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Ngangoue MO, Ndifor AR, Ambassa P, Guefack MGF, Kuete JRN, Chi GF, Ngameni B, Kuete V, Ngadjui BT. Isolation and antibacterial activity of anomanol B and other secondary metabolites from the stem bark of Anonidium mannii (Annonaceae). Nat Prod Res 2024; 38:1813-1822. [PMID: 37345499 DOI: 10.1080/14786419.2023.2223728] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 06/05/2023] [Indexed: 06/23/2023]
Abstract
A new Lanosta-7,9(11),22-trien-3,15,20-triol named Anomanol B 1, together with five known compounds: manniindole 2, arborinine 3, polycarpol 4, 8,9-dimethoxyphenanthridin-6(5H)-one 5 and 3-O-β-D-glucopyranosyl-β-sitosterol 6 were isolated from the stem bark extract of Anonidium mannii by routine chromatography techniques. 8,9-dimethoxyphenanthridin-6(5H)-one 5, was reported from natural origin for the first time. The structures of the compounds were established by comprehensive elucidation of spectroscopic data and by comparison with literature data. Evaluation of the isolates on Gram-negative bacteria such as Escherichia coli, Enterobacter aerogenes, Klebsiella pneumoniae, Providencia stuartii, and Pseudomonas aeruginosa showed that, compound 1 had weak antibacterial activity with minimal inhibitory concentrations (MIC) varying from 128 to 256 µg/mL. Compounds 3, 5, and 6 exhibited moderate to weak activity with MIC of 32 to 128 µg/mL and 64 to 256 µg/mL compared to the reference drug chloramphenicol which inhibited the growth of all studied bacteria with MIC values of 16 to 64 µg/mL.
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Affiliation(s)
| | - Ache Roland Ndifor
- Higher Technical Teachers Training College, University of Bamenda, Bambili, Cameroon
| | - Pantaleon Ambassa
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
| | - Michel-Gael F Guefack
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Jenifer R N Kuete
- Department of Chemsitry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Godloves Fru Chi
- Department of Chemistry, Faculty of Science, University of Buea, Buea, Cameroon
| | - Bathelemy Ngameni
- Department of Pharmacognosy and Pharmaceutical Chemistry, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, Yaoundé, Cameroon
| | - Victor Kuete
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Bonaventure Tchaleu Ngadjui
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
- University Institute of Science, Technologies and Ethic, Yaoundé, Cameroun
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2
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Kamlo Kamso VF, Dongmo Melogmo YK, Tchegnitegni BT, Tchatat Tali MB, Dize D, Ngansop CN, Ambassa P, Ouete Nantchouang JL, Konga IS, Boyom FF, Ngadjui BT, Fotso GW. New lignan glycosides from Justicia secunda Vahl (Acanthaceae) with antimicrobial and antiparasitic properties. Heliyon 2023; 9:e22897. [PMID: 38125494 PMCID: PMC10730754 DOI: 10.1016/j.heliyon.2023.e22897] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 11/21/2023] [Accepted: 11/22/2023] [Indexed: 12/23/2023] Open
Abstract
Three new lignan glucosides, namely, justisecundosides A (1), B (2a), and C (2b), were isolated from the whole plant of Justicia secunda together with seven known compounds (3-9). Their structures were established based on a comprehensive analysis of HR-ESI-MS, IR, UV, and CD, in conjunction with their 1D and 2D-NMR data. A putative biogenetic pathway of compounds 1-2a,b from coniferyl alcohol was proposed. In addition, the antimicrobialactivities of the extract, fractions, and some isolated compounds were assessed against multiresistant bacterial and fungal strains. Furthermore, the antiplasmodial, antileishmanial, and antitrypanosomal activities were assessed against the sensitive (3D7) and multidrug-resistant (Dd2) strains of P. falciparum, promastigote and bloodstream forms of L. donovani, and Trypanosoma brucei, respectively. Compound 4 exhibited moderate antibacterial activity against Staphylococcus aureus SA RN 46003 with a MIC value of 62.5 μg/mL. Besides, compound 6 demonstrated a very good activity against sensitive (IC50Pf3D7: 0.81 μg/mL) and multidrug-resistant (IC50PfDd2: 14.61 μg/mL) strains of P. falciparum while compound 4 displayed good antitrypanosomal activity (IC50: 1.19 μg/mL). Also, compound 1 was the most active on the promastigote form of L. donovani with an IC50 of 13.02 μg/mL.
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Affiliation(s)
- Viviane Flore Kamlo Kamso
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | | | | | | | - Darline Dize
- Department of Biochemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Cyrille Njampa Ngansop
- Department of Biochemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Pantaléon Ambassa
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | | | - Ingrid Simo Konga
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Fabrice Fekam Boyom
- Department of Biochemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Bonaventure Tchaleu Ngadjui
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
- University Institute of Sciences, Technologies and Ethics, P.O. Box 30201, Yaoundé, Cameroon
| | - Ghislain Wabo Fotso
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
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Nganteng DND, Melong R, Maffo T, Tchuenguem RT, Crochet A, Dzoyem JP, Wafo P, Bochet CG, Ngadjui BT. New antimicrobial cyclolignan and others constituents from the leaves of Scyphocephalium mannii (Benth. & Hook.f.) Warb. Nat Prod Res 2022; 36:5991-5998. [DOI: 10.1080/14786419.2022.2056891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Dieu Ne Dort Nganteng
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | - Raduis Melong
- Department of Fundamental Science, Higher Technical Teachers’ Training College, University of Bamenda, Bamenda, Cameroon
- Department of Chemistry, Faculty of science and Medicine, University of Fribourg, Fribourg, Switzerland
| | - Timoleon Maffo
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | - Roland T. Tchuenguem
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Aurelien Crochet
- Department of Chemistry, Faculty of science and Medicine, University of Fribourg, Fribourg, Switzerland
| | - Jean Paul Dzoyem
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Pascal Wafo
- Department of Chemistry, Higher Teachers’ Training College, University of Yaounde I, Yaounde, Cameroon
| | - Christian G. Bochet
- Department of Chemistry, Faculty of science and Medicine, University of Fribourg, Fribourg, Switzerland
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Mouafon IL, Mountessou BYG, Lateef M, Tchamgoue J, Shaiq Ali M, Tchouankeu JC, Green IR, Ngadjui BT, Kouam SF. Atricephenols A and B, two phenolic compounds from Indigofera atriceps Hook.f. (Fabaceae). Nat Prod Res 2022:1-8. [PMID: 35175885 DOI: 10.1080/14786419.2022.2041007] [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] [Indexed: 10/19/2022]
Abstract
The phytochemical investigation of a previously unstudied species of the genus Indigofera, I. atriceps Hook.f. was undertaken and two new phenolic compounds, atricephenols A (1) and B (2) were isolated, along with nine known secondary metabolites viz., (-)-melilotocarpan D (3), genistein (4), melilotocarpan A (5), maackiain (6), p-hydroxybenzaldehyde (7), bornesitol (8), β-sitosterol (9), sitosterol-3-O-β-D-glucopyranoside (10) and stigmasterol-3-O-β-D-glucopyranoside (11). Their structures were elucidated by extensive NMR spectroscopic analyses and HRESIMS, and by comparing their data with those reported in the literature. Compounds 1, 4, 7-11 were tested for their antibacterial efficacies and for their potential to inhibit the enzyme urease. Compounds 7 and 9 showed significant antibacterial activity against Salmonella typhi (ZOIs of 13 and 15 mm, respectively), while the best urease inhibition was measured for compound 9 with an IC50 value of 18.6 µM, which is higher than that of the potent inhibitor, thiourea (IC50 = 21.5 µM).
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Affiliation(s)
- Iliassou Lah Mouafon
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon.,Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon.,H.E.J. Research Institute of Chemistry, International Centre for Chemical and Biological Sciences (ICCBS), University of Karachi, Karachi, Pakistan
| | | | - Mehreen Lateef
- Multidisciplinary Research Lab (MDRL), Bahria University Medical and Dental College, Karachi, Pakistan
| | - Joseph Tchamgoue
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
| | - Muhammad Shaiq Ali
- H.E.J. Research Institute of Chemistry, International Centre for Chemical and Biological Sciences (ICCBS), University of Karachi, Karachi, Pakistan
| | - Jean Claude Tchouankeu
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
| | - Ivan Robert Green
- Department of Chemistry and Polymer Science, University of Stellenbosch, Matieland, Stellenbosch, South Africa
| | | | - Simeon Fogue Kouam
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
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Membe Femoe U, Kadji Fassi JB, Boukeng Jatsa H, Tchoffo YL, Amvame Nna DC, Kamdoum BC, Njonte Wouamba SC, Toussie Tchegnitegni B, Tchaleu Ngadjui B, Sewald N, Ndjakou Lenta B, Tchuem Tchuente LA, Dimo T. In Vitro Assessment of the Cercaricidal Activity of Sida acuta Burm. F. and Sida rhombifolia Linn. (Malvaceae) Hydroethanolic Extracts, Cytotoxicity, and Phytochemical Studies. Evid Based Complement Alternat Med 2022; 2022:7281144. [PMID: 35047048 PMCID: PMC8763507 DOI: 10.1155/2022/7281144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 12/17/2021] [Indexed: 11/17/2022]
Abstract
Despite the global efforts, schistosomiasis remains a public health problem in several tropical and subtropical countries. One of the major challenges in the fight against schistosomiasis is the interruption of the parasite life cycle. Here, we evaluated the anticercarial, cytotoxicity, and phytochemical profiles of Sida acuta (HESa) and Sida rhombifolia (HESr) hydroethanolic extracts (Malvaceae). Schistosoma mansoni cercaria was collected from fifteen Biomphalaria pfeifferi-infected snails. Twenty-five cercariae were incubated in duplicate with different concentrations (31.25-1,000 μg/mL) of HESa or HESr. The cercaria viability was monitored at 30 min time intervals for 150 min, and the concentration-response curve of each plant extract was used to determine their respective lethal concentration 50 (LC50). Additionally, the cytotoxicity profile of each plant extract was evaluated on the Hepa 1-6 cell line at a concentration range of 15.625-1,000 µg/mL using the WST-8 assay method and its inhibitory concentration 50 (IC50) was calculated. Moreover, phytochemical characterization of each plant extract was carried out by HPLC-MS. Both extracts exhibited cercaricidal activity in a time- and concentration-dependent manner. At 30 min time point, HESa (LC50 = 28.41 ± 3.5 µg/mL) was more effective than HESr (LC50 = 172.42 ± 26.16 µg/mL) in killing S. mansoni cercariae. Regarding the cytotoxicity effect of both extracts, the IC50 of HESa (IC50 = 109.67 µg/mL) was lower than that of HESr (IC50 = 888.79 µg/mL). The selectivity index was 3.86 and 5.15 for HESa and HESr, respectively. Fifteen compounds were identified from HESa and HESr after HPLC-MS analysis. N-Feruloyltyramine, a polyphenol, and thamnosmonin, a coumarin, were identified in both extracts. HESa and HESr displayed cercaricidal activity and were not toxic on Hepa 1-6 cell line. Based on the selectivity index of these extracts, S. rhombifolia extract could be more effective on S. mansoni cercariae than S. acuta extract. This study could provide baseline information for further investigations aiming to develop plant-based alternative drugs against S. mansoni.
