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Live/Dead Staining for Quantifying Viable but Not Culturable Cells in Manuka Honey-Treated Wound-Causing Bacteria
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How honey kills bacteria.

Paulus H S Kwakman1, Anje A te Velde, Leonie de Boer

  • 1Department of Medical Microbiology, Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|March 16, 2010
PubMed
Summary

Medical-grade honey exhibits potent antibacterial activity against resistant bacteria. Researchers identified hydrogen peroxide, methylglyoxal, bee defensin-1, and sugar as key bactericidal factors, fully characterizing honey

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Area of Science:

  • Microbiology
  • Biochemistry
  • Natural Products Chemistry

Background:

  • Antibiotic resistance is a growing global health threat.
  • Honey possesses known antibacterial properties, making it a potential therapeutic agent.
  • Understanding honey's antimicrobial mechanisms is crucial for its medical application.

Purpose of the Study:

  • To comprehensively identify and characterize all bactericidal factors in medical-grade honey.
  • To elucidate the specific contributions of each identified factor to honey's overall antimicrobial activity.
  • To validate the findings against a range of clinically relevant, antibiotic-resistant bacterial strains.

Main Methods:

  • A novel successive neutralization approach was employed to isolate individual bactericidal components.
  • Quantification of hydrogen peroxide (H(2)O(2)) and methylglyoxal (MGO) levels.
  • Activity-guided isolation using Bacillus subtilis to identify additional antimicrobial factors, leading to the discovery of bee defensin-1.
  • Comparative analysis of honey's activity against a sugar solution and neutralized honey variants.

Main Results:

  • Medical-grade honey demonstrated significant bactericidal activity at 10-20% concentrations, outperforming a sugar solution.
  • Key identified bactericidal factors include hydrogen peroxide (H(2)O(2)), methylglyoxal (MGO), and bee defensin-1.
  • After neutralizing H(2)O(2), MGO, and bee defensin-1, residual activity was primarily attributed to pH and sugar content.
  • The combined effect of sugar, H(2)O(2), MGO, and bee defensin-1 accounted for the total antibacterial activity against tested pathogens.

Conclusions:

  • The antibacterial activity of medical-grade honey is a multifactorial phenomenon.
  • Hydrogen peroxide, methylglyoxal, and bee defensin-1 are essential contributors to honey's potent antimicrobial effects.
  • pH plays a significant role in modulating honey's antibacterial capacity.
  • This study provides a complete characterization of the antibacterial factors in medical-grade honey, supporting its therapeutic potential.