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Munvera AM, Alfred Ngenge T, Ouahouo BMW, Kucukaydin S, Nyemb JN, Fokam Mafo MA, Djappa Tchapo EC, Mkounga P, Nkengfack AE. Cholinesterase, α-glucosidase, tyrosinase and urease inhibitory activities of compounds from fruits of Rinorea oblongifolia C.H. Wright (Violaceae). Nat Prod Res 2023; 37:4169-4180. [PMID: 36757210 DOI: 10.1080/14786419.2023.2176491] [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: 10/05/2022] [Accepted: 01/24/2023] [Indexed: 02/10/2023]
Abstract
From Rinorea oblongifolia fruits, 3-Nor-4β-friedelan-24-ol (1) and 3-decyl-6,7,8-trimethoxy-2H,5H-furo[4,3,2-de]isochromene-2,5-dione (4), new derivatives alongside, 28-hydroxyfriedelan-3-one (2), friedelin (3), 3,3',4,4',5'-pentamethylcoruleoellagic acid (5), hexamethylcoruleoellagic acid (6), 3',4,4',5,5'-pentamethylcoruleoellagic acid (7), and fatty compounds 8-11 were isolated and characterized using HRESIMS, EIMS, 1D and 2D NMR. In vitro enzyme inhibition of compounds 1, 2, 4, 5, 6 and 7 were evaluated on acetylcholinesterase (AChE), butyrylcholinesterase (BChE), α-glucosidase, urease and tyrosinase. Against AChE and BChE, the phenolic compounds 4, 5, 6, and 7 had good activity probably due to the phenolic nature and methoxy substituents. Compounds 4, 5, 6 and 7 exhibited good α-glucosidase inhibition especially compound 4 whose IC50 = 42.45 ± 0.46 µg/mL was close that of acarbose (IC50 = 20.52 ± 0.84 µg/mL) standard drug. Urease and tyrosinase were appreciably inhibited by the compounds. Overall results of enzyme inhibitory assays indicate Rinorea oblongifolia, fruits and its constituents as potential remedy for enzymatic disorders.
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Affiliation(s)
- Aristide Mfifen Munvera
- Department of Organic Chemistry, Faculty of Science, The University of Yaounde I, Yaounde, Cameroon
| | - Tamfu Alfred Ngenge
- Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere, Cameroon
- Department of Medical Services and Techniques, Koycegiz Vocational School of Health Services, Mugla Sitki Kocman University, Mugla, Turkey
| | | | - Selcuk Kucukaydin
- Department of Medical Services and Techniques, Koycegiz Vocational School of Health Services, Mugla Sitki Kocman University, Mugla, Turkey
| | - Jean Noel Nyemb
- Department of Refining and Petrochemistry, National Advanced School of Mines and Petroleum Industries, University of Maroua, Kaélé, Cameroon
| | - Marcelle Aude Fokam Mafo
- Institute of Medical Research and Medicinal Plants, Ministre de la Recherche Scientifique et de l'Innovation, Yaoundé, Cameroon
| | | | - Pierre Mkounga
- Department of Organic Chemistry, Faculty of Science, The University of Yaounde I, Yaounde, Cameroon
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Ikome HN, Tamfu AN, Abdou JP, Fouotsa H, Nangmo PK, Lah FCW, Tchinda AT, Ceylan O, Frederich M, Nkengfack AE. Disruption of Biofilm Formation and Quorum Sensing in Pathogenic Bacteria by Compounds from Zanthoxylum Gilletti (De Wild) P.G. Waterman. Appl Biochem Biotechnol 2023; 195:6113-6131. [PMID: 36811771 DOI: 10.1007/s12010-023-04380-6] [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] [Accepted: 02/16/2023] [Indexed: 02/24/2023]
Abstract
Microbial resistance is facilitated by biofilm formation and quorum-sensing mediated processes. In this work, the stem bark (ZM) and fruit extracts (ZMFT) of Zanthoxylum gilletii were subjected to column chromatography and afforded lupeol (1), 2,3-epoxy-6,7-methylenedioxyconiferyl alcohol (3), nitidine chloride (4), nitidine (7), sucrose (6) and sitosterol-β-D-glucopyranoside (2). The compounds were characterized using MS and NMR spectral data. The samples were evaluated for antimicrobial, antibiofilm and anti-quorum sensing activities. Highest antimicrobial activity was exhibited by compounds 3, 4 and 7 against Staphylococcus aureus (MIC 200 µg/mL), compounds 3 and 4 against Escherichia coli (MIC = 100 µg/mL) and compounds 4 and 7 against Candida albicans (MIC = 50 µg/mL). At MIC and sub-MIC concentrations, all samples inhibited biofilm formation by pathogens and violacein production in C. violaceum CV12472 except compound 6. Good disruption of QS-sensing in C. violaceum revealed by inhibition zone diameters were exhibited by compounds 3 (11.5 ± 0.5 mm), 4 (12.5 ± 1.5 mm), 5 (15.0 ± 0.8 mm), 7 (12.0 ± 1.5 mm) as well as the crude extracts from stem barks (16.5 ± 1.2 mm) and seeds (13.0 ± 1.4 mm). The profound inhibition of quorum sensing mediated processes in test pathogens by compounds 3, 4, 5 and 7 suggests the methylenedioxy- group that these compounds possess as the possible pharmacophore.
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Affiliation(s)
- Hermia Nalova Ikome
- Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
- Laboratory of Phytochemistry, Center for Studies on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies (IMPM), P.O. Box 13033, Yaounde, Cameroon
| | - Alfred Ngenge Tamfu
- School of Chemical Engineering and Mineral Industries, University of Ngaoundere, P.O. Box 454, Ngaoundere, Cameroon.
- Food Quality Control and Analysis Program, Ula Ali Kocman Vocational School, Mugla Sitki Kocman University, 48147, Mugla, Turkey.
| | - Jean Pierre Abdou
- Department of Chemistry, Faculty of Science, University of Ngaoundere, P.O. Box 454, Ngaondere, Cameroon
| | - Hugues Fouotsa
- Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
| | - Pamela Kemda Nangmo
- Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
- Laboratory of Phytochemistry, Center for Studies on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies (IMPM), P.O. Box 13033, Yaounde, Cameroon
| | - Fidèle Castro Weyepe Lah
- Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
- Laboratory of Phytochemistry, Center for Studies on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies (IMPM), P.O. Box 13033, Yaounde, Cameroon
| | - Alembert Tiabou Tchinda
- Laboratory of Phytochemistry, Center for Studies on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies (IMPM), P.O. Box 13033, Yaounde, Cameroon.
| | - Ozgur Ceylan
- Food Quality Control and Analysis Program, Ula Ali Kocman Vocational School, Mugla Sitki Kocman University, 48147, Mugla, Turkey
| | - Michel Frederich
- Laboratory of Pharmacognosy, Center for Interdisciplinary Research on Medicine, CIRM, University of Liege, 4000, Liege, Belgium
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Mbock MA, Kamkumo RG, Shukla R, Fouatio WF, Fokou PVT, Tsofack FN, Noussi CD, Fifen R, Nkengfack AE, Singh TR, Ndjakou BL, Sewald N, Boyom FF, Ngang JJE, Boyomo O, Dimo T. Curative anti-typhoid effect of Detarium microcarpum Guill. & Perr. (Leguminosae) hydroethanolic extract root bark based-on in vivo and molecular docking analyses. J Ethnopharmacol 2023; 307:116209. [PMID: 36706937 DOI: 10.1016/j.jep.2023.116209] [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] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/11/2023] [Accepted: 01/22/2023] [Indexed: 06/18/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Detarium microcarpum is used to treat typhoid fever, a major public health problem, by indigenous population in Africa. Though its preventive activities have been documented, the curative effect is still to be confirmed. AIM OF THE STUDY This study aimed at evaluating the curative effects of the hydroethanolic extract of Detarium microcarpum root bark on Salmonella typhimurium-induced typhoid in rat and exploring the in-silico inhibition of some bacterial key enzymes. STUDY DESIGN In vitro antioxydant, in vivo antisalmonella of the extract and in silico molecular docking assay on the isolated compounds were carried out to explore the anti-salmonella effects of Detarium microcarpum. MATERIAL AND METHODS The in vitro antioxidant properties of the extract were evaluated using DPPH, ABTS and FRAP tests. The anti-salmonella activity of the extract was assessed through feacal sample from Salmonella typhimurium-infected rat cultured in Salmonella-Shigella agar (SS agar) medium. The affinity of isolated compounds (Rhinocerotinoic acid and Microcarposide) from the extract were performed on four key enzymes (Adenylosuccinate lyase, Acetyl coenzyme A synthetase, Thymidine phosphorylase and LuxS-Quorum sensor) using molecular docking simulation to elucidate the molecular level inhibition mechanism. RESULTS Crude extract of D. microcarpum root bark showed variable activities on DPPH (RSa50: 6.09 ± 1.04 μg/mL), ABTS (RSa50: 24.46 ± 0.27), and FRAP (RSa50: 23.30 ± 0.23). The extract at all the doses exhibited significant healing effect of infected rats, with the complete clearance. The extract restored hematological, biochemical and histological parameters closed to the normal control. The molecular docking results indicates that rhinocerotinoic acid and microcarposide present more affinity to the LuxS-Quorum sensor and Acetyl coenzyme A synthetase protein as compared to the others. CONCLUSION These results demonstrate potent anti-typhoid activities of the hydroethanolic of Detarium microcarpum root bark extract through antioxidant properties and high inhibitory affinity of its compounds on some bacterial key enzymes that justify its use as traditional medicine to typhoid fever.
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Affiliation(s)
- Michel Arnaud Mbock
- Department of Microbiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon; Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon; Department of Biochemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon; Department of Biochemistry, Laboratory of Biochemistry, Faculty of Science, University of Douala, PO Box 24 157, Douala, Cameroon
| | - Raceline Gounoue Kamkumo
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon; Department of Biochemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon.
| | - Rohit Shukla
- Department of Biotechnology and Bioinformatics, Jaypee University of Information Technology Waknaghat, Solan, 173215, H.P., India
| | - William Feudjou Fouatio
- Department of Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Patrick Valère Tsouh Fokou
- Department of Biochemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon; Department of Biochemistry, Faculty of Science, University of Bamenda, P.O. box 39, Bamenda, Cameroon
| | - Florence Ngueguim Tsofack
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
| | - Clarice Djouwoug Noussi
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
| | - Rodrigue Fifen
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
| | - Augustin Ephrem Nkengfack
- Department of Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Tiratha Raj Singh
- Department of Biotechnology and Bioinformatics, Jaypee University of Information Technology Waknaghat, Solan, 173215, H.P., India
| | - Bruno Lenta Ndjakou
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé 1, P.O. Box 47, Yaoundé, Cameroon
| | - Norbert Sewald
- Department of Chemistry, Bielefeld University, P.O. Box 100131, 33501, Bielefeld, Germany
| | - Fabrice Fekam Boyom
- Department of Biochemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Jean Justin Essia Ngang
- Department of Microbiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
| | - Onana Boyomo
- Department of Microbiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
| | - Theophile Dimo
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon.