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Affiliation(s)
- Ulrich Membe Femoe
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
- Centre for Schistosomiasis and Parasitology, P.O. Box 7244, Yaounde, Cameroon
| | - Joseph Bertin Kadji Fassi
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
- Centre for Schistosomiasis and Parasitology, P.O. Box 7244, Yaounde, Cameroon
| | - Hermine Boukeng Jatsa
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
- Centre for Schistosomiasis and Parasitology, P.O. Box 7244, Yaounde, Cameroon
| | - Yannick Leonel Tchoffo
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
- Centre for Schistosomiasis and Parasitology, P.O. Box 7244, Yaounde, Cameroon
| | - David Carel Amvame Nna
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
- Centre for Schistosomiasis and Parasitology, P.O. Box 7244, Yaounde, Cameroon
| | - Blaise Cédric Kamdoum
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
| | | | - Billy Toussie Tchegnitegni
- Department of Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, P.O. BOX 100131, D-33501, Bielefeld, Germany
| | - Bonaventure Tchaleu Ngadjui
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
| | - Norbert Sewald
- Department of Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, P.O. BOX 100131, D-33501, Bielefeld, Germany
| | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, P.O. Box 47, Yaounde, Cameroon
| | - Louis-Albert Tchuem Tchuente
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
- Centre for Schistosomiasis and Parasitology, P.O. Box 7244, Yaounde, Cameroon
| | - Theophile Dimo
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
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Kamdoum BC, Simo I, Wouamba SCN, Tchatat Tali BM, Ngameni B, Fotso GW, Ambassa P, Fabrice FB, Lenta BN, Sewald N, Ngadjui BT. Chemical constituents of two Cameroonian medicinal plants: Sida rhombifolia L. and Sida acuta Burm. f. (Malvaceae) and their antiplasmodial activity. Nat Prod Res 2021; 36:5311-5318. [PMID: 34121522 DOI: 10.1080/14786419.2021.1937156] [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] [Indexed: 10/21/2022]
Abstract
An extensive phytochemical investigation of the EtOH/H2O (7:3) extracts of Sida rhombifolia L. and Sida acuta Burm. f., yielded a previously undescribed ceramide named rhombifoliamide (1) and a xylitol dimer (2), naturally isolated here for the first time, as well as the thirteen known compounds viz, oleanolic acid (3), β-amyrin glucoside (4), ursolic acid (5), β-sitosterol glucoside (6), tiliroside (7), 1,6-dihydroxyxanthone (8), a mixture of stigmasterol (9) and β-sitosterol (10), cryptolepine (11), 20-Hydroxyecdysone (12), (E)-suberenol (13), thamnosmonin (14) and xanthyletin (15). Their structures were elucidated by the analyses of their spectroscopic and spectrometric data (1 D and 2 D NMR, and HRESI-MS) and by comparison with the previously reported data. The crude extracts, fractions, and some isolated compounds were tested against chloroquine-sensitive (3D7) and chloroquine-resistant (Dd2) Plasmodium falciparum strains. All the tested samples demonstrated moderate and/or significant activities against 3D7 (IC50 values: 0.18-20.11 µg/mL) and Dd2 (IC50 values: 0.74-63.09 µg/mL).
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Affiliation(s)
- Blaise Cedric Kamdoum
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | - Ingrid Simo
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Steven Collins Njonte Wouamba
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon.,Department of Chemistry, Higher Teacher Training College, University of Yaounde I, Yaounde, Cameroon
| | | | - Bathelemy Ngameni
- Department of pharmacy, Faculty of Medicine and Biomedical Sciences, University of Yaounde I, Yaounde, Cameroon
| | - Ghislain Wabo Fotso
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | - Pantaléon Ambassa
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | - Fekam Boyom Fabrice
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, Yaounde, Cameroon
| | - Bruno Ndjakou Lenta
- Department of Biochemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, Bielefeld, Germany
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Tchoukoua A, Douanla MH, Ariefta NR, Yoshida J, Ito Y, Ngadjui BT, Shiono Y. Triterpene saponins from the roots of Acacia senegal (L.) Willd. Fitoterapia 2021; 151:104859. [PMID: 33610746 DOI: 10.1016/j.fitote.2021.104859] [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] [Received: 12/15/2020] [Revised: 02/03/2021] [Accepted: 02/04/2021] [Indexed: 10/22/2022]
Abstract
Six new triterpenoid saponins, named senegalosides A-F (1-6) were isolated from the seedpods and roots of Acacia senegal (Mimosaceae). Their structures were elucidated using 1D and 2D-NMR spectroscopic analysis and mass spectrometry. Compound 1 possesses an unusual sapogenin, 3β-hydroxy-21-oxo-olean-12-en-28-oic acid (machaeric acid), and was reported here in its natural form for the first time within the genus Acacia. Senegaloside A is the first example of a machaeric-type triterpenoid glycoside in the plant kingdom. The cytotoxic effect of isolated saponins was evaluated on the H4IIE rat hepatoma cell line. As a result, compounds 1, 3-6 were not significantly cytotoxic to H4IIE cells even at 200 μM. Compound 2 was suppressed cell viability at 50-200 μM.
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Affiliation(s)
- Abdou Tchoukoua
- Department of Chemistry, Faculty of Science, University of Maroua, P.O. Box 814, Maroua, Cameroon.
| | - Mireille Heti Douanla
- Department of Organic Chemistry, University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon
| | - Nanang Rudianto Ariefta
- Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata 997-8555, Japan
| | - Jun Yoshida
- Center for Liberal Arts and Sciences, Iwate Medical University, Yahaba, Iwate 028-3694, Japan
| | - Yoshiaki Ito
- Department of Biological Chemistry and Food Science, Faculty of Agriculture, Iwate University, Morioka, Iwate 020-8550, Japan
| | | | - Yoshihito Shiono
- Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata 997-8555, Japan.
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Fotso GW, Ngameni B, Storr TE, Ngadjui BT, Mafu S, Stephenson GR. Synthesis of Novel Stilbene-Coumarin Derivatives and Antifungal Screening of Monotes kerstingii-Specialized Metabolites Against Fusarium oxysporum. Antibiotics (Basel) 2020; 9:antibiotics9090537. [PMID: 32854223 PMCID: PMC7558447 DOI: 10.3390/antibiotics9090537] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 08/03/2020] [Revised: 08/22/2020] [Accepted: 08/23/2020] [Indexed: 12/19/2022] Open
Abstract
Fusarium is one of the most toxigenic phytopathogens causing diseases and reduced agricultural productivity worldwide. Current chemical fungicides exhibit toxicity against non-target organisms, triggering negative environmental impact, and are a danger to consumers. In order to explore the chemical diversity of plants for potential antifungal applications, crude extract and fractions from Monotes kerstingii were screened for their activity against two multi-resistant Fusarium oxysporum strains: Fo32931 and Fo4287. Antifungal activity was evaluated by the determination of minimum inhibitory concentration (MIC) by broth dilution of fermentative yeasts using kinetic OD600 nm reading by a spectrophotometer. The n-butanol fraction showed the best activity against Fo4287. We screened eleven previously reported natural compounds isolated from different fractions, and a stilbene-coumarin 5-[(1E)-2-(4-hydroxyphenyl)ethenyl]-4,7-dimethoxy-3-methyl-2H-1-benzopyran-2-one (1) was the most active compound against both strains. Compound 1 was employed as a nucleophile with a selection of electrophilic derivatizing agents to synthesize five novel stilbene-coumarin analogues. These semisynthetic derivatives showed moderate activity against Fo32931 with only prenylated derivative exhibiting activity comparable to the natural stilbene-coumarin (1), demonstrating the key role of the phenolic group.
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Affiliation(s)
- Ghislain Wabo Fotso
- Department of Organic Chemistry, Faculty of Science University of Yaoundé I, P.O. Box 812 Yaoundé, Cameroon; (G.W.F.); (B.T.N.)
- Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, MA 01003, USA
| | - Bathelemy Ngameni
- Department of Pharmacognosy and Pharmaceutical Chemistry, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, P.O. Box 1364 Yaoundé, Cameroon
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK; (T.E.S.); (G.R.S.)
- Correspondence: (B.N.); (S.M.); Tel.: +237-690-230-281 (B.N.); +1-413-545-4083 (S.M.)
| | - Thomas E. Storr
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK; (T.E.S.); (G.R.S.)
| | - Bonaventure Tchaleu Ngadjui
- Department of Organic Chemistry, Faculty of Science University of Yaoundé I, P.O. Box 812 Yaoundé, Cameroon; (G.W.F.); (B.T.N.)
| | - Sibongile Mafu
- Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, MA 01003, USA
- Correspondence: (B.N.); (S.M.); Tel.: +237-690-230-281 (B.N.); +1-413-545-4083 (S.M.)
| | - G. Richard Stephenson
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK; (T.E.S.); (G.R.S.)
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Tchatchouang Noulala CG, Fotso GW, Rennert R, Lenta BN, Sewald N, Arnold N, Happi EN, Ngadjui BT. Mesomeric form of quaternary indoloquinazoline alkaloid and other constituents from the Cameroonian Rutaceae Araliopsis soyauxii Engl. BIOCHEM SYST ECOL 2020. [DOI: 10.1016/j.bse.2020.104050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ngangoue MO, Ngameni B, Ambassa P, Chi GF, Wamba BEN, Ombito JO, Bojase GM, Fotso GW, Kuete V, Ngadjui BT. A phenanthridin-6( 5H)-one derivative and a lanostane-type triterpene with antibacterial properties from Anonidium mannii (Oliv). Engl. & Diels (Annonaceae). Nat Prod Res 2020; 35:4041-4050. [PMID: 32400185 DOI: 10.1080/14786419.2020.1758094] [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: 10/24/2022]
Abstract
The chemical investigation of Anonidium mannii root extract by column chromatography techniques led to the isolation of eight compounds among which two previously unreported compounds; a lanostane-type triterpene, lanosta-7,9(11),23-triene-3β,15α-diol 1 and an alkaloid, 9-hydroxy-8-methoxyphenanthridin-6(5H)-one 2 along with six known compounds: lanosta-7,9(11),24-triene-3β,21-diol 3, oxoanolobine 4, 3, 4-dihydroxybenzoic acid 5, stigmasterol 6, β-sitosterol 7 and 3-O-β-D-glucopyranosyl-β-stigmasterol 8. Their structures were established from spectral data, mainly HR-ESIMS, 1 D and 2 D NMR and by comparison with literature data. The crude root and stem bark extracts (AMR and AMB) and the isolated compounds (1-8) were tested against nine Gram-negative bacteria using rapid p-iodonitrotetrazolium chloride ≥97% (INT) microdilution technique. It was found that AMR, AMB and compound 5 were active against the nine tested bacteria with MIC values ranging from 64 to 1024 µg/mL. Compounds 1-4 had selective antibacterial activities whilst 6-8 were not active.
