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The researchers will present their results today at the 256th National Meeting & Exposition of the American Chemical Society (ACS).
"Paper has unique advantages as a material for biosensors," says Seokheun (Sean) Choi, Ph.D., who is presenting the work at the meeting. "It is inexpensive, disposable, flexible and has a high surface area. However, sophisticated sensors require a power supply. Commercial batteries are too wasteful and expensive, and they can't be integrated into paper substrates. The best solution is a paper-based bio-battery."
Researchers - Biosensors - Diagnosis - Diseases - Health
Researchers have previously developed disposable paper-based biosensors for cheap and convenient diagnosis of diseases and health conditions, as well as for detecting contaminants in the environment. Many such devices rely on color changes to report a result, but they often aren't very sensitive. To boost sensitivity, the biosensors need a power supply. Choi wanted to develop an inexpensive paper battery powered by bacteria that could be easily incorporated into these single-use devices.
So Choi and his colleagues at the State University of New York, Binghamton made a paper battery by printing thin layers of metals and other materials onto a paper surface. Then, they placed freeze-dried "exoelectrogens" on the paper. Exoelectrogens are a special type of bacteria that can transfer electrons outside of their cells. The electrons, which are generated when the bacteria make energy for themselves, pass through the cell membrane. They can...
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