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A Spray That Stops Bacteria From Talking to Each Other Could Reduce Dependence on Antibiotics

Rotting vegetable matter waits to be recycled. The spray could be used in food packaging to stop the spread of bacteria. Mike Hutchings/Reuters

Humans are at constant war with bacteria, and the increasing prevalence of drug-resistant strains has fuelled fears that one day soon we may lose the fight completely.

Researchers from the Hebrew University of Jerusalem may help us win back the upper hand: Michael Brandwein and his mentor, Doron Steinberg, have developed a technology capable of cutting the lines of communication between bacteria – and therefore rendering them ineffective.

In nature, most bacteria are associated in biofilms, unique living environments that harbour the microorganisms and encourage them to grow – and attack other living things. Biofilms, which cling to both organic and non-organic surfaces, are better known as the slime often seen on recently fresh fruits and drainage pipes.

To stop biofilms from forming, Brandwein has created a sprayable polymer containing a small but powerful molecule named “TZD”.

When applied to food packaging, the spray prevents bacteria from communicating with each other. “They don’t know how to grow and form a biofilm. It keeps them static instead of killing,” Brandwein says. “One bacterium isn’t able to do anything; they need each other to coordinate their attack.” Without biofilms, food has a longer shelf life and is far less likely to cause illness in consumers.

Food packaging is only one of many uses developers see for this anti-biofilm polymer. “Biofilms are basically everywhere, mostly causing problems,” explains Steinberg. His team is working on a coating for urinary catheters and an oral anti-cavity, anti-plaque product. The team is also developing a way to keep biofilms from growing on the bottom of ships. Here “it is an economic problem, not a health one,” he says: biofilms can slow down the ships.

The best part is that this approach helps buck the trend of overusing antibiotics: the spray’s potency is not at the mercy of evolution. “Bacteria need to communicate in order to be effective and cause disease, no bacteria is going to want to develop a mechanism to stop them from communicating,” says Brandwein.

As for being an alternative to antibiotics, it may be too soon to speculate, but according to Brandwein, “it shows promise that this is where it’s heading”.