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Test strip colors indicate nerve gas threat

U. MICHIGAN (US) — A new litmus-like test can protect soldiers by turning from blue to pink within 30 seconds of exposure to trace amounts of nerve gas.

Nerve gases are colorless, odorless, tasteless, and deadly. While today’s soldiers carry masks and other protective gear, they don’t have reliable ways of knowing when they need them in time. That could change, thanks to the new litmus-like paper sensor made at the University of Michigan.

“To detect these agents now, we rely on huge, expensive machines that are hard to carry and hard to operate,” says Jinsang Kim, associate professor of materials science and engineering.

“We wanted to develop an equipment-free, motion-free, highly sensitive technology that uses just our bare eyes.”

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A paper on their sensor is published online in the journal Advanced Functional Materials and will appear in a forthcoming print edition.

The new sensors combine a group of atoms from a nerve gas antidote with a molecule that changes color when it’s under mechanical stress. The antidote’s functional group binds to the nerve gas, and the resulting stress triggers the color-changing molecule to turn from blue to pink.

In their experiment, the researchers used a less toxic “nerve agent simulant” related to Sarin gas. Their sensors were able to detect its presence at a concentration of 160 parts per billion, which is five times less than the amount that would kill a monkey.

“We believe these paper strips would detect real and potent nerve gases faster and in even lower concentrations considering their high vapor pressure and more volatile properties,” Kim says.

“It feels so gratifying when we, as scientists and engineers, can provide solutions to our society through research.”

The university is pursuing patent protection for the intellectual property, and is seeking commercialization partners to help bring the technology to market.

The research is funded by the National Science Foundation and the National Research Foundation of Korea.

More news from University of Michigan: http://www.ns.umich.edu/new/

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