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Affiliation(s)
| | - Bathelemy Ngameni
- Faculty of Medicine and Biomedical Sciences, Department of Pharmacognosy and Pharmaceutical Chemistry, University of Yaoundé I, Yaoundé, Cameroon
| | - Pantaleon Ambassa
- Faculty of Science, Department of Organic Chemistry, University of Yaoundé 1, Yaoundé, Cameroon
| | - Godloves Fru Chi
- Faculty of Science, Department of Organic Chemistry, University of Yaoundé 1, Yaoundé, Cameroon
| | | | | | | | - Ghislain Wabo Fotso
- Faculty of Science, Department of Organic Chemistry, University of Yaoundé 1, Yaoundé, Cameroon
| | - Victor Kuete
- Faculty of Science, Department of Biochemistry, University of Dschang, Dschang, Cameroon
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Makong YS, Fotso GW, Mouthe GH, Lenta B, Rennert R, Sewald N, Arnold N, Wansi JD, Ngadjui BT. Bruceadysentoside A, a new pregnane glycoside and others secondary metabolites with cytotoxic activity from brucea antidysenterica J. F. Mill. (simaroubaceae). Nat Prod Res 2019; 35:2037-2043. [PMID: 31434501 DOI: 10.1080/14786419.2019.1655024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 10/26/2022]
Abstract
The chemical investigation of the root barks leaves and stem barks of Brucea antidysenterica J. F. Mill. (Simaroubaceae) led to the isolation of a new pregnane glycoside, named Bruceadysentoside A or 3-O-β-L-arabinopyranosyl-pregn-5-en-20-one (1) together with seventeen known compounds. Their structures were established from spectral data, mainly HRESIMS, 1 D and 2 D NMR and by comparison with literature data. Compounds 1, 2, 5, 6, 8, 10, 12 and 13 were tested in vitro for their effects on the viability of two different human cancer cell lines, namely prostate PC-3 adenocarcinoma cells and colorectal HT-29 adenocarcinoma cells. No substantial activities were recorded for 2, 10, 12 and 13 (up to 10 μM concentration). 1, 5 and 8 did not show strong anti-proliferative effects up to 100 μM, however, 6 exhibited a stronger anti-proliferative effect with IC50 values of ∼ 100 μM against PC-3 and ∼ 200 μM against HT-29.
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Affiliation(s)
- Yves Salomon Makong
- Department of Chemistry, Faculty of Science, University of Douala, Douala, Cameroon
| | - Ghislain Wabo Fotso
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, Yaounde, Cameroon
| | - Gervais Happi Mouthe
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, Yaounde, Cameroon
| | - Bruno Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé 1 1, Yaounde, Cameroon
| | - Robert Rennert
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Halle (Saale), Germany
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Norbert Arnold
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Halle (Saale), Germany
| | - Jean Duplex Wansi
- Department of Chemistry, Faculty of Science, University of Douala, Douala, Cameroon
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12
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Dawé A, Mbiantcha M, Yakai F, Jabeen A, Ali MS, Lateef M, Ngadjui BT. Flavonoids and triterpenes from Combretum fragrans with anti-inflammatory, antioxidant and antidiabetic potential. ACTA ACUST UNITED AC 2019; 73:211-219. [PMID: 29451865 DOI: 10.1515/znc-2017-0166] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 01/20/2018] [Indexed: 11/15/2022]
Abstract
Despite the well-documented benefits of Combretum fragrans in Cameroon, only few scientific works have been done on it. In this study we isolated eight compounds from the leaves extract of C. fragrans: velutin (1), belamcanidin (2), cirsilineol (3), cirsimaritin (4), 3β-acetoxy-20,24-epoxy-11,25-hydroxy-dammarane (5), combretin A (6), combretin B (7) and a mixture of arjunolic acid (8a) and asiatic acid (8b). Compounds 6 and 7 presented potent anti-inflammatory, antioxidant and antidiabetic activities. Compounds 1, 3, 5 and the mixture of 8a and 8b were significantly active, and compounds 2 and 4 presented moderate activity for reactive oxygen species inhibitory and free-radical scavenging. All compounds were isolated using chromatographic techniques; their structures were elucidated by spectroscopic techniques and their spectroscopic data compared with those of the literature. Anti-inflammatory activity was evaluated via the oxidative burst assay using a luminol-amplified chemiluminescence technique, antioxidant activity by free-radical scavenging activity (DPPH) and antidiabetic activity via α-glucosidase inhibition. All of the isolated compounds (1-8) were reported to exhibit significant antioxidant activity. Compounds 1, 3, and 5-8 exhibited potent chemiluminescence inhibition effect, and only compounds 6 and 7 inhibited α-glucosidase. Thus, C. fragrans can be used as an effective natural source of anti-inflammatory, antioxidant and antidiabetic compounds.
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Affiliation(s)
- Amadou Dawé
- Department of Chemistry, Higher Teachers Training College, University of Maroua, P.O. Box 55, Maroua, Cameroon, Phone: +00237-694457325, Fax: +00237-22 29 31 12
| | - Marius Mbiantcha
- Department of Animal Biology, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Fawai Yakai
- Department of Chemistry, Faculty of Science, University of Maroua, P.O. Box 46, Maroua, Cameroon
| | - Almas Jabeen
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Muhammad Shaiq Ali
- HEJ, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Mehreen Lateef
- Pharmaceutical Research Center, PCSIR Laboratories Karachi Complex, Karachi 75280, Pakistan
| | - Bonaventure Tchaleu Ngadjui
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
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Fotso GW, Mogue Kamdem L, Dube M, Fobofou SA, Ndjie Ebene A, Arnold N, Tchaleu Ngadjui B. Antimicrobial secondary metabolites from the stem barks and leaves of Monotes kerstingii Gilg (Dipterocarpaceae). Fitoterapia 2019; 137:104239. [PMID: 31201886 DOI: 10.1016/j.fitote.2019.104239] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [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: 05/17/2019] [Revised: 06/10/2019] [Accepted: 06/11/2019] [Indexed: 01/08/2023]
Abstract
In the search for bioactive natural products from the African flora, three previously undescribed compounds including one stilbene-coumarin derivative (1), one coumarin-carbinol (2) and one fatty glycoside (3) were isolated from the stem bark and leaves of Monotes kerstingii, together with sixteen known compounds (4-19). The structures of the isolated compounds were elucidated based on their NMR and MS spectroscopic data and by comparison of these data with those previously reported in the literature. Compounds 1-19 were screened for anthelmintic and antimicrobial activity. None of the compounds exhibited significant anthelmintic activity. However, compounds 4, 5, 8 and 14 displayed interesting antibacterial activity against B. subtilis at a concentration of 100 μM with respective inhibition percentages of 99, 79, 71 and 100%, respectively, compared to erythromycin used as positive control. In addition, at the same concentration, compound 6 showed remarkable antifungal activity against Septoria tritici with 93.6% growth inhibition and was found to be more active than the positive controls epoconazole and terbinafine displaying 76.6 and 84.3%, respectively .
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Affiliation(s)
- Ghislain Wabo Fotso
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon.
| | - Linda Mogue Kamdem
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Mthandazo Dube
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, D-06120 Halle (Saale), Germany
| | - Serge Alain Fobofou
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, D-06120 Halle (Saale), Germany
| | - Albert Ndjie Ebene
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Norbert Arnold
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, D-06120 Halle (Saale), Germany
| | - Bonaventure Tchaleu Ngadjui
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon.
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Mouthé Happi G, Tchaleu Ngadjui B, Green IR, Fogué Kouam S. Phytochemistry and pharmacology of the genus Entandrophragma over the 50 years from 1967 to 2018: a ‘golden’ overview. J Pharm Pharmacol 2018; 70:1431-1460. [DOI: 10.1111/jphp.13005] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 08/10/2018] [Indexed: 02/02/2023]
Abstract
Abstract
Objectives
For centuries, the genus Entandrophragma (Meliaceae), endemic to Africa, has been used in traditional medicine for the treatment of several illnesses. This review deals with large range of phytochemicals from the genus Entandrophragma and their pharmacological potentials covering the period from 1967 to 2018.
Key findings
Phytochemical investigations of the genus Entandrophragma led to the report of about 166 secondary metabolites which have been thoroughly summarized herein including some of their semisynthetic derivatives obtained from chemical transformations as well as their biological activities in the medicinal and agricultural domains. The limonoids or meliacins and their precursor called protolimonoids (protomeliacins) reported so far represent almost 69.28% of the total secondary metabolites obtained from the genus, and they display the most potent biological activities. Collectively, both classes of metabolites constitute the markers of Entandrophragma. However, squalene-type triterpenoids and sesquiterpenoids were reported only from the species E. cylindricum and therefore could be its chemotaxonomic markers.
Summary
The pharmacological investigations of the extracts of some species exhibited interesting results which support the traditional uses of these Entandrophragma plants in folk medicine. Some compounds revealed promising antiplasmodial and anti-inflammatory activities and deserve therefore further attention for new drug discovery.
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Affiliation(s)
- Gervais Mouthé Happi
- Department of Chemistry, Training College, University of Yaounde I, Yaounde, Cameroon
| | | | - Ivan Robert Green
- Department of Chemistry and Polymer Science, University of Stellenbosch, Stellenbosch, South Africa
| | - Simeon Fogué Kouam
- Department of Chemistry, Training College, University of Yaounde I, Yaounde, Cameroon
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Happi GM, Talontsi FM, Laatsch H, Zühlke S, Ngadjui BT, Spiteller M, Kouam SF. seco -Tiaminic acids B and C: Identification of two novel 3,4- seco -tirucallane triterpenoids isolated from the root of Entandrophragma congoënse (Meliaceae). Fitoterapia 2018; 124:17-22. [DOI: 10.1016/j.fitote.2017.10.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 10/02/2017] [Accepted: 10/03/2017] [Indexed: 10/18/2022]
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Tchoukoua A, Tabopda TK, Usukhbayar N, Kimura KI, Kwon E, Momma H, Koseki T, Shiono Y, Ngadjui BT. New triterpene saponins from the roots of Acacia macrostachya (Mimosaceae). Biosci Biotechnol Biochem 2017; 81:2261-2267. [PMID: 29052455 DOI: 10.1080/09168451.2017.1390393] [Citation(s) in RCA: 5] [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] [Indexed: 10/18/2022]
Abstract
Four new oleanane-type saponins, macrostachyaosides A, B, C, and D (1-4) were isolated from the roots of Acacia macrostachya. Their structures were elucidated on the basis of extensive 1D- and 2D-NMR data and HR-ESI-MS analyses. At concentrations of 100 μM of each compounds, none of the tested compounds caused a significant growth reduction against HL60 cells.
