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Automated HPLC Separation Using LC-Mate: An Integrated Repetitive Autosampler and Fraction Collector for Microscale Purification
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Antibacterial acylphloroglucinols from Hypericum olympicum.

Winnie K P Shiu1, M Mukhlesur Rahman, Jonathan Curry

  • 1Department of Pharmaceutical and Biological Chemistry, The School of Pharmacy, University of London, 29-39 Brunswick Square, London WC1N 1AX, UK.

Journal of Natural Products
|September 9, 2011
PubMed
Summary

New antibacterial compounds, olympicins A-E, were isolated from Hypericum olympicum. One compound, olympicin A, shows potent activity against resistant Staph. aureus strains.

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Area of Science:

  • Natural Product Chemistry
  • Medicinal Chemistry
  • Pharmacognosy

Background:

  • Acylphloroglucinols are a class of natural products with diverse biological activities.
  • The plant Hypericum olympicum is a potential source of novel bioactive compounds.
  • Antibiotic resistance in Staph. aureus necessitates the discovery of new antibacterial agents.

Purpose of the Study:

  • To isolate and characterize new antibacterial acylphloroglucinols from Hypericum olympicum.
  • To evaluate the antibacterial activity of these compounds against resistant Staph. aureus strains.
  • To explore the synthetic accessibility of these compounds for analogue development.

Main Methods:

  • Isolation and purification of compounds using chromatographic techniques.
  • Structure elucidation using 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Antibacterial activity testing using minimum inhibitory concentration (MIC) assays against Staph. aureus strains.

Main Results:

  • Five new acylphloroglucinols, named olympicins A-E, were isolated and structurally characterized.
  • Olympicin A demonstrated significant antibacterial activity against methicillin-resistant and multidrug-resistant Staph. aureus, with MICs of 0.5-1 mg/L.
  • Olympicins B-E also exhibited antibacterial activity, with MICs ranging from 64 to 128 mg/L.
  • A straightforward four-step synthesis for olympicin A was developed, enabling the creation of structural analogs.

Conclusions:

  • Hypericum olympicum is a valuable source of novel antibacterial acylphloroglucinols.
  • Olympicin A represents a promising lead compound for the development of new anti-staphylococcal agents.
  • The established synthetic route facilitates further structure-activity relationship studies and drug discovery efforts.