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New antimicrobial cycloartane triterpenes from Acalypha communis
Maria-Teresa Gutierrez-Lugo1, Maya P Singh, William M Maiese
1Department of Pharmacology and Toxicology, Division of Medicinal and Natural Products Chemistry, College of Pharmacy, University of Arizona, 1703 E. Mabel Street, Tucson, Arizona 85721-0207, USA.
Journal of Natural Products
|June 29, 2002
Summary
Three new triterpenes from Acalypha communis show antimicrobial activity against resistant bacteria like vancomycin-resistant enterococci and methicillin-resistant staphylococci.
Area of Science:
- Natural Product Chemistry
- Pharmacology
Background:
- Acalypha communis is a plant source of bioactive compounds.
- Cycloartane-type triterpenes are a class of natural products with diverse biological activities.
Purpose of the Study:
- To isolate and characterize new cycloartane-type triterpenes from Acalypha communis.
- To evaluate the antimicrobial activity of these novel compounds against various bacteria.
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation via spectroscopic methods (NMR, MS) and chemical derivatization.
- Antimicrobial activity testing using broth microdilution assays (MIC determination).
Main Results:
- Three new cycloartane-type triterpenes, 16 alpha-hydroxymollic (1), 15 alpha-hydroxymollic (2), and 7 beta,16 beta-dihydroxy-1,23-dideoxyjessic acids (3), were identified.
- Compounds 1-3 demonstrated moderate activity against vancomycin-resistant enterococci (MICs 8-32 microg/mL).
- Compound 1 showed activity against methicillin-resistant staphylococci; activity against Gram-negative bacteria was poor.
Conclusions:
- Novel cycloartane-type triterpenes from Acalypha communis possess antimicrobial properties, particularly against Gram-positive resistant strains.
- Further investigation into these compounds may lead to new therapeutic agents for combating resistant bacterial infections.