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Affiliation(s)
- Abdou Tchoukoua
- a Department of Organic Chemistry , University of Yaounde 1 , Yaounde , Cameroon.,b Faculty of Agriculture , Yamagata University , Tsuruoka , Japan
| | | | - Narandulam Usukhbayar
- c The United Graduate School of Agricultural Sciences , Iwate University , Morioka , Japan
| | - Ken-Ichi Kimura
- c The United Graduate School of Agricultural Sciences , Iwate University , Morioka , Japan
| | - Eunsang Kwon
- d Research and Analytical Center for Giant Molecules, Graduate School of Science , Tohoku University , Sendai , Japan
| | - Hiroyuki Momma
- d Research and Analytical Center for Giant Molecules, Graduate School of Science , Tohoku University , Sendai , Japan
| | - Takuya Koseki
- b Faculty of Agriculture , Yamagata University , Tsuruoka , Japan
| | - Yoshihito Shiono
- b Faculty of Agriculture , Yamagata University , Tsuruoka , Japan
| | - Bonaventure Tchaleu Ngadjui
- a Department of Organic Chemistry , University of Yaounde 1 , Yaounde , Cameroon.,e Department of Medicine and Traditional Pharmacopoeia, Faculty of Medicine and Biomedical Sciences , University of Yaounde 1 , Yaounde , Cameroon
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17
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Tchoukoua A, Kuiate Tabopda T, Konga Simo I, Uesugi S, Ohno M, Kimura KI, Kwon E, Momma H, Shiono Y, Ngadjui BT. Albidosides H and I, two new triterpene saponins from the barks of Acacia albida Del. (Mimosaceae). Nat Prod Res 2017; 32:924-932. [PMID: 28868920 DOI: 10.1080/14786419.2017.1371156] [Citation(s) in RCA: 2] [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: 10/18/2022]
Abstract
Two new triterpene saponins, albidosides H (1) and I (2), along with the three known saponins were isolated from the barks of Acacia albida. Their structures were elucidated on the basis of extensive 1D- and 2D-NMR studies and mass spectrometry. Albidosides H (1) and I (2) were assayed for their cytotoxicity against HeLa and HL60 cells using MTT method.
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Affiliation(s)
- Abdou Tchoukoua
- a Department of Organic Chemistry , University of Yaounde 1 , Yaounde , Cameroon.,b Faculty of Agriculture , Yamagata University , Tsuruoka , Japan
| | | | - Ingrid Konga Simo
- c Department of Chemistry , University of Dschang , Dschang , Cameroon
| | - Shota Uesugi
- d Laboratory of Chemical Biology , The United Graduate School of Agricultural Sciences, Iwate University , Morioka , Japan
| | - Misa Ohno
- d Laboratory of Chemical Biology , The United Graduate School of Agricultural Sciences, Iwate University , Morioka , Japan
| | - Ken-Ichi Kimura
- d Laboratory of Chemical Biology , The United Graduate School of Agricultural Sciences, Iwate University , Morioka , Japan.,e Graduate School of Agriculture , Iwate University , Morioka , Japan
| | - Eunsang Kwon
- f Research and Analytical Center for Giant Molecules, Graduate School of Science , Tohoku University , Sendai , Japan
| | - Hiroyuki Momma
- f Research and Analytical Center for Giant Molecules, Graduate School of Science , Tohoku University , Sendai , Japan
| | - Yoshihito Shiono
- b Faculty of Agriculture , Yamagata University , Tsuruoka , Japan
| | - Bonaventure Tchaleu Ngadjui
- a Department of Organic Chemistry , University of Yaounde 1 , Yaounde , Cameroon.,g Faculty of Medicine and Biomedical Sciences, Department of Medicine and Traditional Pharmacopoeia , University of Yaounde 1 , Yaounde , Cameroon
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Maffo T, Melong R, Nganteng DND, Wafo P, Ali MS, Ngadjui BT. Neomacrodione: a new degraded diterpenoid from the roots of Neoboutonia macrocalyx Beng (Euphorbiaceae). Nat Prod Res 2017; 32:85-90. [DOI: 10.1080/14786419.2017.1335729] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Timoleon Maffo
- Faculty of Science, Department of Organic Chemistry, University of Yaounde I, Yaoundé, Cameroon
- International Center for Chemical and Biological Sciences (ICCBS), University of Karachi, Karachi, Pakistan
| | - Raduis Melong
- Faculty of Science, Department of Organic Chemistry, University of Yaounde I, Yaoundé, Cameroon
- Institute for Organic and Biomolecular Chemistry, Georg-August University, Göttingen, Germany
| | - Dieu Ne Dort Nganteng
- Faculty of Science, Department of Organic Chemistry, University of Yaounde I, Yaoundé, Cameroon
| | - Pascal Wafo
- Higher Teachers’ Training College, University of Yaoundé I, Yaounde, Cameroon
| | - Muhammad Shaiq Ali
- International Center for Chemical and Biological Sciences (ICCBS), University of Karachi, Karachi, Pakistan
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Ngameni B, Fotso GW, Ambassa P, Kamga J, Dastan A, Ngadjui BT. Hemisynthesis and Spectroscopic Characterization of Three New Chalcone Derivatives from Dorstenia barteri. Chem Nat Compd 2017. [DOI: 10.1007/s10600-017-1962-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Tchoukoua A, Tabopda TK, Uesugi S, Ohno M, Kimura KI, Kwon E, Momma H, Horo I, Çalişkan ÖA, Shiono Y, Ngadjui BT. Triterpene saponins from the roots of Acacia albida Del. (Mimosaceae). Phytochemistry 2017; 136:31-38. [PMID: 28043655 DOI: 10.1016/j.phytochem.2016.12.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 12/21/2016] [Accepted: 12/22/2016] [Indexed: 06/06/2023]
Abstract
Seven previously undescribed bidesmosidic triterpenoid saponins named albidosides A - G, were isolated from a methanol extract of the roots of Acacia albida. Their structures were elucidated using 1D and 2D NMR spectroscopy and mass spectrometry and determined to be bidesmosides of oleanolic acid and of 16α-hydroxyoleanolic acid. Albidosides B - G were assayed for their cytotoxicity against HeLa and HL60 cells using MTT method and microscopic observation.
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Affiliation(s)
- Abdou Tchoukoua
- Department of Organic Chemistry, University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon; Faculty of Agriculture, Yamagata University, 1-23, Wakaba-machi, Tsuruoka, Yamagata, 997-8555, Japan
| | - Turibio Kuiate Tabopda
- Department of Organic Chemistry, University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon.
| | - Shota Uesugi
- Laboratory of Chemical Biology, The United Graduate School of Agricultural Sciences, Iwate University, Morioka, Iwate 020-8550, Japan
| | - Misa Ohno
- Laboratory of Chemical Biology, The United Graduate School of Agricultural Sciences, Iwate University, Morioka, Iwate 020-8550, Japan
| | - Ken-Ichi Kimura
- Laboratory of Chemical Biology, The United Graduate School of Agricultural Sciences, Iwate University, Morioka, Iwate 020-8550, Japan; Graduate School of Agriculture, Iwate University, Morioka, Iwate 020-8550, Japan
| | - Eunsang Kwon
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Hiroyuki Momma
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Ibrahim Horo
- Department of Chemistry, Faculty of Science, Ege University, 35100, Bornova, İzmir, Turkey
| | - Özgen Alankuş Çalişkan
- Department of Chemistry, Faculty of Science, Ege University, 35100, Bornova, İzmir, Turkey
| | - Yoshihito Shiono
- Faculty of Agriculture, Yamagata University, 1-23, Wakaba-machi, Tsuruoka, Yamagata, 997-8555, Japan.
| | - Bonaventure Tchaleu Ngadjui
- Department of Organic Chemistry, University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon; Department of Medicine and Traditional Pharmacopoeia, Faculty of Medicine and Biomedical Sciences, University of Yaounde 1, P.O. Box 1364, Yaoundé, Cameroon.
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21
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Dawé A, Mbiantcha M, Fongang Y, Nana WY, Yakai F, Ateufack G, Shaiq MA, Lubna I, Lateef M, Ngadjui BT. Piptadenin, a Novel 3,4-Secooleanane Triterpene and Piptadenamide, a New Ceramide from the Stem Bark of Piptadeniastrum africanum (Hook.f.) Brenan. Chem Biodivers 2017; 14. [PMID: 27491939 DOI: 10.1002/cbdv.201600215] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [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: 06/16/2016] [Accepted: 08/02/2016] [Indexed: 11/08/2022]
Abstract
Piptadenin (1), a new triterpene along with piptadenamide (10), a new ceramide, have been isolated from the AcOEt-soluble fraction of the MeOH extract of the stem bark of Piptadeniastrum africanum along with nine known compounds, 1-O-[(3β,22β)-3,22-dihydroxy-28-oxoolean-12-en-28-yl]-β-d-glucopyranose (2), 22β-hydroxyoleanic acid (3), oleanic acid (4), lupeol (5), betulinic acid (6), 5α-stigmasta-7,22-dien-3β-ol (7), 5α-stigmasta-7,22-dien-3-one (8), (3β)-stigmast-5-en-3-yl β-d-glucopyranoside (9) and 2,3-dihydroxypropyl hexacosanoate (11). Except for compound 11, all the isolated compounds are reported for the first time from this plant. The structures of the isolated compounds were elucidated by spectroscopic data including 1D and 2D NMR. The pure compounds 1 - 11 were subjected to the pharmacological screening and compounds 2, 5 - 7 and 9 exhibited potent urease inhibitory activity with IC50 value of 25.8, 28.9, 30.1, 31.8 and 32.7 μm, respectively, whereas compound 1 showed moderate activity (IC50 = 98.7 μm). The potent urease inhibitory activity supplemented the previous literature reports and medicinal uses of this plant.
