Paper strips can quickly detect toxin in drinking water

A strip of paper infused with carbon nanotubes can quickly and inexpensively detect a toxin produced by algae in drinking water.

Engineers at the University of Michigan led the development of the new biosensor.

The paper strips perform 28 times faster than the complicated method most commonly used today to detect microcystin-LR, a chemical compound produced by cyanobacteria, or blue-green algae. Cyanobacteria is commonly found on nutrient-rich waters.

Microcystin-LR (MC-LR), even in very small quantities, is suspected to cause liver damage and possibly liver cancer. The substance and others like it are among the leading causes of biological water pollution. It is believed to be a culprit of mass poisonings going back to early human history, said Nicholas Kotov, a professor in the departments of Chemical Engineering, Biomedical Engineering and Materials Science and Engineering who led the project.

Water treatment plants—even in developed countries—can't always remove MC-LR completely, nor can they test for it often enough, Kotov said. The biosensor he and his colleagues developed provides a quick, cheap, portable and sensitive test that could allow water treatment plants and individuals to verify the safety of water on a more regular basis.

"The safety of drinking water is a vital issue in many developing countries and in many parts of the United States," Kotov said. "We've developed a simple and inexpensive technology to detect multiple toxins." ...

This research was done in collaboration with the laboratory of professor Chuanlai Xu at Wuxi University in China. It is funded by the National Science Foundation, the Air Force Office of Scientific Research, and the National Institutes of Health, as well as the National Science Foundation of China and the 11th Five Years Key Programs for Science and Technology Development of China.

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

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