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Nono Nono EC, Tsopmejio JP, Momeni J, Nkouam TF, Abdou JP, Choudhary MI, Nkengfack AE. A new flavone and a newly synthesized alkaloid from Lippia rugosa A. Chev (Verbenaceae). Nat Prod Res 2022:1-9. [PMID: 35289687 DOI: 10.1080/14786419.2022.2051706] [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: 10/18/2022]
Abstract
The chemical investigation of the leaf extract of a Cameroonian medicinal plant, Lippia rugosa A Chev (Verbenaceae) led to the isolation of a new flavonoid derivative flavolippia (1), alongside eleven known compounds: 2,4-dimethylpyridin-3,5-diol (2), 5-hydroxy-6,7,4'-trimethoxylflavone (3), 5-hydroxy-3,7,4'-trimethoxyflavone (4), 7-hydroxy-5,6,4'-trimethoxyflavone (5), 3β-hydroxy-urs-12-en-3-ol (α-amyrin) (6), lupeol acetate (7), lup-20(29)-en-3β-ol (lupeol) (8), lup-20(29)-en-3β,28-diol (betulin) (9), fridelan-3-one (fridelan) (10), saccharose (11), cosanol (12). In addition, a new semi-synthetic alkaloid derivative named lippiamicin (13) was prepared from 2,4-dimethylpyridin-3,5-diol (2). Their structures were established on the basis of their spectroscopic data, as well as 1 D and 2 D NMR. Compounds 1-13 were evaluated for their antioxidant activities. The results obtained showed that compounds 2 and 12 were the most active with IC50 values of 0.145 ± 0.011 and 0.195 ± 0.017 µM/mL respectively (for DPPH•) and 0.241 ± 0.027 and 0.223 ± 0.024 µM/mL respectively (for FRAP) compared to butylated hydroxyltoluene used as positive control.
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Affiliation(s)
- Eric Carly Nono Nono
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | - Jean Paul Tsopmejio
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | - Jean Momeni
- Department of Chemistry, Faculty of Science, University of Ngaoundere, Ngaoundere, Cameroon
| | - Tsopjio Francine Nkouam
- National Advanced School of Agro-Industrial Science, University of Ngaoundere, Ngaoundere, Cameroon
| | - Jean Pierre Abdou
- Department of Chemistry, Faculty of Science, University of Ngaoundere, Ngaoundere, Cameroon
| | - Mouhamat Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Science (ICCBS), University of Karachi, Karachi, Pakistan
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Fouatio Feudjou W, Mbock AM, Tedjon Sielinou V, Fouotsa H, Njonté Wouamba SC, Kamkumo Gounoue R, Freeze M, Stammler HG, Kezeutas Bankeu JJ, Pierre M, Ndjakou Lenta B, Tiabou Tchinda A, Sewald N, Nkengfack AE. Secondary metabolites from Detarium microcarpum Guill. and Perr. (Fabaceae). Z NATURFORSCH C 2022; 77:253-261. [PMID: 35212491 DOI: 10.1515/znc-2021-0239] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 02/04/2022] [Indexed: 11/15/2022]
Abstract
The chemical investigation of the ethanol/water (7:3) extract of the roots of Detarium microcarpum (Fabaceae) led to the isolation of one new labdane diterpenoid, microcarpin (1) and one new ceramide derivative, microcarpamide (2), along with eight known secondary metabolites (3-10) including, 5-(carboxymethyl)-5,6,8a-trimethyl-3,4,4a,5,6,7,8,8a-octahydronaphthalene-1-carboxylic acid (3), microcarposide (4), rhinocerotinoic acid (5), 1,7-dihydroxy-6-methylxanthone (6), ursolic acid (7), 3β,23-dihydroxylup-20(29)-en-28-oic acid (8), alphitolic acid (9), and stigmasterol glucoside (10). The structures of these compounds were elucidated based on their spectroscopic data. Although compounds 3 and 4 are known, their crystalline structures are reported here for the first time. These compounds were evaluated in vitro for their antisalmonella activity. The results obtained showed that, microcarpamide (2), microcarposide (4), and rhinocerotinoic acid (5) were moderately active against three salmonella strains: Salmonella typhi, Salmonella enteritidis and Salmonella typhimirium, with minimum inhibition concentration values of 76.7 and 153.5 μM.
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Affiliation(s)
- William Fouatio Feudjou
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812 Yaoundé, Cameroon.,Laboratory of Phytochemistry, Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies, P.O. Box 13033, Yaoundé, Cameroon
| | - Arnaud Michel Mbock
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaoundé I, P.O. Box 812 Yaoundé, Cameroon
| | - Valerie Tedjon Sielinou
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812 Yaoundé, Cameroon
| | - Hugue Fouotsa
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812 Yaoundé, Cameroon
| | | | - Racéline Kamkumo Gounoue
- Department of Animal Biology and Physiology, Faculty of Science, University of Yaoundé I, P.O. Box 812 Yaoundé, Cameroon
| | - Marcel Freeze
- Department of Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany
| | - Hans-Georg Stammler
- Department of Inorganic and Structural Chemistry, Faculty of Chemistry, Bielefeld University, D-33501 Bielefeld, Germany
| | | | - Mkounga Pierre
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812 Yaoundé, Cameroon
| | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, P.O. Box 47 Yaoundé, Cameroon
| | - Alembert Tiabou Tchinda
- Laboratory of Phytochemistry, Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies, P.O. Box 13033, Yaoundé, Cameroon
| | - Norbert Sewald
- Department of Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany
| | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812 Yaoundé, Cameroon
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Fouotsa H, Mkounga P, Lannang AM, Vanheuverzwijn J, Zhou Z, Leblanc K, Rharrabti S, Nkengfack AE, Gallard JF, Fontaine V, Meyer F, Poupon E, Le Pogam P, Beniddir MA. Pyrrovobasine, hybrid alkylated pyrraline monoterpene indole alkaloid pseudodimer discovered using a combination of mass spectral and NMR-based machine learning annotations. Org Biomol Chem 2021; 20:98-105. [PMID: 34596204 DOI: 10.1039/d1ob01791h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A new vobasine-tryptamine-based monoterpene indole alkaloid pseudodimer was isolated from the stem bark of Voacanga africana. As a minor constituent occurring in a thoroughly investigated plant, this molecule was targeted based on a molecular networking strategy and a rational MS2-guided phytochemical investigation led to its isolation. Its structure was formally established based on HRMS, 1D/2D NMR data, and the application of the tool Small Molecule Accurate Recognition Technology (SMART 2.0). Its absolute configuration was assigned by the exciton chirality method and TD-DFT ECD calculations. Besides featuring an unprecedented intermonomeric linkage in the small group of vobasine/tryptamine hybrids, pyrrovobasine also represents the first pyrraline-containing representative in the whole monoterpene indole alkaloids group. Biosynthetic hypotheses possibly underpinning these structural oddities are proposed here.
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Affiliation(s)
- Hugues Fouotsa
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 rue J.-B. Clément, 92290 Châtenay-Malabry, France. .,Faculty of Pharmacy, Microbiology, Bioorganic and Macromolecular Chemistry Unit, Université Libre de Bruxelles, Campus de la Plaine-CP 206/04, Boulevard du Triomphe, ACC.2, Po Box 1050, Belgium.,Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Pierre Mkounga
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Alain Meli Lannang
- Department of Chemistry, Higher Teachers Training College, University of Maroua, P.O. Box 55, Maroua, Cameroon
| | - Jérôme Vanheuverzwijn
- Faculty of Pharmacy, Microbiology, Bioorganic and Macromolecular Chemistry Unit, Université Libre de Bruxelles, Campus de la Plaine-CP 206/04, Boulevard du Triomphe, ACC.2, Po Box 1050, Belgium
| | - Zhiyu Zhou
- Faculty of Pharmacy, Microbiology, Bioorganic and Macromolecular Chemistry Unit, Université Libre de Bruxelles, Campus de la Plaine-CP 206/04, Boulevard du Triomphe, ACC.2, Po Box 1050, Belgium
| | - Karine Leblanc
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 rue J.-B. Clément, 92290 Châtenay-Malabry, France.
| | - Somia Rharrabti
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 rue J.-B. Clément, 92290 Châtenay-Malabry, France.
| | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Jean-François Gallard
- Institut de Chimie des Substances Naturelles, CNRS, ICSN UPR 2301, Université Paris-Saclay, 91198 Gif-sur-Yvette, France
| | - Véronique Fontaine
- Faculty of Pharmacy, Microbiology, Bioorganic and Macromolecular Chemistry Unit, Université Libre de Bruxelles, Campus de la Plaine-CP 206/04, Boulevard du Triomphe, ACC.2, Po Box 1050, Belgium
| | - Franck Meyer
- Faculty of Pharmacy, Microbiology, Bioorganic and Macromolecular Chemistry Unit, Université Libre de Bruxelles, Campus de la Plaine-CP 206/04, Boulevard du Triomphe, ACC.2, Po Box 1050, Belgium
| | - Erwan Poupon
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 rue J.-B. Clément, 92290 Châtenay-Malabry, France.
| | - Pierre Le Pogam
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 rue J.-B. Clément, 92290 Châtenay-Malabry, France.
| | - Mehdi A Beniddir
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 rue J.-B. Clément, 92290 Châtenay-Malabry, France.
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7
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Fouotsa H, Le Pogam P, Mkounga P, Lannang AM, Bernadat G, Vanheuverzwijn J, Zhou Z, Leblanc K, Rharrabti S, Nkengfack AE, Gallard JF, Fontaine V, Meyer F, Poupon E, Beniddir MA. Voatriafricanines A and B, Trimeric Vobasine-Aspidosperma-Aspidosperma Alkaloids from Voacanga africana. J Nat Prod 2021; 84:2755-2761. [PMID: 34569237 DOI: 10.1021/acs.jnatprod.1c00812] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Voatriafricanines A and B (1 and 2), the first examples of vobasine-aspidosperma-aspidosperma monoterpene trisindole alkaloids, were isolated from the stem barks of Voacanga africana, guided by a molecular networking strategy. Their structures, including absolute configurations, were elucidated by spectroscopic methods and ECD calculations. Compounds 1 and 2 possess intramolecular hydrogen bonding, sufficiently robust to transfer homonuclear and heteronuclear magnetizations. Compound 1 exhibited potent antimycobacterial activity with no discernible cytotoxic activity.
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Affiliation(s)
- Hugues Fouotsa
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 Rue J.-B. Clément, 92290 Châtenay-Malabry, France
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
- Faculty of Pharmacy, Microbiology, Bioorganic and Macromolecular Chemistry Unit, Université Libre de Bruxelles, Campus de la Plaine-CP 206/04, Boulevard du Triomphe, ACC.2, PO Box 1050, 1050 Bruxelles, Belgium
| | - Pierre Le Pogam
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 Rue J.-B. Clément, 92290 Châtenay-Malabry, France
| | - Pierre Mkounga
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Alain Meli Lannang
- Department of Chemistry, Higher Teachers Training College, University of Maroua, P.O. Box 55, Maroua, Cameroon
| | - Guillaume Bernadat
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 Rue J.-B. Clément, 92290 Châtenay-Malabry, France
| | - Jérôme Vanheuverzwijn
- Faculty of Pharmacy, Microbiology, Bioorganic and Macromolecular Chemistry Unit, Université Libre de Bruxelles, Campus de la Plaine-CP 206/04, Boulevard du Triomphe, ACC.2, PO Box 1050, 1050 Bruxelles, Belgium
| | - Zhiyu Zhou
- Faculty of Pharmacy, Microbiology, Bioorganic and Macromolecular Chemistry Unit, Université Libre de Bruxelles, Campus de la Plaine-CP 206/04, Boulevard du Triomphe, ACC.2, PO Box 1050, 1050 Bruxelles, Belgium
| | - Karine Leblanc
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 Rue J.-B. Clément, 92290 Châtenay-Malabry, France
| | - Somia Rharrabti
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 Rue J.-B. Clément, 92290 Châtenay-Malabry, France
| | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Jean-François Gallard
- Institut de Chimie des Substances Naturelles, CNRS, ICSN UPR 2301, Université Paris-Saclay, 91198 Gif-sur-Yvette, France
| | - Véronique Fontaine
- Faculty of Pharmacy, Microbiology, Bioorganic and Macromolecular Chemistry Unit, Université Libre de Bruxelles, Campus de la Plaine-CP 206/04, Boulevard du Triomphe, ACC.2, PO Box 1050, 1050 Bruxelles, Belgium
| | - Franck Meyer
- Faculty of Pharmacy, Microbiology, Bioorganic and Macromolecular Chemistry Unit, Université Libre de Bruxelles, Campus de la Plaine-CP 206/04, Boulevard du Triomphe, ACC.2, PO Box 1050, 1050 Bruxelles, Belgium
| | - Erwan Poupon
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 Rue J.-B. Clément, 92290 Châtenay-Malabry, France
| | - Mehdi A Beniddir
- Équipe "Chimie des Substances Naturelles" Université Paris-Saclay, CNRS, BioCIS, 5 Rue J.-B. Clément, 92290 Châtenay-Malabry, France
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Tsemeugne J, Nangmo PK, Mkounga P, Tamokou JDD, Kengne IC, Edwards G, Sopbué EF, Nkengfack AE. Synthesis, characteristic fragmentation patterns, and antibacterial activity of new azo compounds from the coupling reaction of diazobenzothiazole ions and acetaminophen. HETEROCYCL COMMUN 2021. [DOI: 10.1515/hc-2020-0127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
In this study, a series of azobenzothiazole dyes 4 were synthesized via diazotization of substituted benzothiazole derivatives followed by azo coupling with acetaminophen. The chemical structures of all synthesized compounds were confirmed using analytical data and spectroscopic techniques, including UV-visible, IR, mass spectra, and 1H- and 13C-NMR. The in situ formed diazobenzothiazole ions regiospecifically react with acetaminophen derivatives in the Hollemann-guided electrophilic aromatic substitution mechanism. The regio-orientations were established, on the one hand, by a rigorous interpretation of 1H-NMR spectra and, on the other hand, by the characteristic fragmentation patterns observed on the electrospray mass spectra. In the cases of 4a and 4b, multisubstitutions occurred. The antimicrobial activity of compound 4, along with all the starting materials, was investigated on Pseudomonas aeruginosa PA01, Staphylococcus aureus 18, Escherichia coli 64R, and S. aureus ATCC 25923. The results showed that this skeletal framework exhibited marked potency as antibacterial agents. The most active antibacterial agent against both targeted organisms was compound 4a′.