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Affiliation(s)
- Amadou Dawé
- Department of Chemistry, Higher Teachers Training College, University of Maroua, P.O. Box 55, Maroua, Cameroon
| | - Marius Mbiantcha
- Department of Biology, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Yannick Fongang
- Department of Chemistry, Higher Teachers Training College, University of Maroua, P.O. Box 55, Maroua, Cameroon
| | - William Yosseu Nana
- Department of Biology, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Fawai Yakai
- Department of Chemistry, Higher Teachers Training College, University of Maroua, P.O. Box 55, Maroua, Cameroon
| | - Gilbert Ateufack
- Department of Biology, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Muhammad Ali Shaiq
- International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Iqbal Lubna
- PCSIR Laboratories Karachi Complex, Pharmaceutical Research Center, Karachi, 75280, Pakistan
| | - Mehreen Lateef
- PCSIR Laboratories Karachi Complex, Pharmaceutical Research Center, Karachi, 75280, Pakistan
| | - Bonaventure Tchaleu Ngadjui
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
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Tchoukoua A, Kuiate Tabopda T, Uesugi S, Kimura KI, Kwon E, Momma H, Ngadjui BT, Koseki T, Shiono Y. Two new 5-deoxyflavan-3,4-diol glucosides from roots of Albizia chevalieri. Magn Reson Chem 2016; 54:893-896. [PMID: 27546306 DOI: 10.1002/mrc.4504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 08/13/2016] [Accepted: 08/17/2016] [Indexed: 06/06/2023]
Abstract
Phytochemical investigation of the roots of Albizia chevalieri led to the isolation of two new 5-deoxyflavan-3,4-diol glucosides from roots of A. chevalieri, Chevalieriflavanosides A and B. Their structures were established by 2D NMR techniques, UV, IR, CD, and mass spectrometry. Cytotoxicity of the two compounds was evaluated against acute promyelocytic leukemia HL60 cells. The antibacterial activities of 1 and 2 also were evaluated against Pseudomonas aeruginosa and Staphylococcus aureus using the agar diffusion test. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Abdou Tchoukoua
- Département de Chimie Organique, Université de Yaoundé 1, Yaoundé, Cameroun
- Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata, Japan
| | | | - Shota Uesugi
- The United Graduate School of Agricultural Sciences, Iwate University, Morioka, Iwate, Japan
| | - Ken-Ichi Kimura
- The United Graduate School of Agricultural Sciences, Iwate University, Morioka, Iwate, Japan
| | - Eunsang Kwon
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
| | - Hiroyuki Momma
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
| | | | - Takuya Koseki
- Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata, Japan
| | - Yoshihito Shiono
- Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata, Japan.
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Dawe A, Kapche GDWF, Bankeu JJK, Fawai Y, Ali MS, Ngadjui BT. Combretins A and B, New Cycloartane-Type Triterpenes fromCombretum fragrans. Helv Chim Acta 2016. [DOI: 10.1002/hlca.201600053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Amadou Dawe
- Department of Chemistry; Higher Teachers' Training College; University of Maroua; P.O. Box 55 Maroua Cameroon
| | | | - Jean Jules Kezetas Bankeu
- Department of Chemistry; Faculty of Science; The University of Bamenda; P.O. Box 39 Bambili Cameroon
| | - Yakai Fawai
- Department of Chemistry; Higher Teachers' Training College; University of Maroua; P.O. Box 55 Maroua Cameroon
| | - Muhammad Shaiq Ali
- International Center for Chemical and Biological Sciences; University of Karachi; Karachi 75270 Pakistan
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24
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Tabopda TK, Mitaine-Offer AC, Paululat T, Delemasure S, Dutartre P, Ngadjui BT, Lacaille-Dubois MA. Steroidal saponins from Chlorophytum deistelianum. Phytochemistry 2016; 126:34-40. [PMID: 27012932 DOI: 10.1016/j.phytochem.2016.03.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Revised: 03/04/2016] [Accepted: 03/07/2016] [Indexed: 06/05/2023]
Abstract
Phytochemical investigation of the aerial parts of Chlorophytum deistelianum led to the isolation of four previously undescribed steroidal saponins called chlorodeistelianosides A-D with five known ones. Their structures were established mainly by extensive 1D and 2D NMR spectroscopic techniques and mass spectrometry as (25R)-3β-[(β-D-glucopyranosyl-(1→3)-[α-L-rhamnopyranosyl-(1→4)]-β-D-xylopyranosyl-(1→3)-[β-D-glucopyranosyl-(1→2)]-β-D-glucopyranosyl-(1→4)-β-D-galactopyranosyl)oxy]-5α-spirostan-12-one, (24S,25S)-24-[(β-D-glucopyranosyl)oxy]-3β-[(β-d-glucopyranosyl-(1→2)-[β-D-xylopyranosyl-(1→3)]-β-D-glucopyranosyl-(1→4)-β-D-galactopyranosyl)oxy]-5α-spirostan-12-one, (25R)-26-[(β-D-glucopyranosyl)oxy]-2α-hydroxy-22α-methoxy-5α-furostan-3β-yl β-D-glucopyranosyl-(1→2)-[β-D-xylopyranosyl-(1→3)]-β-D-glucopyranosyl-(1→4)-β-D-galactopyranoside, and (25R)-26-[(β-D-glucopyranosyl)oxy]-3β-[(β-D-glucopyranosyl-(1→2)-[β-D-xylopyranosyl-(1→3)]-β-D-glucopyranosyl-(1→4)-β-D-galactopyranosyl)oxy]-5α-furost-20(22)-en-12-one. Cytotoxicity of most compounds was evaluated against one human cancer cell line (SW480) and one rat cardiomyoblast cell line (H9c2). Among them, three known spirostane-type glycosides exhibited cytotoxicity on both cell lines with IC50 ranging from 8 to 10 μM.
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Affiliation(s)
- Turibio Kuiate Tabopda
- Laboratoire de Pharmacognosie, EA 4267/UFC, UFR des Sciences de Santé, Université de Bourgogne Franche-Comté, 7, Bd. Jeanne d'Arc, BP 87900, 21079 Dijon Cedex, France; Département de Chimie Organique, Université de Yaoundé 1, BP 812 Yaoundé, Cameroon
| | - Anne-Claire Mitaine-Offer
- Laboratoire de Pharmacognosie, EA 4267/UFC, UFR des Sciences de Santé, Université de Bourgogne Franche-Comté, 7, Bd. Jeanne d'Arc, BP 87900, 21079 Dijon Cedex, France
| | - Thomas Paululat
- Universität Siegen, FB8, OC-II (AK Ihmels), Adolf-Reichwein-Strasse 2, D-57068 Siegen, Germany
| | - Stéphanie Delemasure
- Cohiro, UFR des Sciences de Santé, 7, Bd. Jeanne d'Arc, BP 87900, 21079 Dijon Cedex, France
| | - Patrick Dutartre
- Cohiro, UFR des Sciences de Santé, 7, Bd. Jeanne d'Arc, BP 87900, 21079 Dijon Cedex, France
| | | | - Marie-Aleth Lacaille-Dubois
- Laboratoire de Pharmacognosie, EA 4267/UFC, UFR des Sciences de Santé, Université de Bourgogne Franche-Comté, 7, Bd. Jeanne d'Arc, BP 87900, 21079 Dijon Cedex, France.
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Ngoupayo J, Tabopda TK, Ali MS, Ngadjui BT, Lacaille-Dubois MA. Antioxidant stilbenoid and flavanonol from stem of Erythrophleum suaveolens (Guill. & Perr.). Magn Reson Chem 2015; 53:612-615. [PMID: 26017640 DOI: 10.1002/mrc.4253] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 03/23/2015] [Accepted: 03/30/2015] [Indexed: 06/04/2023]
Affiliation(s)
- Joseph Ngoupayo
- Département de Pharmacognosie et de Chimie Pharmaceutique, Faculté de Médecine et des Sciences Biomédicales, Université de Yaoundé 1, BP, 1364, Yaoundé, Cameroon
| | | | - Muhammad Shaiq Ali
- H.E.J. Research Institute of Chemistry, University of Karachi, Karachi, 75270, Pakistan
| | | | - Marie-Aleth Lacaille-Dubois
- Laboratoire de Pharmacognosie, UMIB, UPRES-EA 3660, Faculté de Pharmacie, Université de Bourgogne, 7, Bd. Jeanne d'Arc, BP 87900, 21079, Dijon Cedex, France
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26
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Kouam SF, Ngouonpe AW, Lamshöft M, Talontsi FM, Bauer JO, Strohmann C, Ngadjui BT, Laatsch H, Spiteller M. Indolosesquiterpene alkaloids from the Cameroonian medicinal plant Polyalthia oliveri (Annonaceae). Phytochemistry 2014; 105:52-59. [PMID: 25039009 DOI: 10.1016/j.phytochem.2014.06.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 06/19/2014] [Accepted: 06/20/2014] [Indexed: 06/03/2023]
Abstract
The stem bark of Polyalthia oliveri was screened for its chemical constituents using liquid chromatography high resolution mass spectrometry resulting in the isolation of three indolosesquiterpene alkaloids named 8α-polyveolinone (1), N-acetyl-8α-polyveolinone (2) and N-acetyl-polyveoline (3), together with three known compounds, dehydro-O-methylisopiline (4), N-methylurabaine (5) and polycarpol (6). The structures of the compounds were elucidated by means of high resolution mass spectrometry and different NMR techniques and chemical transformations. Their absolute configurations were assigned by ab-initio calculation of CD and ORD data (for 2 and 3) and X-ray diffraction analysis (for 2). Compounds 2 and 3 exhibited moderate antiplasmodial activity against erythrocytic stages of chloroquine-sensitive Plasmodium falciparum NF54 strain and low cytotoxicity on rat skeletal myoblast (L6) cell line.
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Affiliation(s)
- Simeon Fogue Kouam
- Department of Chemistry, Higher Teachers' Training College, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon; Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany.
| | - Alain Wembe Ngouonpe
- Department of Chemistry, Higher Teachers' Training College, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon
| | - Marc Lamshöft
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
| | - Ferdinand Mouafo Talontsi
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
| | - Jonathan O Bauer
- Inorganic Chemistry, Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
| | - Carsten Strohmann
- Inorganic Chemistry, Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
| | | | - Hartmut Laatsch
- Institute for Organic and Biomolecular Chemistry, Georg-August University, Tammannstrasse 2, D-37077 Göttingen, Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany.
