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Tonga SLK, Tchegnitegni BT, Siwe-Noundou X, Tsopmene UJ, Ponou BK, Dzoyem JP, Poka M, Demana PH, Tapondjou LA, Beukes DR, Antunes EM, Teponno RB. Manniosides G-J, New Ursane- and Lupane-Type Saponins from Schefflera mannii (Hook.f.) Harms. Molecules 2024; 29:3447. [PMID: 39124853 PMCID: PMC11313943 DOI: 10.3390/molecules29153447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2024] [Revised: 07/20/2024] [Accepted: 07/21/2024] [Indexed: 08/12/2024] Open
Abstract
Four previously unreported triterpenoid saponins named 3β-hydroxy-23-oxours-12-en-28-oic acid 28-O-β-D-glucopyranosyl ester (mannioside G) (1), 23-O-acetyl-3β-hydroxyurs-12-en-28-oic acid 28-O-β-D-glucopyranosyl ester (mannioside H) (2), ursolic acid 28-O-[α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosyl] ester (mannioside I) (3), and 3β-hydroxy-23-oxolup-20(29)-en-28-oic acid 28-O-β-D-glucopyranosyl ester (mannioside J) (4) were isolated as minor constituents from the EtOAc soluble fraction of the MeOH extract of the leaves of Schefflera mannii along with the known compounds 23-hydroxyursolic acid 28-O-β-D-glucopyranosyl ester (5), ursolic acid 28-O-β-D-glucopyranosyl ester (6), pulsatimmoside B (7) betulinic acid 28-O-[α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosyl] ester (8), 23-hydroxy-3-oxo-urs-12-en-28-oic acid (9), hederagenin (10), ursolic acid (11), betulinic acid (12), and lupeol (13). Their structures were elucidated by a combination of 1D and 2D NMR analysis and mass spectrometry. The MeOH extract, the EtOAc and n-BuOH fractions, and some of the isolated compounds were evaluated for their antibacterial activity against four bacteria: Staphylococcus aureus ATCC1026, Staphylococcus epidermidis ATCC 35984, Escherichia coli ATCC10536, and Klepsiella pnemoniae ATCC13882. They were also screened for their antioxidant properties, but no significant results were obtained.
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Affiliation(s)
- Simionne Lapoupée Kuitcha Tonga
- Research Unit of Environmental and Applied Chemistry, Faculty of Science, University of Dschang, Dschang P.O. Box 67, Cameroon; (S.L.K.T.); (B.T.T.); (B.K.P.); (L.A.T.)
| | - Billy Toussie Tchegnitegni
- Research Unit of Environmental and Applied Chemistry, Faculty of Science, University of Dschang, Dschang P.O. Box 67, Cameroon; (S.L.K.T.); (B.T.T.); (B.K.P.); (L.A.T.)
- School of Pharmacy, University of the Western Cape, Bellville 7535, South Africa;
- Department of Chemistry, University of the Western Cape, Bellville 7535, South Africa
| | - Xavier Siwe-Noundou
- Department of Pharmaceutical Sciences, School of Pharmacy, Sefako Makgatho Health Sciences University, P.O. Box 218, Pretoria 0208, South Africa; (M.P.); (P.H.D.)
| | - Ulrich Joël Tsopmene
- Research Unit of Microbiology and Antimicrobial Substances, Faculty of Science, University of Dschang, Dschang P.O. Box 67, Cameroon; (U.J.T.); (J.P.D.)
| | - Beaudelaire Kemvoufo Ponou
- Research Unit of Environmental and Applied Chemistry, Faculty of Science, University of Dschang, Dschang P.O. Box 67, Cameroon; (S.L.K.T.); (B.T.T.); (B.K.P.); (L.A.T.)
| | - Jean Paul Dzoyem
- Research Unit of Microbiology and Antimicrobial Substances, Faculty of Science, University of Dschang, Dschang P.O. Box 67, Cameroon; (U.J.T.); (J.P.D.)
| | - Madan Poka
- Department of Pharmaceutical Sciences, School of Pharmacy, Sefako Makgatho Health Sciences University, P.O. Box 218, Pretoria 0208, South Africa; (M.P.); (P.H.D.)
| | - Patrick H. Demana
- Department of Pharmaceutical Sciences, School of Pharmacy, Sefako Makgatho Health Sciences University, P.O. Box 218, Pretoria 0208, South Africa; (M.P.); (P.H.D.)
| | - Léon Azefack Tapondjou
- Research Unit of Environmental and Applied Chemistry, Faculty of Science, University of Dschang, Dschang P.O. Box 67, Cameroon; (S.L.K.T.); (B.T.T.); (B.K.P.); (L.A.T.)
| | - Denzil R. Beukes
- School of Pharmacy, University of the Western Cape, Bellville 7535, South Africa;
| | - Edith M. Antunes
- Department of Chemistry, University of the Western Cape, Bellville 7535, South Africa
| | - Rémy Bertrand Teponno
- Research Unit of Environmental and Applied Chemistry, Faculty of Science, University of Dschang, Dschang P.O. Box 67, Cameroon; (S.L.K.T.); (B.T.T.); (B.K.P.); (L.A.T.)
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Chedjou IN, Ngouafong FT, Tchuenguem RT, Dzoyem JP, Ponou BK, Teponno RB, Barboni L, Tapondjou LA. Siamoside A: a new C-glycosylated flavone from Senna siamea (Lam.) H. S. Irwin & Barneby (Caesalpiniaceae). Nat Prod Res 2023; 37:3461-3469. [PMID: 35687822 DOI: 10.1080/14786419.2022.2085699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 05/04/2022] [Accepted: 05/26/2022] [Indexed: 10/18/2022]
Abstract
Phytochemical investigation of the methanol extracts from the leaves and bark of Senna siamea resulted in the isolation of one new flavone C-glycoside: apigenin-8-C-[6''-(E)-feruloyl]-β-D-glucopyranoside] (1), together with sixteen known compounds including quercetin-3-O-α-L-rhamnoside (2), vitexin (3), isovitexin (4), quercetin-3-O-β-D-glucopyranoside (5), quercetin-3-O-β-D-arabinopyranoside (6), quercetin (7), kaempferol (8), methyl inositol (9), sucrose (10), betulinic acid (11), vanillic acid (12), stigmastane-3β,6α-diol (13), aurantiamide acetate (14), robinetinidol (15), catechin (16) and epicatechin (17). The structures of these compounds were established on the basis of their spectroscopic (1 D and 2 D NMR) and mass spectrometric (ESI-TOF-MS) data. The methanol extracts, fractions and some of the isolated compounds were screened for their antimicrobial properties against five microbial strains. The methanol extract and the ethyl acetate fraction from the bark showed very weak antifungal activity against C. glabrata with the same MIC value of 128 μg/mL. Compound 7 was weakly active against C. albicans with MIC of 32 μg/mL.
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Affiliation(s)
- Isaac Nde Chedjou
- Research Unit of Environmental and Applied Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Francis Tatong Ngouafong
- Research Unit of Environmental and Applied Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | | | - Jean Paul Dzoyem
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Beaudelaire Kemvoufo Ponou
- Research Unit of Environmental and Applied Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Rémy Bertrand Teponno
- Research Unit of Environmental and Applied Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Luciano Barboni
- School of Science and Technology, Chemistry Division, University of Camerino, CHIP - CHemistry Interdisciplinary Project, Camerino, Italy
| | - Léon Azefack Tapondjou
- Research Unit of Environmental and Applied Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
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