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Affiliation(s)
- Joseph Tsemeugne
- Laboratory of Natural Products and Applied Organic Synthesis (LANAPOS), Department of Organic Chemistry, University of Yaounde I , P.O. Box 812 , Yaounde , Republic of Cameroon
| | - Pamela Kemda Nangmo
- Laboratory of Natural Products and Applied Organic Synthesis (LANAPOS), Department of Organic Chemistry, University of Yaounde I , P.O. Box 812 , Yaounde , Republic of Cameroon
- Institute of Medical Research and Medicinal Plants Studies (IMPM), Ministry of Scientific Research and Innovation , P.O. Box 13033 , Yaounde , Republic of Cameroon
| | - Pierre Mkounga
- Laboratory of Natural Products and Applied Organic Synthesis (LANAPOS), Department of Organic Chemistry, University of Yaounde I , P.O. Box 812 , Yaounde , Republic of Cameroon
| | - Jean De Dieu Tamokou
- Laboratory of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang , P.O. Box 067 , Dschang , Republic of Cameroon
| | - Iréne Chinda Kengne
- Laboratory of Microbiology and Antimicrobial Substances, Department of Biochemistry, Faculty of Science, University of Dschang , P.O. Box 067 , Dschang , Republic of Cameroon
| | - Giles Edwards
- Department of Physics and Astronomy, The University of Manchester , Oxford Road, Manchester, M13 9PL , Oxford , United Kingdom
| | - Emmanuel Fondjo Sopbué
- Laboratory of Applied Synthetic Organic Chemistry, Department of Chemistry, Faculty of Science, University of Dschang , P.O. Box 67 , Dschang , Republic of Cameroon
| | - Augustin Ephrem Nkengfack
- Laboratory of Natural Products and Applied Organic Synthesis (LANAPOS), Department of Organic Chemistry, University of Yaounde I , P.O. Box 812 , Yaounde , Republic of Cameroon
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9
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Pagna JIM, Mbekou IMK, Tsamo AT, Mkounga P, Frese M, Stammler HG, Fekam FB, Lenta BN, Sewald N, Nkengfack AE. Antibacterial activity of some chemical constituents from Trichilia prieuriana (Meliaceae). Zeitschrift für Naturforschung B 2021. [DOI: 10.1515/znb-2021-0057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The chemical study of hydroethanolic extracts from different parts of Trichilia prieuriana (Meliaceae) led to the isolation and identification of 22 compounds: 2β,3β,4β-trihydroxypregnan-16-one (1), prieurianin (2), flindissone (3), deoxyflindissone (4), picraquassin E (5), ursolic acid (6), 3β-acetoxy-11α-hydroxyurs-12-en (7), 3β-acetoxy-urs-12-en-11-one (8), 3β-acetoxy-β-amyrin (9), friedelin-3-ol (10), 3-oxo, friedelin (11), 3-oxo, fridelin-28-ol (12), oleanolic acid (13), hederagenin (14), mixture of stigmasterol (15), β-sitosterol (16), β-sitosterol-3-O-β-glucopyranoside (17) and stigmasterol-3-O-β-glucopyranoside (18), erythrodiol (19), scopoletin (20), 4-hydroxy-3,5-dimethoxybenzoic acid (21) and shikimic acid (22). The absolute configurations and crystal structures of compounds 1 and 2 are reported herein for the first time. Crude extracts, fractions and isolated compounds were evaluated for their antibacterial activities against nine bacterial strains. Crude extracts from the root wood of T. prieuriana exhibited good antibacterial potency with minimal inhibitory concentration (MIC) values ranging from 31.25 to 500 µg mL−1 on the test bacteria. The ethyl acetate fraction from root wood and n-hexane-ethyl acetate (3:1) fraction from leaves showed a moderate antibacterial activity with MIC value of 250 μg mL−1 on all test bacteria. Isolated compounds exhibited significant antibacterial activity with MIC values ranging from 4.09 to 71.8 µm. Compounds 3, 6 and 7 were the most active with a broad spectrum of activities.
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Affiliation(s)
- Julio Issah Mawouma Pagna
- Department of Organic Chemistry , Faculty of Science, University of Yaoundé I , P.O. Box 812 , Yaoundé , Cameroon
| | - Ines Michèle Kanko Mbekou
- Department of Biochemistry , Faculty of Science, The University of Yaoundé I , P.O. Box 812 Yaoundé , Cameroon
| | - Armelle Tontsa Tsamo
- Department of Organic Chemistry , Faculty of Science, University of Yaoundé I , P.O. Box 812 , Yaoundé , Cameroon
| | - Pierre Mkounga
- Department of Organic Chemistry , Faculty of Science, University of Yaoundé I , P.O. Box 812 , Yaoundé , Cameroon
| | - Marcel Frese
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University , D-33501 Bielefeld , Germany
| | - Hans-Georg Stammler
- Inorganic and Structural Chemistry, Faculty of Chemistry, Bielefeld University , D-33501 Bielefeld , Germany
| | - Fabrice Boyom Fekam
- Department of Biochemistry , Faculty of Science, The University of Yaoundé I , P.O. Box 812 Yaoundé , Cameroon
| | - Bruno Ndjakou Lenta
- Department of Chemistry , Higher Teacher Training College, University of Yaoundé I , P.O. Box 47 , Yaoundé , Cameroon
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University , D-33501 Bielefeld , Germany
| | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry , Faculty of Science, University of Yaoundé I , P.O. Box 812 , Yaoundé , Cameroon
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10
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Tsamo AT, Fodja Saah EP, Langat MK, Mkounga P, Kamdem Waffo AF, Nkengfack AE. Antimycobacterial cycloartane derivatives from the roots of Trichilia welwistchii C. DC (Meliaceae). Zeitschrift für Naturforschung B 2021. [DOI: 10.1515/znb-2021-0060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Chemical investigation of the roots of Trichilia welwitschii yielded a cycloartane type terpenoid 28,29-bis-norcycloart-24-en-3β,4α,6α-triol (1), isolated as pure compound for the first time, three coumarins and three sterols. New cycloartane derivatives (1a) and (1b+1c) were obtained by hemi-synthetic reaction of compound 1. The structures of 1a–c were established by spectroscopic methods including 1D and 2D-NMR analysis, HR-EIMS, chemical transformations and by comparison of these data with those of related compounds. Evaluated for their antimycobacterial potential, compound 1 and 1b+1c were determined to show significant activities against Mycobacterium tuberculosis MIC values of 6.25 μg mL−1 while compound 1a displayed weak activity showing MIC > 100 μg mL−1. Compounds 2–4 displayed moderate activity with MIC values range from 12.5 to 50 μg mL−1.
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Affiliation(s)
- Armelle Tontsa Tsamo
- Department of Organic Chemistry , University of Yaoundé I , P. O. Box 812 , Yaoundé , Cameroon
| | - Edwige P. Fodja Saah
- Department of Organic Chemistry , Faculty of Science, University of Yaoundé I , P. O. Box 812 , Yaoundé , Cameroon
| | - Moses K. Langat
- Jodrell Laboratory , Natural Capital and Plant Health , Royal Botanic Gardens, Kew , Richmond , TW9 3DS , UK
- Department of Chemistry , Faculty of Engineering and Physical Sciences, University of Surrey , Guildford , Surrey GU2 7XH , UK
| | - Pierre Mkounga
- Department of Organic Chemistry , Faculty of Science, University of Yaoundé I , P. O. Box 812 , Yaoundé , Cameroon
| | | | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry , Faculty of Science, University of Yaoundé I , P. O. Box 812 , Yaoundé , Cameroon
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11
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Mbock MA, Fouatio WF, Kamkumo RG, Tsouh Fokou PV, Tsofack FN, Lunga PK, Essia Ngang JJ, Boyomo O, Nkengfack AE, Ndjakou BL, Sewald N, Boyom FF, Dimo T. In vitro and in vivo anti-salmonella properties of hydroethanolic extract of Detarium microcarpum Guill. & Perr. (Leguminosae) root bark and LC-MS-based phytochemical analysis. J Ethnopharmacol 2020; 260:113049. [PMID: 32534119 DOI: 10.1016/j.jep.2020.113049] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 01/29/2020] [Revised: 05/11/2020] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Typhoid fever treatment remains a challenge in endemic countries. Detarium microcarpum is traditionally used to manage typhoid. AIM OF THE STUDY The study aims to explore the efficacy of hydroethanolic extract of Detarium microcarpum root bark in rats infected with salmonella. MATERIAL AND METHODS The phytochemical profile of the extract was obtained by UHPLC-MS analysis in an attempt of standardization. The in vitro antimicrobial activity was determined using broth dilution method. Salmonella infection was induced by oral administration of S. thyphimurium to immunosuppressed rats. Infected rats were then treated 2 h later with the extract (75, 150 and 300 mg/kg), distilled water (normal and salmonella control) and ciprofloxacin (8 mg/kg) for control. Body weight was monitored and stools were cultured to determine the number of colony-forming units. At the end of treatment, animals were sacrificed, blood and organs were collected for hematological, biochemical and histopathological analyses. RESULTS Detarium microcarpum extract as well as the isolated compound (rhinocerotinoic acid) exhibited good antimicrobial activity in vitro with bacteriostatic effects. The plant extract significantly (p < 0.05) inhibited the bacterial development in infected animals with an effective dose (ED50) of 75 mg/kg. In addition, the extract prevented body weight loss, hematological, biochemical and histopathological damages in treated rats. CONCLUSION Detarium microcarpum extract possesses antisalmonella properties justifying its traditional use for the typhoid fever management.
