Special Dyes and Lighting Kill MRSA, Research Shows

But new technologies don't replace basic infection control procedures, expert says

By Steven Reinberg
HealthDay Reporter

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WEDNESDAY, Sept. 10 (HealthDay News) -- A new kind of paint that releases titanium dioxide when exposed to fluorescent light and a green dye for wounds that gives off toxic molecules when activated by near-infrared light could both kill the deadly superbug known as MRSA, two new studies claim.

MRSA stands for methicillin-resistant Staphylococcus aureus. It's a strain of staph that's resistant to many antibiotics commonly used to treat it, and it can be fatal. Both reports were presented Tuesday at the Society for General Microbiology Autumn meeting at Trinity College in Dublin.

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In the first study, British researcher Lucia Caballero, from Manchester Metropolitan University, found that paint that contained particles of titanium dioxide killed bacteria when it absorbed ultraviolet light.

"If this turns out, the impact is sure to be positive in the area of health," Caballero said.

The same reaction occurs when paints containing titanium dioxide are exposed to infrared light. The researchers found that the paint containing titanium dioxide successfully killed bacteria when the concentration of these nanoparticles was stronger than the normal paint. In fact, they found that all E. coli were killed with fluorescent lights.

"There are many circumstances where it is necessary or desirable to remove or to kill microorganisms found in a biological host or on surfaces," Caballero said. "Maintenance of hygienic standards is essential in hospitals, pharma and the food industry. Surface hygiene could be improved by the action of fluorescent light on catalytic surfaces, such as paints containing nanotitanium, for retarding contamination and saving on cost of cleaning maintenance."

In the second report, Dr. Ghada Omar, from University College London, found that 99 percent of the MRSA bacteria in infected wounds could be killed using a green dye that gives off toxic molecules when activated by infrared light.

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