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Antibacterial compounds from Planchonia careya leaf extracts.
Jacqui M McRae1, Qi Yang, Russell J Crawford
1Faculty of Life and Social Sciences, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia.
Journal of Ethnopharmacology
|February 22, 2008
Summary
Researchers identified six antibacterial compounds from Planchonia careya leaves, validating its traditional use for wound healing. Two compounds showed selective activity against vancomycin-resistant Enterococcus (VRE).
Area of Science:
- Phytochemistry
- Pharmacology
- Ethnobotany
Background:
- Planchonia careya leaves are traditionally used by Indigenous Australians for wound treatment.
- The specific compounds responsible for the medicinal properties of Planchonia careya have not been previously identified.
- Understanding the phytochemical basis of traditional remedies is crucial for scientific validation.
Purpose of the Study:
- To isolate and characterize antibacterial compounds from Planchonia careya leaf extracts.
- To assess the biological activity, including antibacterial and cytotoxic effects, of the isolated compounds.
- To provide scientific evidence supporting the traditional use of Planchonia careya for wound healing.
Main Methods:
- Activity-guided fractionation using High-Performance Liquid Chromatography (HPLC) to isolate compounds.
- Plate-hole diffusion assays to determine Minimum Inhibitory Concentrations (MICs) against bacteria.
- MTT assays using monkey kidney epithelial (MA104) cells to assess cytotoxicity.
Main Results:
- Six known compounds were successfully isolated and identified: (+)-gallocatechin, gallocatechin-(4alpha-->8)-gallocatechin, alpha-dimorphecolic acid, hyptatic acid-A, 3beta-O-cis-p-coumaroyltormentic acid, and 3beta-O-trans-p-coumaroyltormentic acid.
- Compounds 3beta-O-cis-p-coumaroyltormentic acid and 3beta-O-trans-p-coumaroyltormentic acid exhibited weak selectivity for vancomycin-resistant Enterococcus (VRE).
- These two compounds had an MIC of 59.4 µg/mL and an IC50 of 72.0 µg/mL against MA104 cells.
Conclusions:
- The isolation and identification of six antibacterial compounds from Planchonia careya leaves scientifically validate its traditional application in wound healing.
- The study highlights the potential of Planchonia careya as a source of novel antibacterial agents, particularly against resistant strains like VRE.
- Further research into these compounds could lead to the development of new topical wound treatments.
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