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Affiliation(s)
- Michel Arnaud Mbock
- Department of Microbiology, Faculty of Science, University of Yaounde I, P.O. Box, 812, Yaoundé, Cameroon; Department of Animal Biology and Physiology, Faculty of Science University of Yaounde I, P.O. Box, 812, Yaoundé, Cameroon; Department of Biochemistry, Faculty of Science, University of Yaoundé I, P.O. Box, 812, Yaoundé, Cameroon
| | - William Feudjou Fouatio
- Department of Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box, 812, Yaoundé, Cameroon
| | - Raceline Gounoue Kamkumo
- Department of Animal Biology and Physiology, Faculty of Science University of Yaounde I, P.O. Box, 812, Yaoundé, Cameroon; Department of Biochemistry, Faculty of Science, University of Yaoundé I, P.O. Box, 812, Yaoundé, Cameroon
| | - Patrick Valère Tsouh Fokou
- Department of Biochemistry, Faculty of Science, University of Yaoundé I, P.O. Box, 812, Yaoundé, Cameroon; Department of Biochemistry, Faculty of Science, University of Bamenda, P.O. Box 39, Bamenda, Cameroon
| | - Florence Ngueguim Tsofack
- Department of Animal Biology and Physiology, Faculty of Science University of Yaounde I, P.O. Box, 812, Yaoundé, Cameroon
| | - Paul-Keilah Lunga
- Department of Biochemistry, Faculty of Science, University of Yaoundé I, P.O. Box, 812, Yaoundé, Cameroon
| | - Jean Justin Essia Ngang
- Department of Microbiology, Faculty of Science, University of Yaounde I, P.O. Box, 812, Yaoundé, Cameroon
| | - Onana Boyomo
- Department of Microbiology, Faculty of Science, University of Yaounde I, P.O. Box, 812, Yaoundé, Cameroon
| | - Augustin Ephrem Nkengfack
- Department of Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box, 812, Yaoundé, Cameroon
| | - Bruno Lenta Ndjakou
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé 1, P.O. Box 47, Yaoundé, Cameroon
| | - Norbert Sewald
- Department of Chemistry, Bielefeld University, P.O. Box 100131, 33501, Bielefeld, Germany
| | - Fabrice Fekam Boyom
- Department of Biochemistry, Faculty of Science, University of Yaoundé I, P.O. Box, 812, Yaoundé, Cameroon
| | - Theophile Dimo
- Department of Animal Biology and Physiology, Faculty of Science University of Yaounde I, P.O. Box, 812, Yaoundé, Cameroon.
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12
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Fouotsa H, Dzoyem JP, Lannang AM, Stammler HG, Mbazoa CD, Luhmer M, Nkengfack AE, Allémann É, Delie F, Meyer F, Sewald N. Antiproliferative activity of a new xanthone derivative from leaves of Garcinia nobilis Engl. Nat Prod Res 2020; 35:5604-5611. [PMID: 32791845 DOI: 10.1080/14786419.2020.1806270] [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: 10/23/2022]
Abstract
A new xanthone, mboudiexanthone (1), together with five known compounds, euxanthone (2), isogarcinol (3), garcinol (4), betulinic acid (5) and zeorin (6) were isolated from the leaves of Garcinia nobilis Engl. The structures were determined by 1D and 2D NMR techniques and X-ray diffraction for 6. The in vitro antiproliferative properties of isolated compounds were evaluated against the human breast cancer cell line MCF-7. All compounds showed an antiproliferative activity with an IC50 value down to ∼11 µM for isogarcinol.
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Affiliation(s)
- Hugues Fouotsa
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon.,Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
| | - Jean Paul Dzoyem
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon.,Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Geneva, Switzerland
| | - Alain Meli Lannang
- Department of Chemistry, Higher Teachers' Training College, University of Maroua, Maroua, Cameroon
| | - Hans-Georg Stammler
- Inorganic and Structural Chemistry, Department of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Celine Djama Mbazoa
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | - Michel Luhmer
- Centre d'Instrumentation en Résonance Magnétique (CIREM) Laboratoire de Résonance Magnétique Nucléaire Haute Résolution Université libre de Bruxelles (ULB), Brussels, Belgium
| | | | - Éric Allémann
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Geneva, Switzerland
| | - Florence Delie
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Geneva, Switzerland
| | - Franck Meyer
- Faculty of Pharmacy, Microbiology, Bioorganic and Macromolecular Chemistry Unit, Université Libre de Bruxelles, Brussels, Belgium
| | - Norbert Sewald
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
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13
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Tsamo AT, Pagna JIM, Nangmo PK, Mkounga P, Laatsch H, Nkengfack AE. Rubescins F–H, new vilasinin-type limonoids from the leaves of Trichilia rubescens (Meliaceae). ACTA ACUST UNITED AC 2019; 74:175-182. [DOI: 10.1515/znc-2018-0187] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 02/10/2019] [Indexed: 11/15/2022]
Abstract
Abstract
Three new limonoids, designated as rubescins F (1), G (2), and H (3), together with two known compounds of this type, TS1 (4) and trichirubine A (5), were isolated from methylene chloride/methanol extracts of Trichilia rubescens leaves. The structures of these compounds were elucidated based on 1D and 2D nuclear magnetic resonance (NMR) analysis and complemented by electrospray ionization high-resolution mass spectrometry results and by comparison to data of related compounds described in the literature and ab initio calculations. Rubescin F (1) is the first limonoid from Trichilia spp. with an oxetane ring between C-7 and C-14, which seems to be formed by the isomerization of TS1 (4). The γ-hydroxybutenolide rubescin G (2) is a potential precursor of trichirubine A (5), whereas rubescin H (3) is the first example of a triterpenoid with a single bond between C-7/C-14, forming a cyclopropane ring. The absolute configuration of these limonoids was derived from biosynthetic considerations and ab initio calculations of NMR and optical rotation dispersion data.
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Affiliation(s)
- Armelle Tontsa Tsamo
- Georg-August-University Göttingen , Institute of Organic and Biomolecular Chemistry , Tammannstraße 2 , D-37077 Göttingen , Germany
- Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , P.O. Box 812 , Yaoundé , Cameroon
- Department of Chemistry , Tshwane University of Technology , Pretoria 0001 , South Africa , Phone: 00-237 699 72 16 93
| | - Julio Issah Mawouma Pagna
- Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , P.O. Box 812 , Yaoundé , Cameroon
| | - Pamela Kemda Nangmo
- Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , P.O. Box 812 , Yaoundé , Cameroon
- Centre for Research on Medicinal Plants and Traditional Medicine , Institute of Medical Research and Medicinal Plants Studies (IMPM) , P.O. Box 13033 Yaoundé , Cameroon
| | - Pierre Mkounga
- Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , P.O. Box 812 , Yaoundé , Cameroon
| | - Hartmut Laatsch
- Georg-August-University Göttingen , Institute of Organic and Biomolecular Chemistry , Tammannstraße 2 , D-37077 Göttingen , Germany
| | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry, Faculty of Science , University of Yaoundé I , P.O. Box 812 , Yaoundé , Cameroon
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14
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Munvera AM, Ouahouo BMW, Mkounga P, Mbekou MIK, Nuzhat S, Choudhary MI, Nkengfack AE. Chemical constituents from leaves and trunk bark of Rinorea oblongifolia (Violaceae). Nat Prod Res 2019; 34:2014-2021. [PMID: 30784307 DOI: 10.1080/14786419.2019.1573230] [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: 10/27/2022]
Abstract
Two new coruleoellagic acid derivatives, 3,4',5,5',-tetramethylcoruleoellagic acid (1); 3',4,4',5,5'-pentamethylcoruleoellagic acid (2) and a new friedelane-type triterpene derivative rinol (5), were isolated from leaves and trunk bark of Rinorea oblongifolia (Violaceae) along with seven known compounds including 3,3',4,4',5'-pentamethylcoruleoellagic acid (3), hexamethylcoruleoellagic acid (4), 28-hydroxyfriedelin (6), friedelin (7), friedelan-3-ol (8), scopoletin (9) and β-sitosterol-3-O-β-D-glucopyranoside (10). Their structures were elucidated by means of spectroscopic methods including IR, 1D and 2D NMR in conjunction with mass spectrometry. Crude extracts of leaves and trunk bark as well as compounds 1-4 were evaluated for their antibacterial activities against 7 pathogenic bacterial strains (Streptococcus pneumoniae ATCC49619, Staphylococcus aureus ATCC 43300, Klepsiella pneumoniae ATCC 700603, Haemophilus influenza ATCC 49247, Escherichia coli ATCC 25922, Pseudomonas aeruginosa HM601, Staphylococcus aureus BAA 977). Compound (3) displayed noteworthy activity against Haemophilus influenza with MIC value of 9.38 µg/mL.
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Affiliation(s)
- Aristide Mfifen Munvera
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | | | - Pierre Mkounga
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
| | | | - Shehla Nuzhat
- H.E.J. Research Institute of Chemistry, International Center for Chemical and biological Science (ICCBS), University of Karachi, Karachi, Pakistan
| | - Muhammad Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Chemical and biological Science (ICCBS), University of Karachi, Karachi, Pakistan
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Kenfack Tsobnang P, Tsamo Tontsa A, Mkounga P, Ephrem Nkengfack A, Tonlé Kenfack I. Crystal structure of limonoid TS3, isolated from Trichilia rubescens. Acta Crystallogr E Crystallogr Commun 2018; 74:1083-1086. [PMID: 30116567 PMCID: PMC6073009 DOI: 10.1107/s2056989018009775] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Accepted: 07/09/2018] [Indexed: 11/10/2022]
Abstract
The title limonoid compound, C26H28O5·0.5H2O (TS3) [systematic name: (3aS,3bS,4aS,5aS,6S,7aR,8aR,8bS,11aR)-6-(furan-3-yl)-3a,5a,8b,11a-tetra-methyl-3a,4a,5,5a,6,7,7a,8b,11,11a-deca-hydro-oxireno[2',3':4b,5]oxireno[2'',3'':2',3']cyclo-penta-[1',2':7,8]phenanthro[10,1-bc]furan-3(3aH)-one hemihydrate], crystallizes with two independent mol-ecules (1 and 2) in the asymmetric unit and one water mol-ecule. TS3 is composed of three six-membered rings (A, C and D), three five-membered rings (B, E and F) and two epoxide rings. A group of five fused rings (A-E) is bonded to a furan ring (F) with a Csp3-Csp2 bond [1.500 (3) Å in mol-ecule 1 and 1.499 (3) Å in mol-ecule 2]. The absolute structures of the mol-ecules in the crystal were determined by resonant scattering; Flack parameter = 0.05 (5). In the crystal, the individual mol-ecules stack in columns along the b-axis direction. The water mol-ecule bridges mol-ecules 1 and 2 via Owater-H⋯O and C-H⋯Owater hydrogen bonds. Together with further C-H⋯O hydrogen bonds, linking mol-ecules 1 and 2, the columns are linked to form slabs parallel to the ab plane. Within each column, mol-ecules are also linked via C-H⋯π inter-actions involving the five-membered furan (F) rings.