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Chenda LBN, Kouam SF, Lamshöft M, Kusari S, Talontsi FM, Ngadjui BT, Spiteller M. Isolation and characterization of six labdane diterpenes and one pregnane steroid of Turraeanthus africanus. Phytochemistry 2014; 103:137-144. [PMID: 24735827 DOI: 10.1016/j.phytochem.2014.03.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2013] [Revised: 03/18/2014] [Accepted: 03/20/2014] [Indexed: 06/03/2023]
Abstract
Six labdane diterpene derivatives, named turraeanins F-J (3-6, 8) and epi-turraeanin J (7), and a pregnane steroid derivative named turraeasterodionene (2), were isolated by preparative high performance liquid chromatography together with thirteen known compounds from the Cameroonian medicinal plant Turraeanthus africanus. Their structures were elucidated by means of nuclear magnetic resonance spectroscopy and high-resolution mass spectrometry in conjunction with the published data for the analogs, as well as the fragmentation patterns of each compound. Most of the known compounds were obtained for the first time from this plant. The compounds (2-7) were tested for their antibacterial efficacies against both Gram-positive and Gram-negative bacteria, including some clinically-important Risk group 2 human pathogens. Compound 4 exhibited the most pronounced antibacterial effectiveness comparable to standard reference streptomycin, with more potency against Gram-positive than Gram-negative bacteria. By comparing compounds 3, 4 and 5, a tentative structure-activity relationship could be drawn; selected oxidations at C-16 and C-18 drastically reduced the antibacterial efficacy of the parent compound (4). These results revealed the potential of compound 4 as a suitable antibacterial lead compound that might be used for further development of other derivatives to increase the antimicrobial efficacy.
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Affiliation(s)
- Laurice Bracine Njanang Chenda
- Department of Chemistry, Higher Teachers' Training College, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon; Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
| | - Simeon Fogue Kouam
- Department of Chemistry, Higher Teachers' Training College, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon.
| | - Marc Lamshöft
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
| | - Souvik Kusari
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
| | - Ferdinand Mouafo Talontsi
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
| | | | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany.
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28
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Tabopda TK, Mitaine-Offer AC, Tanaka C, Miyamoto T, Mirjolet JF, Duchamp O, Ngadjui BT, Lacaille-Dubois MA. Steroidal saponins from Dioscorea preussii. Fitoterapia 2014; 97:198-203. [PMID: 24928475 DOI: 10.1016/j.fitote.2014.06.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [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: 04/05/2014] [Revised: 06/02/2014] [Accepted: 06/03/2014] [Indexed: 11/30/2022]
Abstract
Three new steroidal saponins, named diospreussinosides A-C (1-3), along with two known ones (4, 5) were isolated from rhizomes of Dioscorea preussii. Their structures were elucidated mainly by 1D and 2D NMR spectroscopic analysis and mass spectrometry as (25S)-17α,25-dihydroxyspirost-5-en-3β-yl-O-α-L-rhamnopyranosyl-(1→4)-α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranoside (1), (25S)-17α,25-dihydroxyspirost-5-en-3β-yl-O-α-L-rhamnopyranosyl-(1→4)-α-L-rhamnopyranosyl-(1→4)-[α-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranoside (2), and (24S,25R)-17α,24,25-trihydroxyspirost-5-en-3β-yl-O-α-L-rhamnopyranosyl-(1→4)-α-L-rhamnopyranosyl-(1→4)-[α-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranoside (3). The spirostane-type skeleton of compound 3 possessing an unusual dihydroxylation pattern on the F-ring is reported for the first time. Cytotoxicity of compounds 2-5 was evaluated against two human colon carcinoma cell lines (HT-29 and HCT 116).
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Affiliation(s)
- Turibio Kuiate Tabopda
- EA 4267 (FDE/UFC), Laboratoire de Pharmacognosie, Faculté de Pharmacie, Université de Bourgogne, 7, Bd. Jeanne d'Arc, BP 87900, 21079 Dijon CEDEX, France; Département de Chimie Organique, Université de Yaoundé 1, BP 812, Yaoundé, Cameroun
| | - Anne-Claire Mitaine-Offer
- EA 4267 (FDE/UFC), Laboratoire de Pharmacognosie, Faculté de Pharmacie, Université de Bourgogne, 7, Bd. Jeanne d'Arc, BP 87900, 21079 Dijon CEDEX, France
| | - Chiaki Tanaka
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Tomofumi Miyamoto
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | | | - Olivier Duchamp
- Oncodesign, 20 rue Jean Mazen, BP 27627, 21076 Dijon CEDEX, France
| | | | - Marie-Aleth Lacaille-Dubois
- EA 4267 (FDE/UFC), Laboratoire de Pharmacognosie, Faculté de Pharmacie, Université de Bourgogne, 7, Bd. Jeanne d'Arc, BP 87900, 21079 Dijon CEDEX, France.
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Shiono Y, Shibuya F, Murayama T, Koseki T, Poumale Poumale HM, Tchaleu Ngadjui B. A Polyketide Metabolite from an Endophytic Fusarium equiseti in a Medicinal Plant. ACTA ACUST UNITED AC 2014. [DOI: 10.5560/znb.2013-3014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
A new polyketide, fusaequisin A (1), was isolated from rice cultures of Fusarium equiseti SF-3-17, an endophytic fungus previously discovered during screening of medicinal plants in Cameroon. The structure of 1 was determined using spectroscopic methods. Fusaequisin A (1) exhibited moderate antimicrobial activity against Staphylococcus aureus NBRC 13276 and Pseudomonas aeruginosa ATCC 15442 at a concentration of 200 μg per disk.
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Affiliation(s)
- Yoshihito Shiono
- Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata 997-8555, Japan
| | - Fumiaki Shibuya
- Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata 997-8555, Japan
| | - Tetsuya Murayama
- Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata 997-8555, Japan
| | - Takuya Koseki
- Department of Food, Life, and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata 997-8555, Japan
| | | | - Bonaventure Tchaleu Ngadjui
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P. O. Box 812, Yaoundé, Cameroon
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Tchoukoua A, Sandjo LP, Keumedjio F, Ngadjui BT, Kirsch G. Triumfettamide B, a New Ceramide from the Twigs of Triumfetta rhomboidea. Chem Nat Compd 2013. [DOI: 10.1007/s10600-013-0753-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Dzoyem JP, Hamamoto H, Ngameni B, Ngadjui BT, Sekimizu K. Antimicrobial action mechanism of flavonoids from Dorstenia species. Drug Discov Ther 2013; 7:66-72. [PMID: 23715504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Naturally occurring flavonoids have been reported to possess antimicrobial activity against a wide range of pathogens. However, the antimicrobial action mechanism of these compounds has not yet been elucidated. This study investigated the mechanism underlying the antibacterial activity of four flavonoids: 6,8-diprenyleriodictyol (1), isobavachalcone (2), 6-prenylapigenin (3) and 4-hydroxylonchocarpin (4). In addition, the toxicity of these compounds was evaluated. Determination of the minimum inhibitory concentrations (MICs) was performed by microbroth dilution method. Radiolabeled thymidine, uridine, and methionine were used to evaluate the effect of the compounds on the biosynthesis of DNA, RNA, and proteins while the sensitive cyanine dye DiS-C3-(5) (3,3'-dipropylthiadicarbocyanine iodide) was used for the effect on membrane potential. Bactericidal/bacteriolysis activities were performed by time-kill kinetic method. In the toxicity study, the numbers of survivors was recorded after injection of compounds into the hemolymph of silkworm larvae. Compounds showed significant antibacterial activity against Staphylococcus aureus including methicillin-resistant S. aureus (MRSA) strains with MICs values ranged between 0.5-128 μg/mL. Depolarization of membrane and inhibition of DNA, RNA, and proteins synthesis were observed in S. aureus when treated with those flavonoids. At 5-fold minimum inhibitory concentration, compounds reduced rapidly the bacterial cell density and caused lysis of S. aureus. Compounds 1, 2, and 4 did not show obvious toxic effects in silkworm larvae up to 625 μg/g of body weight. Flavonoids from Dorstenia species, 6,8-diprenyleriodictyol, isobavachalcone, and 4-hydroxylonchocarpin are bactericidal compounds. They cause damage of cell membrane, leading to the inhibition of macromolecular synthesis. Taking into account the in vivo safety and their significant antimicrobial potency, these flavonoids are promising leads for further drug development.
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Affiliation(s)
- Jean Paul Dzoyem
- Laboratory of Microbiology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
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Tabopda TK, Mitaine-Offer AC, Miyamoto T, Tanaka C, Ngadjui BT, Lacaille-Dubois MA. Secondary Metabolites from Polar Fractions of Piper umbellatum. Nat Prod Commun 2012. [DOI: 10.1177/1934578x1200700511] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Seven known secondary metabolites were isolated from the methanol extract of the branches of Piper umbellatum. The identification of these compounds was mainly achieved by 2D NMR spectroscopic techniques and FAB-MS. Among them, the known cepharadiones A and B can be considered as chemotaxonomic markers of the genus Piper.
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Affiliation(s)
- Turibio Kuiate Tabopda
- EA 4267-FDE/UFC, Laboratoire de Pharmacognosie, Faculté de Pharmacie, Université de Bourgogne, 7, Bd Jeanne d'Arc, BP 87900, 21079 Dijon cedex, France
- Département de Chimie Organique, Université de Yaoundé I, BP 812 Yaoundé Cameroun
| | - Anne-Claire Mitaine-Offer
- EA 4267-FDE/UFC, Laboratoire de Pharmacognosie, Faculté de Pharmacie, Université de Bourgogne, 7, Bd Jeanne d'Arc, BP 87900, 21079 Dijon cedex, France
| | - Tomofumi Miyamoto
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Chiaki Tanaka
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | | | - Marie-Aleth Lacaille-Dubois
- EA 4267-FDE/UFC, Laboratoire de Pharmacognosie, Faculté de Pharmacie, Université de Bourgogne, 7, Bd Jeanne d'Arc, BP 87900, 21079 Dijon cedex, France
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Nana F, Sandjo LP, Keumedjio F, Ambassa P, Malik R, Kuete V, Rincheval V, Choudhary MI, Ngadjui BT. Ceramides and cytotoxic constituents from Ficus glumosa Del. (Moraceae). J BRAZIL CHEM SOC 2012. [DOI: 10.1590/s0103-50532012000300015] [Citation(s) in RCA: 22] [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] [Indexed: 11/21/2022] Open
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Tabopda TK, Mitaine-Offer AC, Miyamoto T, Tanaka C, Mirjolet JF, Duchamp O, Ngadjui BT, Lacaille-Dubois MA. Triterpenoid saponins from Hydrocotyle bonariensis Lam. Phytochemistry 2012; 73:142-147. [PMID: 22019087 DOI: 10.1016/j.phytochem.2011.08.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2011] [Revised: 08/26/2011] [Accepted: 08/31/2011] [Indexed: 05/31/2023]
Abstract
Phytochemical investigation of the under-ground parts of Hydrocotyle bonariensis led to the isolation of five oleanane-type triterpenoid saponins, 3-O-{β-D-glucopyranosyl-(1 → 2)-[α-L-arabinopyranosyl-(1 → 3)]-β-D-glucuronopyranosyl}-21-O-(2-methylbutyroyl)-22-O-acetyl-R(1)-barrigenol, 3-O-{β-D-glucopyranosyl-(1 → 2)-[α-L-arabinopyranosyl-(1 → 3)]-β-D-glucuronopyranosyl}-21-O-(2-methylbutyroyl)-28-O-acetyl-R(1)-barrigenol, 3-O-{β-D-glucopyranosyl-(1 → 2)-[α-L-arabinopyranosyl-(1 → 3)]-β-D-glucuronopyranosyl}-21-O-acetyl-R(1)-barrigenol, 3-O-{β-D-glucopyranosyl-(1 → 2)-[α-L-arabinopyranosyl-(1 → 3)]-β-D-glucuronopyranosyl}-R(1)-barrigenol, and 3-O-{β-D-glucopyranosyl-(1 → 2)-[α-L-arabinopyranosyl-(1 → 3)]-β-D-glucuronopyranosyl}-22-O-(2-methylbutyroyl)-A(1)-barrigenol, together with the known saniculoside-R1. Their structures were established by 2D NMR techniques and mass spectrometry. Six compounds were evaluated against two human colon cancer cell lines, HCT 116 and HT-29. Two compounds showed weak cytotoxicity with IC(50) 24.1 and 24.0, 83.0 and 83.6 μM against HT-29 and HCT 116, respectively.
