Antibacterial potential of Manuka honey against three oral bacteria in vitro

Area of Science:

• Microbiology
• Natural Products Chemistry
• Oral Health

Background:

• Honey possesses historical use as a wound treatment and exhibits broad-spectrum antibacterial properties.
• Manuka honey from New Zealand is purported to have additional non-peroxide antimicrobial activity (NPA) against oral pathogens.
• Limited data exists on the specific antibacterial efficacy of various Manuka honey products against key oral bacteria.

Purpose of the Study:

• To evaluate the antibacterial efficacy of different Manuka honey products against specific oral pathogens.
• To compare the efficacy of Manuka honey with varying NPA values against standard antibacterial agents and control honey.
• To investigate the dose-dependent relationship between Manuka honey's NPA and its antibacterial activity.

Main Methods:

• Screening of antibacterial efficacy of Manuka honey products against *S. mutans*, *P. gingivalis*, and *A. actinomycetemcomitans*.
• Use of Chlorhexidine as a positive control, saline as a negative control, and Swiss multifloral honey as a control honey.
• Comparison of Manuka honey with different non-peroxide activity (NPA) values.

Main Results:

• Chlorhexidine exhibited the highest antibacterial potential against all tested bacteria.
• Manuka honey with NPA values below 15 showed minimal bacterial growth inhibition, comparable to or less than multifloral Swiss honey.
• Manuka honey with NPA values above 15 demonstrated significantly enhanced antibacterial effects.
• Manuka honey preparations were more effective against *P. gingivalis* and *A. actinomycetemcomitans* than *S. mutans*.

Conclusions:

• The antibacterial efficacy of Manuka honey is dependent on its non-peroxide activity (NPA) level.
• Manuka honey with higher NPA values (≥15) shows significant potential for controlling oral pathogens.
• Further research into Manuka honey as a natural antibacterial agent for oral health is warranted.