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Affiliation(s)
| | - Armelle Tsamo Tontsa
- Department of Organic Chemistry, University of Yaounde I, PO Box 812, Yaounde, Cameroon
- Department of Chemistry, Tshwane University of Technology, Pretoria 0001, South Africa
| | - Pierre Mkounga
- Department of Organic Chemistry, University of Yaounde I, PO Box 812, Yaounde, Cameroon
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Tsamo AT, Melong R, Mkounga P, Nkengfack AE. Rubescins I and J, further limonoid derivatives from the stem bark of Trichilia rubescens (Meliaceae). Nat Prod Res 2018; 33:196-203. [DOI: 10.1080/14786419.2018.1443087] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [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)
- Armelle Tontsa Tsamo
- Faculty of Science, Department of Organic Chemistry, University of Yaounde I, Yaounde, Cameroon
- Faculty of Science, Department of Chemistry, Tshwane University of Technology, Pretoria, South Africa
| | - Raduis Melong
- Faculty of Science, Department of Organic Chemistry, University of Yaounde I, Yaounde, Cameroon
- Institute for Organic and Biomolecular Chemistry, Georg-August University, Göttingen, Germany
| | - Pierre Mkounga
- Faculty of Science, Department of Organic Chemistry, University of Yaounde I, Yaounde, Cameroon
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Mfotie Njoya E, Munvera AM, Mkounga P, Nkengfack AE, McGaw LJ. Phytochemical analysis with free radical scavenging, nitric oxide inhibition and antiproliferative activity of Sarcocephalus pobeguinii extracts. BMC Complement Altern Med 2017; 17:199. [PMID: 28376770 PMCID: PMC5381062 DOI: 10.1186/s12906-017-1712-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Accepted: 03/30/2017] [Indexed: 02/04/2023]
Abstract
Background Free radicals have been implicated in the pathogenesis of diverse metabolic disorders including cancer. Therefore, fighting against free radicals has become an important strategy in the prevention or treatment of such diseases, in addition to direct or indirect anticancer chemotherapy. Sarcocephalus pobeguinii has been used traditionally to treat various diseases in which excess production of free radicals is implicated, warranting investigation of its free radical scavenging, anticancer and anti-inflammatory activity. Methods In the present study, extracts from leaves, fruits, roots and bark of Sarcocephalus pobeguinii were evaluated on four human cancer cell lines (MCF-7, HeLa, Caco-2 and A549 cells) and a non-cancerous cell line for their antiproliferative potential. The cells were incubated with the plant extracts for 48 h at 37 °C in a 5% CO2 humidified environment and their cytotoxic effect was determined using the tetrazolium-based colorimetric (MTT) assay. The radical inhibition was determined using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and the 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) scavenging techniques. The nitric oxide inhibitory activity was determined using LPS-activated RAW 264.7 macrophages. The correlation between radical scavenging capacity and antiproliferative activity was also analysed. Results The extract from leaves of Sarcocephalus pobeguinii (LSP) exhibited the highest cytotoxic effect on all four of the human cancer cell lines but with some cytotoxicity to the normal Vero cells. However, the LSP extract had the best selectivity index, ranging from 3.15 to 18.28. Also, antioxidant and anti-inflammatory assays indicated that the LSP extract had the highest radical scavenging capacity of all the extracts. A positive linear correlation was found between free radical scavenging ability and antiproliferative activity against the four cancer cell lines, with the highest correlation factor (R2 = 0.9914) obtained between DPPH inhibition and antiproliferative activity against A549 cells. Conclusions The high selectivity index of the Sarcocephalus pobeguinii leaf extract indicates the potential of using this extract in cancer therapy. Furthermore, the positive correlation between free radical scavenging and antiproliferative activity suggests that the radical scavenging capacity of extracts may contribute to a prediction of their anticancer property.
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Kemegne GA, Mkounga P, Essia Ngang JJ, Sado Kamdem SL, Nkengfack AE. Antimicrobial structure activity relationship of five anthraquinones of emodine type isolated from Vismia laurentii. BMC Microbiol 2017; 17:41. [PMID: 28228111 PMCID: PMC5322612 DOI: 10.1186/s12866-017-0954-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 02/11/2017] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Antimicrobial activity of anthraquinone compounds of emodine type has been reported by many authors. These compounds are found in Vismia laurentii (Clusiaceae), a plant used in traditional pharmacopoeia for treatment of microbial infections among others affections. The continuous identification of new compounds has raised the problem of the relation between the structure and antimicrobial properties. RESULTS The yeast growth kinetics parameters were not influenced by the pH variation as it was the case for the other tested bacteria. Fungicidal activities were noted for all molecules while only few of them had bactericidal activities, mostly on Gram positive bacteria. Mathematical model establishing a quantitative relationship between physicochemical properties of molecules and their fungicidal activities were obtained for Candida albicans and showed that physicochemical properties impacting on antifungal activity were polarizability, partition coefficient, molecular weight and hydrogen bond acceptor. CONCLUSIONS This work demonstrated that the presence of a long aliphatic chain methoxy group substituted in position two of the emodine structure increased the antibacterial properties of the studied compounds. Moreover this antimicrobial property depends on the pH of the environment, and specifically on the polarizability and number of hydrogen bond acceptors of the compound.
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Affiliation(s)
- Gislaine Aurelie Kemegne
- Department of Microbiology, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Pierre Mkounga
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Jean Justin Essia Ngang
- Department of Microbiology, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Sylvain Leroy Sado Kamdem
- Department of Microbiology, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
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Lange N, Tontsa AT, Wegscheid C, Mkounga P, Nkengfack AE, Loscher C, Sass G, Tiegs G. The Limonoids TS3 and Rubescin E Induce Apoptosis in Human Hepatoma Cell Lines and Interfere with NF-κB Signaling. PLoS One 2016; 11:e0160843. [PMID: 27518192 PMCID: PMC4982607 DOI: 10.1371/journal.pone.0160843] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 07/26/2016] [Indexed: 01/16/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is extremely resistant towards pharmacological therapy. To date, the multi-kinase inhibitor Sorafenib is the only available therapeutic agent with the potential to prolong patient survival. Using the human hepatoma cell lines HepG2 and Huh7, we analyzed anti-cancer activities of 6 purified havanensin type limonoids isolated from the traditional African medicinal plant Trichilia rubescens Oliv. Our results show that two of the compounds, TR4 (TS3) and TR9 (Rubescin E) reduced hepatoma cell viability, but not primary hepatocyte viability, at TC50s of 5 to 10 μM. These were significantly lower than the TC50s for Sorafenib, the histone deacetylase inhibitor SAHA or 5-Fluoruracil. In comparison, TR3 (Rubescin D), a limonoid isolated in parallel and structurally highly similar to TR4 and TR9, did not interfere with hepatoma cell viability. Both, TR4 and TR9, but not TR3, induced apoptosis in hepatoma cells and interfered with NF-κB activation. TR4 as well as TR9 significantly supported anti-cancer activities of Sorafenib. In summary, the limonoids TR4 and TR9 exhibit anti-cancer activities and support Sorafenib effects in vitro, having the potential to support future HCC therapy.
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Affiliation(s)
- Nicole Lange
- Institute of Experimental Immunology and Hepatology, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Armelle Tsamo Tontsa
- University of Yaoundé I, Department of Organic Chemistry, P.O BOX: 812, Yaoundé, Cameroon
| | - Claudia Wegscheid
- Institute of Experimental Immunology and Hepatology, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Pierre Mkounga
- University of Yaoundé I, Department of Organic Chemistry, P.O BOX: 812, Yaoundé, Cameroon
| | | | - Christine Loscher
- Institute of Experimental Immunology and Hepatology, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Gabriele Sass
- Institute of Experimental Immunology and Hepatology, University Medical Center Hamburg Eppendorf, Hamburg, Germany
- California Institute for Medical Research, San Jose, CA, United States of America
| | - Gisa Tiegs
- Institute of Experimental Immunology and Hepatology, University Medical Center Hamburg Eppendorf, Hamburg, Germany
- * E-mail:
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Fouotsa H, Lannang AM, Dzoyem JP, Tatsimo SJN, Neumann B, Mbazoa CD, Razakarivony AA, Nkengfack AE, Eloff JN, Sewald N. Antibacterial and antioxidant xanthones and benzophenone from garcinia smeathmannii. Planta Med 2015; 81:594-599. [PMID: 25798641 DOI: 10.1055/s-0035-1545841] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A new prenylated xanthone, 1,3,5,8-tetrahydroxy-2-(3-methybut-2-enyl)-4-(3,7-dimethylocta-2,6-dienyl) xanthone (1), and a new benzophenone (2), together with four known xanthone derivatives, cheffouxanthone (3), smeathxanthone A (4), smeathxanthone B (5), ananixanthone (6), and two pentacyclic triterpenes, epi-friedelinol (7) and friedelin (8), were isolated from the stem bark of Garcinia smeathmannii. The structures of the compounds were elucidated on the basis of 1D and 2D NMR experiments, and compound 2 was further characterized and confirmed by single X-ray analysis. Compounds 1, 2, and 3 exhibited the most prominent antibacterial activity against gram-positive Enterococcus faecalis with minimal inhibitory concentration values of 8, 8, and 2 µg/mL, respectively, while compounds 1, 3, 4, and 6 showed the capacity to scavenge free radicals.
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Affiliation(s)
- Hugues Fouotsa
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
| | - Alain Meli Lannang
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
| | - Jean Paul Dzoyem
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Simplice J N Tatsimo
- Department of Chemistry, Higher Teachers' Training College, University of Maroua, Maroua, Cameroon
| | - Beate Neumann
- Department of Chemistry, Inorganic and Structural Chemistry, Bielefeld University, Bielefeld, Germany
| | - Celine Djama Mbazoa
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
| | | | | | - Jacobus N Eloff
- Phytomedicine Programme, Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa
| | - Norbert Sewald
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
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Biloa Messi B, Ho R, Meli Lannang A, Cressend D, Perron K, Nkengfack AE, Carrupt PA, Hostettmann K, Cuendet M. Isolation and biological activity of compounds from Garcinia preussii. Pharm Biol 2014; 52:706-711. [PMID: 24824323 DOI: 10.3109/13880209.2013.865241] [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] [Indexed: 06/03/2023]
Abstract
CONTEXT Plants of the genus Garcinia (Clusiaceae) are traditionally used to relieve stomachaches, toothaches, and as a chew stick. OBJECTIVE In order to determine which compounds were responsible for these activities, a phytochemical investigation of the fruits and leaves of Garcinia preussii Engl. was pursued. MATERIALS AND METHODS Plants were extracted by solvents of various polarities. Compounds isolation was then carried out using chromatography methods (medium- and high-pressure liquid chromatography, open column and thin-layer chromatography). The isolated compounds were identified and characterized by using 1D and 2D NMR spectroscopies. The antioxidant activity was evaluated using DPPH(•), ABTS(•-), ALP, and ORAC assays. The antimicrobial activity was assayed against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Enterococcus faecalis by determining the minimum inhibitory concentration (MIC) value. The cytotoxic activity of most of the isolated compounds was evaluated on a small panel of human cancer cell lines (DU145, HeLa, HT-29, and A431) using the XTT method. RESULTS The phytochemical investigation of G. preussii led to the isolation of eight known compounds, six benzophenones and two flavonoids. These compounds were tested for their biological activities. 1, 2, 3, 4, 7 and 8 demonstrated a high free radical scavenging activity with ER50 ranging from 0.1 to 0.7. The antimicrobial activity was shown only against Gram-positive bacteria for 1, 4, and 5. A moderate cytotoxic activity with IC50 ranging from 7 to 50 µM was observed, except for 6 which was not active. CONCLUSION These results appear to support some of the properties reported for Garcinia species.
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Fouotsa H, Tatsimo SJ, Neumann B, Michalek C, Mbazoa CD, Nkengfack AE, Sewald N, Lannang AM. A new xanthone derivative from twigs of Garcinia nobilis. Nat Prod Res 2014; 28:1030-6. [DOI: 10.1080/14786419.2014.903398] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Hugues Fouotsa
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany
| | - Simplice J.N. Tatsimo
- Department of Chemistry, Higher Teachers' Training College, University of Maroua, P.O. Box 55, Maroua, Cameroon
| | - Beate Neumann
- Inorganic and Structural Chemistry, Department of Chemistry, Bielefeld University, Bielefeld, Germany
| | - Carmela Michalek
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany
| | - Celine Djama Mbazoa
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Norbert Sewald
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany
| | - Alain Meli Lannang
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany
- Department of Chemistry, Higher Teachers' Training College, University of Maroua, P.O. Box 55, Maroua, Cameroon
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Akak CM, Nkengfack AE, Tu PF. Norbergenin derivatives from Diospyros crassiflora (Ebenaceae). Nat Prod Commun 2013; 8:1575-1578. [PMID: 24427945] [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: 06/03/2023] Open
Abstract
From the ethyl acetate extract of the stems of Diospyros crassiflora Hiern, three new norbergenin derivatives, 4,11-di-O-galloylnorbergenin (1), 3-O-galloylnorbergenin (2), and 4-O-(4'-hydroxy-3'-methoxybenzoyl)-norbergenin (3), were isolated along with ten known compounds (4-13). Their structures were established by mean of spectroscopic techniques namely 1- and 2-D NMR experiments, mass spectrometry and comparison with reported data. Isolates 1-9 were evaluated for their ability to protect PC12 cells against hydrogen peroxide induced injury. Compounds with a galloyl group in their structure were found to prevent toxicity induced by H2O2 in PC12 cells.