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Affiliation(s)
- Turibio Kuiate Tabopda
- Laboratoire de Pharmacognosie, UMIB, UPRES-EA 3660, Faculté de Pharmacie, Université de Bourgogne, 7 Bd Jeanne d'Arc, BP 87900, 21079 Dijon Cedex, France
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Sob SVT, Wabo HK, Tang CP, Tane P, Ngadjui BT, Ye Y. Phenol esters and other constituents from the stem barks of Stereospermum acuminatissimum. J Asian Nat Prod Res 2011; 13:1128-1134. [PMID: 22008010 DOI: 10.1080/10286020.2011.619182] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [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
A new ester, 2-(4'-hydroxyphenyl)ethyl dotriacontanoate (1), and a new inseparable mixture of octacosan-1,28-dioldiferulate and triacontan-1,30-dioldiferulate (2) were isolated from the stem barks of Stereospermum acuminatissimum, along with 24 known compounds including 4 triterpenoids, 11 anthraquinones, 2 lignans, 3 phenylpropanoids, 2 4-hydroxyphenethyl esters, 1 methoxyphenol, and 1 iridoid. The structures of the new metabolites were determined with the help of spectroscopic data including extensive 2D NMR spectroscopy. The known compounds were identified by comparison of their physical and spectroscopic data with those reported in the literature. The compounds were tested against Candida albicans ATCC 24433, C. albicans ATCC 90028, Candida glabrata ATCC 90030, Candida krusei ATCC 6258, and Candida parapsilosis ATCC 22019. Some of them were moderately active.
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Abstract
A new aldol ester named 17-O-triacontanoylheptadecanal (1) was isolated from the aerial part of Mimosa invisa (Mimosaceae) together with eight known compounds identified as β-sitosterol (2), α-amyrine (3), lupeol (4), 4'-O-methylepinumisoflavone (5), alpinumisoflavone (6), betulinic acid (7), 3-O-β-D-glucopyranoside of sitosterol (8) and epirobinetinidol (9). The structures of compounds were determined on the basis of NMR and mass spectrometry data as well as by comparing the data reported in the literatures. The antimicrobial activities of the crude extract and compounds 1 and 9 were investigated against seven microbial species. The natural products showed moderate activities compared to that of the crude extract.
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Affiliation(s)
- Frederic Nana
- Department of Organic Chemistry, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
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Tabopda TK, Mitaine-Offer AC, Miyamoto T, Tanaka C, Mirjolet JF, Duchamp O, Ngadjui BT, Lacaille-Dubois MA. Acylated Triterpene Saponins from Atroxima libericaStapf. Helv Chim Acta 2011. [DOI: 10.1002/hlca.201100147] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Poumale HMP, Awoussong KP, Randrianasolo R, Simo CCF, Ngadjui BT, Shiono Y. Long-chain alkanoic acid esters of lupeol from Dorstenia harmsiana Engl. (Moraceae). Nat Prod Res 2011; 26:749-55. [DOI: 10.1080/14786419.2010.551769] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Herve Martial P. Poumale
- a Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , PO Box 812, Yaoundé , Cameroon
- b Department of Bioresource Engineering, Faculty of Agriculture , Yamagata University , Tsuruoka , Yamagata 997-8555 , Japan
| | - Kenzo Patrice Awoussong
- a Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , PO Box 812, Yaoundé , Cameroon
| | - Rivoarison Randrianasolo
- c Department of Organic Chemistry, Faculty of Science , University of Antananarivo , PO Box 906, Antananarivo 101 , Madagascar
| | - Christophe Colombe F. Simo
- a Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , PO Box 812, Yaoundé , Cameroon
| | - Bonaventure Tchaleu Ngadjui
- a Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , PO Box 812, Yaoundé , Cameroon
| | - Yoshihito Shiono
- b Department of Bioresource Engineering, Faculty of Agriculture , Yamagata University , Tsuruoka , Yamagata 997-8555 , Japan
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Happi EN, Waffo AF, Wansi JD, Ngadjui BT, Sewald N. O-prenylated acridone alkaloids from the stems of Balsamocitrus paniculata (Rutaceae). Planta Med 2011; 77:934-938. [PMID: 21243586 DOI: 10.1055/s-0030-1250692] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Two new O-prenylated acridone alkaloids, balsacridone A (1) and B (2), together with eighteen known compounds were isolated from the methanol extract from the stems of Balsamocitrus paniculata, a Cameroonian medicinal plant. The structures of all compounds were determined by comprehensive analyses of their 1D and 2D NMR, mass spectral (EI and ESI) data, and chemical reactions. N-methyl-6-methoxybenzoxazolinone (16) was isolated for the first time from a natural source while compounds 13, 14, and 15 for the first time from this genus. Pure compounds were tested for their activity against bacteria, fungi, and plant pathogen oomycetes, using the paper disk agar diffusion assay. The agar diffusion test delivered low to missing antimicrobial activities, corresponding to MICs > 1 mg/mL. However, compounds 1-15 exhibited a strong suppressive effect on phagocytosis response upon activation with serum opsonized zymosan in the range of IC50 = 0.5-7.2 μM, and the acridone alkaloids (1-5), N-trans-p-coumaroyltyramine (13), and N-trans-pcoumaroyloctopamine (14) displayed weak cytotoxic activity against the human Caucasian prostate adenocarcinoma cell line PC-3, with IC₅₀ values ranging from 69.8 to 99.0 μM.
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Fokunang CN, Ndikum V, Tabi OY, Jiofack RB, Ngameni B, Guedje NM, Tembe-Fokunang EA, Tomkins P, Barkwan S, Kechia F, Asongalem E, Ngoupayou J, Torimiro NJ, Gonsu KH, Sielinou V, Ngadjui BT, Angwafor F, Nkongmeneck A, Abena OM, Ngogang J, Asonganyi T, Colizzi V, Lohoue J, Kamsu-Kom. Traditional medicine: past, present and future research and development prospects and integration in the National Health System of Cameroon. Afr J Tradit Complement Altern Med 2011; 8:284-95. [PMID: 22468007 PMCID: PMC3252219 DOI: 10.4314/ajtcam.v8i3.65276] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Traditional medicine refers to health practices, approaches, knowledge and beliefs incorporating plant, animal and mineral based medicines, spiritual therapies, manual techniques and exercises, applied singularly or in combination to treat, diagnose and prevent illnesses or maintain well-being. In the last decade traditional medicine has become very popular in Cameroon, partly due to the long unsustainable economic situation in the country. The high cost of drugs and increase in drug resistance to common diseases like malaria, bacteria infections and other sexually transmitted diseases has caused the therapeutic approach to alternative traditional medicine as an option for concerted search for new chemical entities (NCE). The World Health Organisation (WHO) in collaboration with the Cameroon Government has put in place a strategic platform for the practice and development of TM in Cameroon. This platform aims at harmonizing the traditional medicine practice in the country, create a synergy between TM and modern medicine and to institutionalize a more harmonized integrated TM practices by the year 2012 in Cameroon. An overview of the practice of TM past, present and future perspectives that underpins the role in sustainable poverty alleviation has been discussed. This study gives an insight into the strategic plan and road map set up by the Government of Cameroon for the organisational framework and research platform for the practice and development of TM, and the global partnership involving the management of TM in the country.
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Yousuf S, Kamdem RST, Wafo P, Ngadjui BT, Fun HK. A cocrystal of 3α-hy-droxy-tirucalla-8,24-dien-21-oic acid and 3β-fluoro-tirucalla-7,24-dien-21-oic acid (0.897:0.103). Acta Crystallogr Sect E Struct Rep Online 2011; 67:o1015-6. [PMID: 21754032 PMCID: PMC3099936 DOI: 10.1107/s1600536811011159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Accepted: 03/25/2011] [Indexed: 12/04/2022]
Abstract
The title compound, 0.897C30H48O3.0.103C30H47O2F is a co-crystal of two triterpenes isolated from the resin of Canarium schweinfurthiiand Engl. Both triterpenes consists of four trans-fused rings having chair/half-chair/half-chair and envelope conformations. The molecular conformations are stabilized by intramolecular C—H⋯O hydrogen bonds, forming rings of S(7) graph-set motif. In the crystal, molecules are linked by intermolecular O—H⋯O and C—H⋯O interactions, forming sheets parallel to (001). All atoms. excepting the axially-oriented hydroxyl group in the major component and the equatorially-oriented fluorine atom in the minor component, are overlapping.
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Yousuf S, Kamdem RST, Ngadjui BT, Wafo P, Fun HK. 3α-Hy-droxy-tirucalla-8,24-dien-21-oic acid. Acta Crystallogr Sect E Struct Rep Online 2011; 67:o937-8. [PMID: 21754206 PMCID: PMC3099970 DOI: 10.1107/s1600536811008956] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2011] [Accepted: 03/09/2011] [Indexed: 12/02/2022]
Abstract
The title compound, C30H48O3, a triterpene isolated from the resin of canarium schweinfurthiiand, is an isomer of the previously reported triterpene 3α-hydroxytirucalla-7,24-dien-21-oic acid [Mora et al. (2001 ▶). Acta Cryst. C57, 638–640], which crystallizes in the same trigonal space group. The title molecule consists of four fused rings having chair, half-chair, half-chair and envelope conformations for rings A, B, C and D, respectively (steroid labelling). An intramolecular C—H⋯O hydrogen bond generates an S(7) ring. In the crystal, molecules are linked by O—H⋯O and C—H⋯O interactions, forming (001) sheets.
