 72 nM) 11β-HSD1.
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Affiliation(s)
- James D Simo Mpetga
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
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