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Affiliation(s)
- Carine Mvot Akak
- Department of Chemistry, Faculty of Science, University of Douala, P.O. Box: 24157, Douala, Cameroon.
| | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry, Faculty of Science, University of Yaounde 1, P.O. Box: 812, Yaounde, Cameroon
| | - Peng-Fei Tu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University Health Science Center, Beijing 100191, PR China
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24
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Abstract
From the ethyl acetate extract of the stems of Diospyros crassiflora Hiern, three new norbergenin derivatives, 4,11-di- O-galloylnorbergenin (1), 3- O-galloylnorbergenin (2), and 4- O-(4'-hydroxy-3'-methoxybenzoyl)-norbergenin (3), were isolated along with ten known compounds (4–13). Their structures were established by mean of spectroscopic techniques namely 1- and 2-D NMR experiments, mass spectrometry and comparison with reported data. Isolates 1–9 were evaluated for their ability to protect PC12 cells against hydrogen peroxide induced injury. Compounds with a galloyl group in their structure were found to prevent toxicity induced by H2O2 in PC12 cells.
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Affiliation(s)
- Carine Mvot Akak
- Department of Chemistry, Faculty of Science, University of Douala, P.O. Box: 24157, Douala, Cameroon
| | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, P.O. Box: 812, Yaounde, Cameroon
| | - Peng-Fei Tu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University Health Science Center, Beijing 100191, P.R. China
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Azebaze AGB, Dongmo AB, Meyer M, Ouahouo BMW, Valentin A, Laure Nguemfo E, Nkengfack AE, Vierling W. Antimalarial and vasorelaxant constituents of the leaves ofAllanblackia monticola(Guttiferae). Annals of Tropical Medicine & Parasitology 2013; 101:23-30. [PMID: 17244407 DOI: 10.1179/136485907x157022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Phytochemical investigation of the leaves of Allanblackia monticola led to the isolation and characterisation of five prenylated xanthones [1,6-dihydroxy-3,7-dimethoxy-2-(3-methylbut-2-enyl)xanthone 1, alpha-mangostin 2, tovophyllin A 3, allanxanthone C 4 and 1,7-dihydroxy-3-methoxy-2-(3-methylbut-2-enyl)xanthone 5], two biflavonoid derivatives (amentoflavone 6 and podocarpusflavone A 7) and one pentacyclic triterpene (friedelan-3-one 8). The structures of these compounds were established on the basis of homo- and hetero-nuclear, one- and two-dimensional, nuclear magnetic resonance. Compounds 2-8 and a crude methanolic extract of A. monticola leaves were each tested for antimalarial activity in vitro, using the chloroquine-sensitive F32 and chloroquine-resistant FcM29 strains of Plasmodium falciparum; the median inhibitory concentrations (IC(50)) recorded varied from 0.7 to 83.5 mug/ml. The cytotoxicities of the compounds and crude extract, against cultures of human melanoma cells (A375), were then investigated, and cytotoxicity/antimalarial IC(50) ratios of 0.6-16.75 were recorded. In tests involving aortic rings from guinea pigs, a crude extract of the leaves of A. monticola was found to induce concentration-dependent vasorelaxation, causing up to 82% and 42% inhibition of noradrenaline- and KCl-induced contractions, respectively. The corresponding values for compounds 2 and 6 when tested against noradrenaline-induced contractions were approximately 18% and 35%, respectively.
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Affiliation(s)
- A G B Azebaze
- Department of Chemistry, Faculty of Science, University of Douala, P.O. Box 24157, Douala, Cameroon.
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Ouahouo BMW, Azebaze AGB, Meyer M, Bodo B, Fomum ZT, Nkengfack AE. Cytotoxic and antimicrobial coumarins fromMammea africana. Annals of Tropical Medicine & Parasitology 2013; 98:733-9. [PMID: 15509427 DOI: 10.1179/000349804x3126] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Six coumarin derivatives [three 4-phenylcoumarins (Mammea A/AA, Mammea A/BA and MAB 3), two 4-n-propylcoumarins (Mammea B/BB and Mammea B/BA) and one 4-n-pentylcoumarin (Mammea C/OB)], 1,5-dihydroxyxanthone and 1-methoxy-5-hydroxyxanthone have been isolated from the stem bark of Mammea africana Sabine collected in Cameroon. Although known, the structures of the coumarin derivatives were confirmed by spectral analysis, including two-dimensional nuclear magnetic resonance. All the coumarin compounds showed noteworthy cytotoxicity against the human 9-KB cell line. Both of the 4-n-propylcoumarins were also found to exhibit significant activity against Staphylococcus aureus.
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Affiliation(s)
- B M W Ouahouo
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P. O. Box 812, Yaoundé, Cameroon
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Tala VRS, Candida da Silva V, Rodrigues CM, Nkengfack AE, Campaner dos Santos L, Vilegas W. Characterization of proanthocyanidins from Parkia biglobosa (Jacq.) G. Don. (Fabaceae) by Flow Injection Analysis-Electrospray Ionization Ion Trap Tandem Mass Spectrometry and Liquid Chromatography/Electrospray Ionization Mass Spectrometry. Molecules 2013; 18:2803-20. [PMID: 23455671 PMCID: PMC6269974 DOI: 10.3390/molecules18032803] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Revised: 02/16/2013] [Accepted: 02/25/2013] [Indexed: 01/22/2023] Open
Abstract
The present study investigates the chemical composition of the African plant Parkia biglobosa (Fabaceae) roots and barks by Liquid Chromatography-Electrospray Ionization and Direct Injection Tandem Mass Spectrometry analysis. Mass spectral data indicated that B-type oligomers are present, namely procyanidins and prodelphinidins, with their gallate and glucuronide derivatives, some of them in different isomeric forms. The analysis evidenced the presence of up to 40 proanthocyanidins, some of which are reported for the first time. In this study, the antiradical activity of extracts of roots and barks from Parkia biglobosa was evaluated using DPPH method and they showed satisfactory activities.
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Affiliation(s)
- Viviane Raïssa Sipowo Tala
- Department of Organic Chemistry, Institute of Chemistry, UNESP—Sao Paulo State University, 14800-900, Araraquara, Sao Paulo, Brazil
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, PO Box 812, Yaounde, Cameroon
| | - Viviane Candida da Silva
- Department of Organic Chemistry, Institute of Chemistry, UNESP—Sao Paulo State University, 14800-900, Araraquara, Sao Paulo, Brazil
| | - Clenilson Martins Rodrigues
- Department of Organic Chemistry, Institute of Chemistry, UNESP—Sao Paulo State University, 14800-900, Araraquara, Sao Paulo, Brazil
- Center of Chemical and Instrumental Analysis, Embrapa Agroenergy, PqEB, W3 North, 70770-901, Brasilia, Distrito Federal, Brazil
| | - Augustin Ephrem Nkengfack
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, PO Box 812, Yaounde, Cameroon
| | - Lourdes Campaner dos Santos
- Department of Organic Chemistry, Institute of Chemistry, UNESP—Sao Paulo State University, 14800-900, Araraquara, Sao Paulo, Brazil
| | - Wagner Vilegas
- Department of Organic Chemistry, Institute of Chemistry, UNESP—Sao Paulo State University, 14800-900, Araraquara, Sao Paulo, Brazil
- Experimental Campus of Sao Vicente, UNESP—Sao Paulo State University, 11350-000, Sao Vicente, Sao Paulo, Brazil
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Tsamo Tontsa A, Mkounga P, Njayou FN, Manautou J, Kirk M, Hultin PG, Nkengfack AE. Rubescins A, B and C: New Havanensin Type Limonoids from Root Bark of Trichilia rubescens (Meliaceae). Chem Pharm Bull (Tokyo) 2013; 61:1178-83. [DOI: 10.1248/cpb.c13-00506] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
| | - Pierre Mkounga
- Department of Organic Chemistry, University of Yaounde I
| | | | - José Manautou
- Department of Pharmaceutical Sciences, University of Connecticut
| | - Marat Kirk
- Department of Chemistry, University of Manitoba
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Ndemangou B, Tedjon Sielinou V, Vardamides JC, Shaiq Ali M, Lateef M, Iqbal L, Afza N, Nkengfack AE. Urease inhibitory isoflavonoids from different parts of Calopogonium mucunoides (Fabaceae). J Enzyme Inhib Med Chem 2012; 28:1156-61. [DOI: 10.3109/14756366.2012.719025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Brigitte Ndemangou
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I,
Yaoundé, Cameroon
| | - Valerie Tedjon Sielinou
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I,
Yaoundé, Cameroon
- International Center for Chemical and Biological Sciences, University of Karachi,
Karachi, Pakistan
| | | | - Muhammad Shaiq Ali
- International Center for Chemical and Biological Sciences, University of Karachi,
Karachi, Pakistan
| | - Mehreen Lateef
- Pakistan Council of Scientific and Industrial Research Laboratories Complex,
Karachi, Pakistan
| | - Lubna Iqbal
- Pakistan Council of Scientific and Industrial Research Laboratories Complex,
Karachi, Pakistan
| | - Nigaht Afza
- Pakistan Council of Scientific and Industrial Research Laboratories Complex,
Karachi, Pakistan
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Vardamides JC, Sielinou VT, Akone SH, Nkengfack AE, Abegaz BM. Terpenoids from Turraeanthus species. Nat Prod Commun 2010. [DOI: 10.1177/1934578x1000501003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Chemical investigation of the root bark of Turraeanthus mannii and the stem of T. longipes resulted in the isolation of two new diterpenes, 13-methyl-labda-8(17)-en-15-oic acid (1) and 13-(hydroxymethyl)-14-hydroxy- ent-labda-8(17)-en-15-oic acid (2), along with two known diterpenes, 19-hydroxy- ent-labda-8(17),13-dien-15,16-olide (3) and 19-acetoxy- ent-labda-8(17),13-dien-15,16-olide (4), and the phytosterol, stigmasterol. The structure elucidation of the new compounds has been achieved using spectroscopic techniques.
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Affiliation(s)
| | - Valerie Tedjon Sielinou
- University of Yaounde I, Faculty of Science, Department of Organic Chemistry, P.O. Box 812, Yaounde-Cameroon
| | - Sergi Herve Akone
- University of Douala, Faculty of Science, Department of Chemistry, P.O. Box 24157 Douala-Cameroon
| | - Augustin Ephrem Nkengfack
- University of Yaounde I, Faculty of Science, Department of Organic Chemistry, P.O. Box 812, Yaounde-Cameroon
| | - Berhanu M. Abegaz
- University of Botswana, Department of Chemistry, Private Bag 00704, Gaborone-Botswana
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31
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Vardamides JC, Sielinou VT, Akone SH, Nkengfack AE, Abegaz BM. Terpenoids from Turraeanthus species. Nat Prod Commun 2010; 5:1535-1538. [PMID: 21121242] [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: 05/30/2023] Open
Abstract
Chemical investigation of the root bark of Turraeanthus mannii and the stem of T. longipes resulted in the isolation of two new diterpenes, 13-methyl-labda-8(17)-en-15-oic acid (1) and 13-(hydroxymethyl)-14-hydroxy-ent-labda-8(17)-en-15-oic acid (2), along with two known diterpenes, 19-hydroxy-ent-labda-8(17),13-dien-15,16-olide (3) and 19-acetoxy-ent-labda-8(17),13-dien-15,16-olide (4), and the phytosterol, stigmasterol. The structure elucidation of the new compounds has been achieved using spectroscopic techniques.
