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Ethnobotanical survey, phytoconstituents and antibacterial investigation of Rapanea melanophloeos (L.) Mez. bark, fruit and leaf extracts

  • Thabile Lukhele , Denise Olivier , Marthe C. D. Fotsing , Charlotte M. Tata , Monisola I. Ikhile , Rui W. M. Krause , Sandy Van Vuuren and Derek Tantoh Ndinteh EMAIL logo
Published/Copyright: May 20, 2021
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Physical Sciences Reviews
From the journal Physical Sciences Reviews Volume 8 Issue 8

Abstract

Rapanea melanophloeos is traditionally used in South Africa in the treatment of ailments of the skin, pulmonary and gastro intestinal tract. This study was aimed at giving an overview of these traditional uses and comparing the phytochemicals and antibacterial activities of various crude extracts of the leaves, fruits and bark in order to validate these uses. The three plant parts were extracted using petroleum ether (PE), ethyl acetate (EtOAc), methanol (MeOH) and water. Various phytochemicals were compared using TLC, while alcohol precipitable solids (APS), non-polar terpenes and amino acids were analysed by GC-MS. Antibacterial activity was determined against three Gram-positive and three Gram-negative strains by microdilution assays. Caryophyllene oxides, α-cadinol and (−)-spathulenol were identified in the PE extracts. All nine essential amino acids were present in fruit extracts in significantly higher levels than in the leaves and bark; 255.1, 23.4 and 21.3 mg/g respectively. Most of the extracts showed good antibacterial activity, especially against the Gram-positive pathogens (MIC of ≤1 mg/mL), the EtOAc extracts exhibited the best activity with the fruit having an MIC values of 0.1 ± 0.2 mg/mL against Staphylococcus epidermidis and Enterococcus faecalis, 0.05 mg/mL against Bacillus cereus. Results from this study validate the ethnomedicinal uses of R. melanophloeos extracts for ailments of bacterial etiology. The plant had a rich supply of secondary metabolites, APS and amino acids and TLC and antibacterial activities of the extracts showed slight variations in chemical composition due to geographic distribution.

Keywords: alcohol precipitable solids; amino acids; antibacterial activity; phytochemicals; Rapanea melanophloeos
Corresponding author: Derek Tantoh Ndinteh, Department of Applied Chemistry, Faculty of Science, University of Johannesburg, PO Box 17011, Doornfontein 2028, Johannesburg, South Africa, E-mail:

Funding source: University of Johannesburg

Acknowledgments

This work was funded by the University of Johannesburg through the Postgraduate Bursary Fund. The authors are grateful to the staff of the Swaziland Institute for Research in Traditional Medicine, Medicinal and Indigenous Food Plants (SIREMIP) for their assistance with plant collection.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was funded by the University of Johannesburg.

  3. Conflict of interest statement: The authors declare no conflict of interest.

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/psr-2020-0143).

Published Online: 2021-05-20

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  6. Lignin-based polymers
  7. Bio-based polyhydroxyalkanoates blends and composites
  8. Biodegradable poly(butylene adipate-co-terephthalate) (PBAT)
  9. Repurposing tires – alternate energy source?
  10. Theoretical investigation of the stability, reactivity, and the interaction of methyl-substituted peridinium-based ionic liquids
  11. Polymeric membranes for biomedical applications
  12. Design of locally sourced activated charcoal filter from maize cob for wastewater decontamination: an approach to fight waste with waste
  13. Synthesis of biologically active heterocyclic compounds from allenic and acetylenic nitriles and related compounds
  14. Magnetic measurement methods to probe nanoparticle–matrix interactions
  15. Health and exposure risk assessment of heavy metals in rainwater samples from selected locations in Rivers State, Nigeria
  16. Evaluation of raw, treated and effluent water quality from selected water treatment plants: a case study of Lagos Water Corporation
  17. A chemoinformatic analysis of atoms, scaffolds and functional groups in natural products
  18. Hemicyanine dyes
  19. Thermodynamics of the micellization of quaternary based cationic surfactants in triethanolamine-water media: a conductometry study
  20. Compounds isolated from hexane fraction of Alternanthera brasiliensis show synergistic activity against methicillin resistant Staphylococcus aureus
  21. Internal structures and mechanical properties of magnetic gels and suspensions
  22. SPIONs and magnetic hybrid materials: Synthesis, toxicology and biomedical applications
  23. Magnetic field controlled behavior of magnetic gels studied using particle-based simulations
  24. The microstructure of magnetorheological materials characterized by means of computed X-ray microtomography
  25. Core-modified porphyrins: novel building blocks in chemistry
  26. Anticancer potential of indole derivatives: an update
  27. Novel drug design and bioinformatics: an introduction
  28. Multi-objective optimization of CCUS supply chains for European countries with higher carbon dioxide emissions
  29. Exergy analysis of an atmospheric residue desulphurization hydrotreating process for a crude oil refinery
  30. Development in nanomembrane-based filtration of emerging contaminants
  31. Supply chain optimization framework for CO2 capture, utilization, and storage in Germany
  32. Naturally occurring heterocyclic anticancer compounds
  33. Part-II- in silico drug design: application and success
  34. Advances in biopolymer composites and biomaterials for the removal of emerging contaminants
  35. Nanobiocatalysts and photocatalyst in dye degradation
  36. 3D tumor model – a platform for anticancer drug development
  37. Hydrogen production via water splitting over graphitic carbon nitride (g-C3N4 )-based photocatalysis
https://doi.org/10.1515/psr-2020-0143
Keywords for this article
alcohol precipitable solids; amino acids; antibacterial activity; phytochemicals; Rapanea melanophloeos

