Peptide spray kills bacteria in wounds without using antibiotics

It's always good if the use of antibiotics can be avoided, to kee p harmful bacteria from developing a resistance to them. A new wound-treatment spray could help, as it kills bacteria using peptides that occur naturally in our bodies – no antibiotics required.

While previous studies had explored the use of such peptides for eradicating bacteria in medical applications, a major stumbling block lay in the fact that the peptides quickly break down upon coming into contact with blood or other body fluids.

Building on the success of an earlier project, scientists at Sweden's Chalmers University of Technology developed a workaround to that problem.

In the spray that they created – which is intended to be applied directly to open wounds – the peptide molecules are attached to specially structured microparticles of hydrogel. That gel protects the peptides from the blood, while still allowing them to destroy bacteria by compromising the microbes' protective outer membranes.

As an added bonus, because the spray does kill bacteria in this particular manner, it is believed that the bacteria won't develop a resistance to it.

In lab tests, the spray was found to kill 99.99% of bacteria on contact, including antibiotic-resistant types such as MRSA (Methicillin-resistant Staphylococcus aureus). What's more, it remained effective for approximately 48 hours.

Image source: NIAID_Flickr.