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Poumale HMP, Djoumessi AVBS, Ngameni B, Sandjo LP, Ngadjui BT, Shiono Y. A New Ceramide Isolated from Ficus lutea Vahl (Moraceae). Acta Chim Slov 2011; 58:81-86. [PMID: 24061947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023] Open
Abstract
In addition to benjaminamide (2), β-amyrin, β-amyrin acetate, lupeol, betulinic acid, β-sitosterol glucoside, a new ceramide glycoside was isolated from the woods of Ficus lutea Vahl (Moraceae). Using mass fragmentation pattern, 1 and 2D NMR spectra and by comparison with published data, the new compound was characterized as 1-O-β-D-glucopyranosyl-(2S,3R,5E,12E)-2N-[(2'R)-hydroxyhexadecanoyl]-octadecasphinga-5,12-dienine (1a) for which the trivial name lutaoside was proposed. Some isolated compounds were evaluated for their antimicrobial activities. Compounds 1a and 2 showed some antimicrobial activity.
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Poumale PHM, Krebs HC, Amadou D, Shiono Y, Guedem AN, Komguem J, Ngadjui BT, Randrianasolo R. Flavonol Glycoside from Psorospermum androsaemifolium. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201190065] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Sandjo LP, Tchoukoua A, Ntede HN, Yemloul M, Perspicace E, Keumedjio F, Couty F, Kirsch G, Ngadjui BT. New Nortriterpenoid and Ceramides From Stems and Leaves of Cultivated Triumfetta cordifolia A Rich (Tiliaceae). J AM OIL CHEM SOC 2010. [DOI: 10.1007/s11746-010-1584-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kuete V, Fozing DC, Kapche WFGD, Mbaveng AT, Kuiate JR, Ngadjui BT, Abegaz BM. Antimicrobial activity of the methanolic extract and compounds from Morus mesozygia stem bark. J Ethnopharmacol 2009; 124:551-555. [PMID: 19450674 DOI: 10.1016/j.jep.2009.05.004] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Revised: 03/03/2009] [Accepted: 05/07/2009] [Indexed: 05/27/2023]
Abstract
AIM OF THE STUDY This study was aimed at investigating the antimicrobial activity of the methanolic extract (MMB) and compounds isolated from the stem bark of Morus mesozygia, namely 3beta-acetoxyurs-12-en-11-one (1), moracin Q (2), moracin T (3), artocarpesin (4), cycloartocarpesin (5), moracin R (6), moracin U (8), moracin C (9), and moracin M (10). MATERIALS AND METHODS The liquid microdilution assay was used in the determination of the minimal inhibitory concentration (MIC) and the minimal microbicidal concentration (MMC), against nine bacterial and two fungal species. RESULTS The results of the MIC determination showed that the compounds 3, 4, 8 and 9 were able to prevent the growth of all tested microbial species. All other samples showed selective activities. Their inhibitory effects were noted on 90.9% studied organisms for the crude extract, 81.8% for compound 6, 72.7% for compound 10, 63.6% for compound 1, 54.5% for compound 5, and 45.5% for compound 2. The lowest MIC value of 39 microg/ml was obtained with the crude extract against Escherichia coli. The corresponding value for compounds (5 microg/ml) was registered with compound 9 on Shigella dysenteriae and compound 3 on E. coli, S. dysenteriae, Pseudomonas aeruginosa, Salmonella typhi and Bacillus cereus. The lowest MIC value (39 microg/ml) observed with the crude extract (on E. coli) was only eightfold greater than that of gentamycin used as reference antibiotic (RA) while the corresponding value (5 microg/ml) recorded with compounds 3 and 9 was equal to that of RA on the corresponding microorganisms. CONCLUSIONS The obtained results highlighted the interesting antimicrobial potency of M. mesozygia as well as that of the studied compounds, and provided scientific basis for the traditional use of this species.
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Affiliation(s)
- V Kuete
- Department of Biochemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon.
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Kuete V, Nana F, Ngameni B, Mbaveng AT, Keumedjio F, Ngadjui BT. Antimicrobial activity of the crude extract, fractions and compounds from stem bark of Ficus ovata (Moraceae). J Ethnopharmacol 2009; 124:556-61. [PMID: 19450673 DOI: 10.1016/j.jep.2009.05.003] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Revised: 03/03/2009] [Accepted: 05/07/2009] [Indexed: 05/16/2023]
Abstract
AIM OF THE STUDY This study was designed to investigate the antimicrobial activities of the methanol extracts from the stem bark of Ficus ovata (FOB), fractions (FOB1-6) and compounds isolated following bio-guided fractionation [3-friedelanone (1), taraxeryl acetate (2), betulinic acid (3), oleanoïc acid (4), 2-hydroxyisoprunetin (5), 6,7-(2-isopropenyl furo)-5,2,4-trihydroxyisoflavone (6), Cajanin (7) and protocatechuic acid (8)]. MATERIALS AND METHODS The micro-dilution method was used for the determination of the minimal inhibition concentration (MIC) and the minimal microbicidal concentration (MMC) against fungi (two species), gram-positive (three species) and gram-negative bacteria (five species). RESULTS The results of the MIC determinations indicated that the crude extract (FOB), fractions FOB2 and FOB4 as well as compound 5 were active on the entire studied organisms. Other samples showed selective activity, fractions FOB1, FOB3 and FOB5 being active against 50% of the tested microbial species while FOB6 was active on 40%. Compounds 8, 6, 2 and 7 prevented the growth of 80%, 70%, 50% and 20% of the organisms respectively. The lowest MIC value (156 g/ml) observed with the crude extract was recorded on Streptococcus faecalis, Candida albicans and Microsporum audouinii. The corresponding value for fractions (39 microg/ml) was noted with FOB4 against Staphylococcus aureus, while that of the tested compounds (10 microg/ml) was observed with compound 8 on Microsporum audouinii. The results of the MMC determination suggested that the cidal effect of most of the tested samples on the studied microorganisms could be expected. CONCLUSIONS The overall results provided evidence that the studied plant extract, as well as some of the isolated compounds might be potential sources of new antimicrobial drug.
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Affiliation(s)
- Victor Kuete
- Department of Biochemistry, Faculty of Science, University of Dschang, B.P. 67 Dschang, Cameroon.
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Tabopda TK, Ngoupayo J, Liu JW, Mitaine-Offer AC, Ngadjui BT, Lacaille-Dubois MA, Luu B. Induction of Neuronal Differentiation in Neurosphere Stem Cells by Ellagic Acid Derivatives. Nat Prod Commun 2009. [DOI: 10.1177/1934578x0900400415] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A bioassay-guided fractionation of methanol extracts of stem barks, combined with screening based on Epidermal Growth Factor (EGF)-responsive neural stem cells (erNSCs) differentiation assay, has been used. This study resulted in the isolation of 3,3′-di- O-methylellagic acid 1, 3,3′-di- O-methyl ellagic acid-4- O-β-D-xylopyranoside 2, ellagic acid 3, and arjunolic acid 4. Among them, compounds 1 and 2 exhibit potent induction of neuronal differentiation in neurosphere stem cells with no cytotoxic effect. These results indicate that compounds 1 and 2 may be useful as pharmacological agents for the treatment of neurodegenerative diseases. These compounds may account, for the use of T. superba in folk medicine for nervous system and mental disorders.
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Affiliation(s)
| | - Joseph Ngoupayo
- Département de Chimie Organique, Université de Yaoundé I, BP 812 Yaoundé, Cameroun
| | - Jia Wei Liu
- Laboratoire de Chimie Organique des Substances Naturelles, LC3-UMR 7177 CNRS-Université Louis Pasteur, Centre de Neurochimie, 5 Rue Blaise Pascal 67084 Strasbourg, France
| | - Anne-Claire Mitaine-Offer
- Université de Bourgogne, Faculté de Pharmacie, Laboratoire de Pharmacognosie, UMIB UPRES EA 3660, 7, Bd Jeanne d'Arc – B.P. 87900, 21079 Dijon cedex, France
| | | | - Marie-Aleth Lacaille-Dubois
- Université de Bourgogne, Faculté de Pharmacie, Laboratoire de Pharmacognosie, UMIB UPRES EA 3660, 7, Bd Jeanne d'Arc – B.P. 87900, 21079 Dijon cedex, France
| | - Bang Luu
- Laboratoire de Chimie Organique des Substances Naturelles, LC3-UMR 7177 CNRS-Université Louis Pasteur, Centre de Neurochimie, 5 Rue Blaise Pascal 67084 Strasbourg, France
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Tabopda TK, Ngoupayo J, Khan Tanoli SA, Mitaine-Offer AC, Ngadjui BT, Ali MS, Luu B, Lacaille-Dubois MA. Antimicrobial pentacyclic triterpenoids from Terminalia superba. Planta Med 2009; 75:522-527. [PMID: 19214947 DOI: 10.1055/s-0029-1185328] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Antibacterial bioassay-guided fractionation of the methanol extract of the stem bark of Terminalia superba led to the isolation of four new triterpene glucosides (1-4) which were characterized as 2 alpha,3 beta-dihydroxyolean-12-en-28-oic acid 28-O-beta-D-glucopyranoside (1), 2 alpha,3 beta, 21 beta-trihydroxyolean-12-en-28-oic acid 28-O-beta-D-glucopyranoside (2), 2 alpha,3 beta, 29-trihydroxyolean-12-en-28-oic acid 28-O-beta-D-glucopyranoside (3) and 2 alpha,3 beta,23,27-tetrahydroxyolean-12-en-28-oic acid 28-O-beta-D-glucopyranoside (4) together with the known triterpene 2 alpha,3 beta,23-trihydroxyolean-12-en-28-oic acid (5). Structures were established by spectroscopic methods including one- and two-dimensional NMR, EI-MS and HR-EI-MS. The antibacterial activity of 1-5 was also investigated against two gram-positive (Bacillus subtilis, Staphylococcus aureus), and four gram-negative (Escherichia coli, Shigella flexenari, Pseudomonas aeruginosa, Salmonella typhi) bacterial strains.
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Tabopda TK, Ngoupayo J, Liu JW, Mitaine-Offer AC, Ngadjui BT, Lacaille-Dubois MA, Luu B. Induction of neuronal differentiation in neurosphere stem cells by ellagic acid derivatives. Nat Prod Commun 2009; 4:517-520. [PMID: 19475997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023] Open
Abstract
A bioassay-guided fractionation of methanol extracts of stem barks, combined with screening based on Epidermal Growth Factor (EGF)-responsive neural stem cells (erNSCs) differentiation assay, has been used. This study resulted in the isolation of 3,3'-di-O-methylellagic acid 1, 3,3'-di-O-methyl ellagic acid-4-O-beta-D-xylopyranoside 2, ellagic acid 3, and arjunolic acid 4. Among them, compounds 1 and 2 exhibit potent induction of neuronal differentiation in neurosphere stem cells with no cytotoxic effect. These results indicate that compounds 1 and 2 may be useful as pharmacological agents for the treatment of neurodegenerative diseases. These compounds may account, for the use of T. superba in folk medicine for nervous system and mental disorders.
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