Using light to kill MRSA

Scientists from

and

have unveiled a device that can kills microorganisms such as MRSA using light and nanoparticles in a new way.

In research spanning several years, the researchers developed a nanotechnology-based photosensitiser that kills many more microbes at very small unit doses.

According to Dr Cale Street, director of research at Ondine Biopharma, the new nanoparticle photosensitiser is the most potent light-activated antimicrobial agent known to date.

It works by forming a covalent bond - a shared pair of electrons between two atoms - between gold nanoclusters and an existing photosensitiser to boost the bacterial killing efficacy. This means clinicians can use very low concentrations of photosensitiser to achieve greater than 99.99 per cent eradication of bacteria in seconds to minutes.

The companies say this will improve their ability to develop photodisinfection-based products for the clinical treatment of infections in wounds, burns and other conditions.

'This development is the culmination of an intensive, cross-functional research effort to develop next-generation anti-MRSA photodisinfection agents,' said Professor Michael Wilson, division of microbial diseases, University College London. 'As resistance to antibiotics continues to increase in most of the major human pathogens, this powerful technology has great potential in the struggle against the growing prevalence of hospital-acquired infections.'