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32
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Akak CM, Djama CM, Nkengfack AE, Tu PF, Lei LD. New coumarin glycosides from the leaves of Diospyros crassiflora (Hiern). Fitoterapia 2010; 81:873-7. [PMID: 20580922 DOI: 10.1016/j.fitote.2010.05.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2010] [Revised: 05/18/2010] [Accepted: 05/19/2010] [Indexed: 10/19/2022]
Abstract
Two new 5-methylcoumarin glycosides named diosfeboside A (1) and B (2) and five known compounds namely kaempferol 3-O-α-L-rhamnopyranosyl-(1 → 2)-β-D-glucopyranoside (3), ursolic acid (4), betulinic acid (5), stigmasterol (6) and stigmasterol 3-O-β-D-glucopyranoside (7) were isolated from the leaves of Diospyros crassiflora (Hiern). Their structures were established through interpretation of 1 and 2D NMR, mass spectra analysis and comparison with reported data. In vitro cytotoxic activity of the new compounds against human carcinoma cell lines (HL-60, Bel-7402, BGC-823, and KB) was evaluated and no cytotoxicity was observed for each of them.
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Affiliation(s)
- Carine Mvot Akak
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, P.O. Box: 812, Yaounde, Cameroon.
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33
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Bankeu JJK, Mustafa SAA, Gojayev AS, Lenta BD, Tchamo Noungoué D, Ngouela SA, Asaad K, Choudhary MI, Prigge S, Guliyev AA, Nkengfack AE, Tsamo E, Shaiq Ali M. Ceramide and Cerebroside from the Stem Bark of Ficus mucuso (Moraceae). Chem Pharm Bull (Tokyo) 2010; 58:1661-5. [DOI: 10.1248/cpb.58.1661] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Jean Jules Kezetas Bankeu
- Department of Organic Chemistry, Faculty of Science, TWAS Research Unit of University of Yaounde I
- International Center for Chemical and Biological Sciences, University of Karachi
| | - Sufyan Awad Alkarim Mustafa
- Medical Biochemistry Research Unit, Medicinal and Aromatic Plants Research Institute, National Center for Research, Sudan
- International Center for Chemical and Biological Sciences, University of Karachi
| | - Anar Sahib Gojayev
- Biochemistry and Biotechnology Department, Biology Faculty, Baku State University
| | | | - Didérot Tchamo Noungoué
- Department of Organic Chemistry, Faculty of Science, TWAS Research Unit of University of Yaounde I
| | - Silvère Augustin Ngouela
- Department of Organic Chemistry, Faculty of Science, TWAS Research Unit of University of Yaounde I
| | - Khalid Asaad
- Medical Biochemistry Research Unit, Medicinal and Aromatic Plants Research Institute, National Center for Research, Sudan
| | | | - Sean Prigge
- Department of Microbiology and Molecular Immunology, The Bloomberg School of Public Health, Johns Hopkins University
| | - Akif Alekper Guliyev
- Biochemistry and Biotechnology Department, Biology Faculty, Baku State University
| | | | - Etienne Tsamo
- Department of Organic Chemistry, Faculty of Science, TWAS Research Unit of University of Yaounde I
| | - Muhammad Shaiq Ali
- International Center for Chemical and Biological Sciences, University of Karachi
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34
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Tsaffack M, Nguemeving JR, Kuete V, Ndejouong Tchize BLS, Mkounga P, Penlap Beng V, Hultin PG, Tsamo E, Nkengfack AE. Two new antimicrobial dimeric compounds: febrifuquinone, a vismione-anthraquinone coupled pigment and adamabianthrone, from two Psorospermum species. Chem Pharm Bull (Tokyo) 2009; 57:1113-8. [PMID: 19801869 DOI: 10.1248/cpb.57.1113] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Febrifuquinone (1), a new vismione-anthraquinone coupled pigment and a new bianthrone named adamabianthrone (2), were isolated respectively, from the roots of Psorospermum febrifugum and from the bark of Psorospermum adamauense along with eight known compounds including: two bianthrones [(bianthrone A(1) (3) and bianthrone A(2b)], one vismione [(vismione D (4)], one anthrone (3-geranyloxyemodin anthrone) and four anthraquinones [(1,8-dihydroxy-3-isoprenyloxy-6-methylanthraquinone, emodin (5), 3-geranyloxy-1,8-dihydroxy-6-methylanthraquinone and 2-geranyl-1,8-dihydroxy-6-methylanthraquinone]. Their structures were determined using modern spectroscopic methods including one and two dimensional-NMR techniques as well as MS. Compounds 1 and 2 showed significant antimicrobial activities against a wide range of bacteria and fungi.
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Affiliation(s)
- Maurice Tsaffack
- Department of Organic Chemistry, TWAS Research Unit, Yaounde University I, Cameroon
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35
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Azebaze AG, Menasria F, Noumi LG, Nguemfo EL, Tchamfo MF, Nkengfack AE, Kolb JP, Meyer M. Xanthones from the seeds of Allanblackia monticola and their apoptotic and antiproliferative activities. Planta Med 2009; 75:243-248. [PMID: 19053018 DOI: 10.1055/s-0028-1088375] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [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
Phytochemical investigations of the seeds of ALLANBLACKIA MONTICOLA have led to the isolation and characterization of one new xanthone derivative, named allanxanthone E ( 1), together with seven known compounds, including five xanthones, 1,7-dihydroxy-3-methoxy-2-(3-methylbut-2-enyl)xanthone ( 2), alpha-mangostin ( 3) , garciniafuran ( 4) , allanxanthone C ( 5), and 1,6-dihydroxy-2,4-diprenylxanthone ( 6), and two pentacyclic triterpenes, friedelin and lupeol. The structures of these compounds were established on the basis of one- and two-dimensional NMR homo- and heteronuclear correlation evidence. Some of these compounds were evaluated for their apoptotic and antiproliferative activities against human leukemic B lymphocytes, such as the hairy cell leukemia-derived ESKOL cell line and cells from B-CLL (B-cell chronic lymphocytic leukemia) patients.
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Affiliation(s)
- Anatole Guy Azebaze
- Department of Chemistry, Faculty of Science, University of Douala, Cameroon.
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36
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Menasria F, Azebaze AGB, Billard C, Faussat AM, Nkengfack AE, Meyer M, Kolb JP. Apoptotic effects on B-cell chronic lymphocytic leukemia (B-CLL) cells of heterocyclic compounds isolated from Guttiferaes. Leuk Res 2008; 32:1914-26. [PMID: 18656257 DOI: 10.1016/j.leukres.2008.05.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2008] [Revised: 05/03/2008] [Accepted: 05/16/2008] [Indexed: 01/06/2023]
Abstract
A series of 10 heterocyclic compounds purified from Allanblackia were tested on two B cell lines, ESKOL and EHEB, and on cells from B-CLL patients. Several molecules inhibited the proliferation of both cell lines and promoted apoptosis of B-CLL cells through different mechanisms, some of them elicited a dissipation of the mitochondrial transmembrane potential, other triggered caspase-3 activation and cleavage of the inducible nitric oxide synthase. Blood mononuclear cells and B-lymphocytes from healthy donors appeared less sensitive than B-CLL cells. These results indicate that these molecules may be of interest in the development of new therapies for B-CLL.
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Affiliation(s)
- F Menasria
- UMRS 872 INSERM/Université Pierre et Marie Curie/Université Paris Descartes, Centre de Recherche des Cordeliers, Paris, France
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37
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Kuete V, Eyong KO, Folefoc GN, Beng VP, Hussain H, Krohn K, Nkengfack AE. Antimicrobial activity of the methanolic extract and of the chemical constituents isolated from Newbouldia laevis. Pharmazie 2007; 62:552-6. [PMID: 17718200] [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] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The methanolic extract (NLB) and ten compounds isolated from the root bark of Newbouldia laevis Seem, namely chrysoeriol (1), newbouldiaquinone (2), 2-acetylfuro-1,4-naphthoquinone (3), 2-hydroxy-3-methoxy-9,10-dioxo-9,10-dihydroanthracene-1-carbaldehyde (4), lapachol (5), beta-sitosterol-3-O-beta-D-glucopyranoside (6), oleanolic acid (7), canthic acid (8) newbouldiamide (9) and 2-(4-hydroxyphenyl)-ethyltrioctanoate (10), were tested for in vitro antimicrobial activity. Twenty one microorganisms belonging to six Gram-positive and twelve Gram-negative bacterial species as well as three yeasts from Candida species were tested for their susceptibility to NLB and the pure isolated compounds based on the Agar Hole Diffusion test and the Liquid Dilution method. The Hole Diffusion assay indicated that NLB and compound 7 were active against all tested pathogens while other compounds showed selective activity with the antimicrobial spectra varying from 76% (compound 10) to 95 % (compound 6). Minimal inhibitory concentrations (MIC) also illustrated the important antimicrobial activity of NLB and of the isolated compounds. MIC values obtained varied from 9.76 to 312.50 microg/ml for NLB, and 0.038 to 9.76 microg/ml for pure compounds against most of the tested microorganisms. The antimicrobial activities of compounds 2, 4 and 9 are described here extensively for the first time. The results indicate a promising basis for the use of Newbouldia laevis and some of its active principles in the treatment of infectious diseases.
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Affiliation(s)
- V Kuete
- Department of Biochemistry, Yaounde University I, Yaounde, Cameroon.
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38
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Dongmo AB, Azebaze AGB, Nguelefack TB, Ouahouo BM, Sontia B, Meyer M, Nkengfack AE, Kamanyi A, Vierling W. Vasodilator effect of the extracts and some coumarins from the stem bark of Mammea africana (Guttiferae). J Ethnopharmacol 2007; 111:329-34. [PMID: 17204384 DOI: 10.1016/j.jep.2006.11.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2005] [Revised: 11/23/2006] [Accepted: 11/24/2006] [Indexed: 05/13/2023]
Abstract
CH(2)Cl(2) fraction obtained from the stem bark of Mammea africana inhibited noradrenaline (NA) or KCl-induced contraction in isolated guinea pig and rat aorta. The vasorelaxant potency of the CH(2)Cl(2) fraction of Mammea africana was diminished by a pre-treatment with Nitro-L-arginine methyl ester (L-NAME), an inhibitor of NO synthase, which was however not affected by indomethacin pre-treatment. These findings indicated that the vasorelaxant effect of Mammea africana may be partially endothelium dependent, mediated by nitric oxide and that vasoactive prostanoids might not be contributing to the vasorelaxation effect. Three bioactive compounds were isolated from this CH(2)Cl(2) fraction and identified as 4-n-propylcoumarins (1) (mammea B/BB), 4-phenylcoumarins (2) (mammea A/AA or mammeisin) and (B/BA) (3) and might involved in the vasorelaxant effect of the extract. The mechanisms of the vasorelaxant effect might therefore be multiple, including endothelium dependence and the mechanisms, which interfere with the liberation of Ca(2+) into the muscle cell.
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Affiliation(s)
- A B Dongmo
- Department of Animal Biology and Physiology, Faculty of Science, University of Douala, P.O. Box 24157, Douala, Cameroon.