Articles in the same Issue

  1. Frontmatter
  2. Reviews
  3. Influence of lime (CaO) on low temperature leaching of some types of bauxite from Guinea
  4. Ethnobotanical survey, phytoconstituents and antibacterial investigation of Rapanea melanophloeos (L.) Mez. bark, fruit and leaf extracts
  5. Catalytic properties of supramolecular polymetallated porphyrins
  6. Lignin-based polymers
  7. Bio-based polyhydroxyalkanoates blends and composites
  8. Biodegradable poly(butylene adipate-co-terephthalate) (PBAT)
  9. Repurposing tires – alternate energy source?
  10. Theoretical investigation of the stability, reactivity, and the interaction of methyl-substituted peridinium-based ionic liquids
  11. Polymeric membranes for biomedical applications
  12. Design of locally sourced activated charcoal filter from maize cob for wastewater decontamination: an approach to fight waste with waste
  13. Synthesis of biologically active heterocyclic compounds from allenic and acetylenic nitriles and related compounds
  14. Magnetic measurement methods to probe nanoparticle–matrix interactions
  15. Health and exposure risk assessment of heavy metals in rainwater samples from selected locations in Rivers State, Nigeria
  16. Evaluation of raw, treated and effluent water quality from selected water treatment plants: a case study of Lagos Water Corporation
  17. A chemoinformatic analysis of atoms, scaffolds and functional groups in natural products
  18. Hemicyanine dyes
  19. Thermodynamics of the micellization of quaternary based cationic surfactants in triethanolamine-water media: a conductometry study
  20. Compounds isolated from hexane fraction of Alternanthera brasiliensis show synergistic activity against methicillin resistant Staphylococcus aureus
  21. Internal structures and mechanical properties of magnetic gels and suspensions
  22. SPIONs and magnetic hybrid materials: Synthesis, toxicology and biomedical applications
  23. Magnetic field controlled behavior of magnetic gels studied using particle-based simulations
  24. The microstructure of magnetorheological materials characterized by means of computed X-ray microtomography
  25. Core-modified porphyrins: novel building blocks in chemistry
  26. Anticancer potential of indole derivatives: an update
  27. Novel drug design and bioinformatics: an introduction
  28. Multi-objective optimization of CCUS supply chains for European countries with higher carbon dioxide emissions
  29. Exergy analysis of an atmospheric residue desulphurization hydrotreating process for a crude oil refinery
  30. Development in nanomembrane-based filtration of emerging contaminants
  31. Supply chain optimization framework for CO2 capture, utilization, and storage in Germany
  32. Naturally occurring heterocyclic anticancer compounds
  33. Part-II- in silico drug design: application and success
  34. Advances in biopolymer composites and biomaterials for the removal of emerging contaminants
  35. Nanobiocatalysts and photocatalyst in dye degradation
  36. 3D tumor model – a platform for anticancer drug development
  37. Hydrogen production via water splitting over graphitic carbon nitride (g-C3N4 )-based photocatalysis
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