Ecological Richness in Native Australian Honey Boosts Antimicrobial Power

A five-year investigation led by the University of Sydney has confirmed that honey derived from a diverse range of Australian native flora exhibits significantly stronger antimicrobial capabilities compared to honey sourced from a single plant species. This finding establishes the nectar as a potent, naturally occurring agent in the global effort to combat infections resistant to conventional antibiotics.

The research team analyzed 56 distinct honey samples, including specimens collected from apiaries in New South Wales and Victoria that were recovering from the 2020 bushfires. This direct sampling established a correlation between the ecological variety of the foraging landscape and a measurable increase in the honey's healing efficacy. The study indicated that honey from mixed native sources, frequently incorporating nectar from Eucalyptus and Tea Tree plants, demonstrated notable effectiveness against critical pathogens such as *Staphylococcus aureus* and *Escherichia coli*. More than three-quarters of the native plant-derived samples inhibited dangerous bacteria at dilutions of 10 percent or less.

Dr. Kenya Fernandes, the lead researcher, noted that this "smorgasbord" effect, resulting from bees foraging on a wide variety of native plants, yields honey chemically dense with bioactive compounds. This chemical complexity, which includes elevated levels of phenolics and antioxidants, underpins the superior performance against monofloral varieties. The World Health Organization lists antimicrobial resistance as a top-ten global public health threat, positioning this Australian native honey as a globally competitive natural medical product that could complement synthetic drugs.

The research also carries implications for environmental and economic recovery following the 2019-2020 bushfire crisis, which severely impacted Australian native forests. Industry reports indicated that 9,809 hives were destroyed by fire and 88,094 hives lost their forager bees across New South Wales and Victoria alone. The study underscores that investment in local biodiversity restoration and the maintenance of healthy bee populations directly correlates with boosting the healing power of the resulting honey.

Separately, research on honey from Australian stingless bees (*Tetragonula carbonaria*, *Tetragonula hockingsi*, and *Austroplebeia australis*), also known as 'sugarbag' honey, has shown its antimicrobial properties are stable even after heat treatment and long-term storage, exhibiting both peroxide and non-peroxide activity. Professor Dee Carter, a co-author, observed that this consistency across diverse locations distinguishes stingless bee honey from standard honeybee honey, which can fluctuate significantly with seasonal floral changes. A commercial hurdle remains, as each stingless beehive yields only about half a litre of honey annually, presenting a challenge for large-scale medical application.