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39
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Abstract
Three new compounds, 15-acetoxy-12-hydroxy-16-methyl-labda-8(17),13E-diene (1), ent-labda-8(17),13-dien-15,16-olid-19-oic acid methyl ester (2), and 12-hydroxy-labda-8(17),13-dien-15,16-olide (3), together with two known compounds, 19-acetoxy-ent-labda-8(17),13-dien-15,16-olide (4), and 16-acetoxy-12,15-epoxy-15beta-hydroxy-labda-8(17),13(16)-diene (5) were isolated from the stem bark of Turraeanthus mannii (Meliaceae). The structures of compounds 1 - 3 were elucidated by analysis of the spectroscopic data. The crude methanol extract and compound 5 exhibited weak antibacterial and antifungal activity.
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40
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Kuete V, Nguemeving JR, Beng VP, Azebaze AGB, Etoa FX, Meyer M, Bodo B, Nkengfack AE. Antimicrobial activity of the methanolic extracts and compounds from Vismia laurentii De Wild (Guttiferae). J Ethnopharmacol 2007; 109:372-9. [PMID: 16971076 DOI: 10.1016/j.jep.2006.07.044] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2006] [Revised: 05/20/2006] [Accepted: 07/31/2006] [Indexed: 05/11/2023]
Abstract
Methanolic extracts prepared from the leaves, twigs and the roots of Vismia laurentii De Wild as well as nine compounds isolated from these crude extracts, were tested for their antimicrobial activity against Gram-positive bacteria (six species), Gram-negative bacteria (12 species) and two Candida species using disc diffusion and well micro-dilution methods. The disc diffusion assay indicated that the crude extract was active against all the pathogens tested, whereas isolated compounds showed selective activities. The degree of sensitivity of the test organisms to purified compounds varied from 25 to 90%. Fridelin (8) was found to be the most active compound, while Bivismiaquinone (3) was the least active. The lowest minimum inhibition concentration (MIC) values as obtained by the micro-dilution assays were 19.53 and 1.22 microg/ml for the crude extracts and purified compounds, respectively. The lowest value for the purified compounds (1.22 microg/ml) was obtained with O(1)-demethyl-3',4'-deoxypsorospermin-3',4'-diol (6) on Candida gabrata and Bacillus subtilis; 1,8-dihydroxy-6-methoxy-3-methylanthraquinone (5) on Bacillus subtilis and 6-deoxyisojacareubin (7) on Bacillus stearothermophilus. These results provide promising baseline information for the potential use of these crude extracts as well as some of the isolated compounds in the treatment of bacterial and fungal infections.
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Affiliation(s)
- Victor Kuete
- Department of Biochemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812 Yaoundé, Cameroon.
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41
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Nguemeving JR, Azebaze AGB, Kuete V, Eric Carly NN, Beng VP, Meyer M, Blond A, Bodo B, Nkengfack AE. Laurentixanthones A and B, antimicrobial xanthones from Vismia laurentii. Phytochemistry 2006; 67:1341-6. [PMID: 16740282 DOI: 10.1016/j.phytochem.2006.03.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2006] [Revised: 03/18/2006] [Accepted: 03/22/2006] [Indexed: 05/09/2023]
Abstract
A phytochemical investigation of the constituents of the roots of Vismia laurentii has resulted in the isolation of two xanthone derivatives named laurentixanthone A (1) (6-hydroxy-3,3-dimethyl-11-(3-methylbut-2-enyl)pyrano[2,3-c]xanthen-7(3H)-one) and laurentixanthone B (2) (1-hydroxy-5,6,7,8-tetramethoxyxanthone), along with 11 known compounds: 1,7-dihydroxyxanthone, vismiaquinone, vismiaquinone B, bivismiaquinone, 3-geranyloxy-6-methyl-1,8-dihydroxyanthraquinone, O(1)-demethyl-3',4'-deoxypsorospermin-3',4'-diol, 6-deoxyisojacareubin, 1,8-dihydroxy-6-methoxy-3-methylanthraquinone, kaempferol, friedelin and stigmasterol. The structures of compounds were established by means of spectroscopic methods. Furthermore, the compounds were screened for antimicrobial activities in vitro.
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Affiliation(s)
- Jean Robert Nguemeving
- Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
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42
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Kamdem Waffo AF, Mulholland D, Wansi JD, Mbaze LM, Powo R, Mpondo TN, Fomum ZT, König W, Nkengfack AE. Afzeliixanthones A and B, two new prenylated xanthones from Garcinia afzelii ENGL. (Guttiferae). Chem Pharm Bull (Tokyo) 2006; 54:448-51. [PMID: 16595943 DOI: 10.1248/cpb.54.448] [Citation(s) in RCA: 14] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two new prenylated xanthones, afzeliixanthones A (1) and B (2), together with three known xanthones (3-5) and two phytosterols, beta-sitosterol and stigmasterol, were isolated from the CH2Cl2/MeOH (1:1) extract of the stem bark of Garcinia afzelii ENGL. collected in the South West Province of Cameroon. Structures were mainly established using one and two-dimensional NMR and mass spectroscopies. The antioxidant activities of the crude extracts as well as the new compounds (1) and (2) were evaluated.
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43
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Meli Lannang A, Lontsi D, Ngounou FN, Sondengam BL, Nkengfack AE, van Heerden FR, Assob JCN. Securidacaxanthone A, a heptaoxygenated xanthone from Securidaca longepedunculata. Fitoterapia 2006; 77:199-202. [PMID: 16564647 DOI: 10.1016/j.fitote.2006.01.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2003] [Accepted: 01/13/2006] [Indexed: 11/23/2022]
Abstract
From the root bark of Securidaca longepedunculata, a heptaoxygenated xanthone (1) has been isolated as well as two known xanthones (2) and (3) and two salicylic acid derivatives (4) and (5). The structure of 1 has been elucidated from 1H and 13C-NMR spectral data.
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Affiliation(s)
- A Meli Lannang
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
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44
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Azebaze AGB, Meyer M, Valentin A, Nguemfo EL, Fomum ZT, Nkengfack AE. Prenylated Xanthone Derivatives with Antiplasmodial Activity from Allanblackia monticola STANER L.C. Chem Pharm Bull (Tokyo) 2006; 54:111-3. [PMID: 16394561 DOI: 10.1248/cpb.54.111] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Further study of the methanol extract of the stem bark of Allanblackia monticola STANER L.C. resulted in the isolation of a new prenylated xanthenedione, designated allanxanthone C, together with the five known xanthones, garciniafuran, tovophyllin A, rubraxanthone, norcowanin and mangostin and one saponin, stigmasterol-3-O-beta-D-glucopyranoside. The structure of the new compound was established by detailed spectroscopic analysis to be 1,2-dihydro-3,6,8-trihydroxy-1,1,7-tri(3-methylbut-2-enyl)xanthen-2,9-dione (3-hydroxyapetalinone C). The methanol extract and pure compounds were tested on two strains of Plasmodium falciparum, F32 (chloroquine sensitive) and FcM29 (chloroquine resistant). The IC50 values obtained ranged from 0.6 to 8.9 microg/ml. Their cytotoxicity was estimated on human melanoma cells (A375) and the cytotoxicity/antiplasmodial ratio was found to be between 15.45 and 30.46. The antimicrobial activities against a range of microorganisms of the crude extract and some of these compounds are also reported.
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45
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Vardamides JC, Dongmo AB, Meyer M, Ndom JC, Azebaze AGB, Zounda MRS, Sielinou VT, Ndemangou B, Nkengfack AE, Ngando TM, Fomum ZT. Alkaloids from the Stem Bark of Turraeanthus africanus (Meliaceae). Chem Pharm Bull (Tokyo) 2006; 54:1034-6. [PMID: 16819226 DOI: 10.1248/cpb.54.1034] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Fractionation of the methanol extract of the stem bark of Turraeanthus africanus led to the isolation of two new alkaloids designated turraeanthin A and B, together with two known alkaloids. The structures of the new alkaloids were elucidated by means of spectroscopic analysis and characterized as 10-O-demethyl-17-O-methyl isoarnottianamide and 11-demethoxyl-12-methoxyl oxynitidine respectively.
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46
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Fotie J, Nkengfack AE, Rukunga G, Tolo F, Peter MG, Heydenreich M, Fomum ZT. In-vivo antimalarial activity of some oxygenated xanthones. Ann Trop Med Parasitol 2004; 97:683-8. [PMID: 14613627 DOI: 10.1179/000349803225002390] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
A series of oxygenated xanthones was prepared so that the antimalarial activity of each compound could be evaluated in vivo, using 4-day suppressive assays against Plasmodium berghei ANKA in BALB/c mice. When given in a dose of 20 mg/kg.day for 4 days, most of the compounds produced significant chemosuppression of parasitaemia. The most active compound was 1,3,6,8-tetrahydroxyxanthone, which reduced the percentage of erythrocytes infected by 70.5%, followed by norlichexanthone (44.3%) and its isomer, 1,3,8-trihydroxy-6-methylxanthone (37.0%). Whereas di-C-allyl-dihydroxyxanthone showed lower but still notable activity (33.4%), 1,3-dihydroxyxanthone was much less active (15.1%). This appears to be the first demonstration of the antimalarial activity of some hydroxyxanthones in vivo.
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Affiliation(s)
- J Fotie
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, PO Box 812, Yaounde, Cameroon.
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47
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Vardamides JC, Azebaze AGB, Nkengfack AE, Van Heerden FR, Fomum ZT, Ngando TM, Conrad J, Vogler B, Kraus W. Scaphopetalone and scaphopetalumate, a lignan and a triterpene ester from Scaphopetalum thonneri. Phytochemistry 2003; 62:647-650. [PMID: 12560041 DOI: 10.1016/s0031-9422(02)00616-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
From the methanol extract of the stem bark of Scaphopetalum thonneri, two new compounds, including one lignan, named scaphopetalone, one new ester of ferulic acid, named scaphopetalumate were isolated together with three known compounds including: two coumarins (scopoletin and scopolin), and one pentacyclic triterpene (oleanolic acid). The structure of the new compounds were elucidated by means of spectroscopic analyses.
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Affiliation(s)
- J C Vardamides
- Department of Organic Chemistry, University of Douala, PO Box 24157, Douala, Cameroon.
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48
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Abstract
Bioassay-directed fractionation of the CH(2)Cl(2)-MeOH (1:1) extract of the stem bark of Erythrina indica, has resulted in the isolation of two new isoflavone derivatives named indicanines D and E together with 11 known compounds including: six isoflavones (genistein, wighteone, alpinumisoflavone, dimethylalpinumisoflavone, 8-prenyl erythrinin C, and erysenegalensein E), one cinnamate (erythrinassinate B), two pentacyclic triterpenes (oleanolic acid and erythrodiol), and two phytosterols (stigmasterol and its 3-O-beta-D-glucopyranoside). The structures of the new compounds were elucidated by means of spectroscopic analysis. The in vitro cytocidal activity against KB cells of some of the isolated compounds is also reported.
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Affiliation(s)
- A E Nkengfack
- Department of Organic Chemistry, Faculty of Science University of Yaounde I, PO Box 812 Yaounde, Cameroon.
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49
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Abstract
Asebotin (1), a dihydrochalcone glucoside, was isolated from the stem bark of Guibourtia tessmanni and characterised by means of spectroscopic analysis including 1H-, 13C, MS and 1D Noe difference experiment.
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Affiliation(s)
- A E Nkengfack
- Department of Organic Chemistry, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon.
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50
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Abstract
One new diterpenoid, methyl 3alpha-hydroxy-7-oxo-dehydroabietate (1), two new limonoids, 3alpha-deacetyl-amoorastatin (2) and 9beta-amoorastatin (3), and the known limonoid amoorastatin (4) were isolated from the stem of Pterorhachis zenkeri.
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Affiliation(s)
- J C Vardamides
- Department of Organic Chemistry, University of Douala, P.O. Box 24157, Douala, Cameroon.
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