Milk protein, clay used to make biodegradable foam plastic substitute

WASHINGTON - Scientists have developed a new ultra-light biodegradable foam plastic material made from two unlikely ingredients: The protein in milk and ordinary clay.

The new substance could be used in furniture cushions, insulation, packaging, and other products.

David Schiraldi and colleagues explain that 80 percent of the protein in cow milk is a substance called casein, which already finds uses in making adhesives and paper coatings.

But casein is not very strong, and water can wash it away. To beef up casein, and boost its resistance to water, the scientists blended in a small amount of clay and a reactive molecule called glyceraldehyde, which links casein’s protein molecules together.

The scientists freeze-dried the resulting mixture, removing the water to produce a spongy aerogel, one of a family of substances so light and airy that they have been termed “solid smoke.”

To make the gossamer foam stronger, they cured it in an oven, then tested its sturdiness. They concluded that it is strong enough for commercial uses, and biodegradable, with almost a third of the material breaking down within 30 days.

The finding was reported in the ACS’ Biomacromolecules, a monthly journal. (ANI)