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A water test for the world
Date:4/28/2014

a bottle and drop it in water."

The material, called pullulan, forms a solid when dry, and protects sensitive agents from oxygen and temperature changes that can render them useless within hours. Until now, such agents have had to be stored at extremely cold temperatures and shipped in vials packed in huge chunks of dry ice, at great cost and inconvenience. Using them has been awkward, bulky and often wasteful.

The new method, described in an article published online in the prestigious European chemistry journal Angewandte Chemie, also holds promise for other applications, such as packaging that could change colour if food is spoiled.

"Can you modify packaging so it has a sensor to tell you if your chicken has gone off?" Brennan asks. "The reason that doesn't exist today is because there's no way you can keep these agents stable enough."

The new method allows the same materials to be stored virtually anywhere for months inside tiny pills that dissolve readily in liquid. The pills are inexpensive to produce and anyone can add them to well water, for an instant reading of pesticides, e. coli or metals, for example.

The new technology can easily be scaled up and find its way to market quickly, says Brennan. Pullulan is already approved for wide commercial use and is mass produced, which can speed the journey to market.
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Contact: Wade Hemsworth
hemswor@mcmaster.ca
905-525-1940 x27988
McMaster University
Source:Eurekalert

Page: 1 2

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