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New antibiotic could make food safer and cows healthier
Date:3/19/2012

CHAMPAIGN, Ill. Food-borne diseases might soon have another warrior to contend with, thanks to a new molecule discovered by chemists at the University of Illinois. The new antibiotic, an analog of the widely used food preservative nisin, also has potential to be a boon to the dairy industry as a treatment for bovine mastitis.

The antibiotic nisin occurs naturally in milk, a product of bacteria resident in the cow's udder. It helps keep milk from spoiling and kills a broad spectrum of bacteria that cause food-borne illness, most notably listeria and clostridium. It was approved as a food additive in 1969, and since then has become prevalent in the food industry in more than 50 countries.

"It's good to know that there are natural products added to our food that protect us from diseases," said lead researcher Wilfred van der Donk, a chemistry professor at Illinois. "Many people probably don't even realize that, or think it's some kind of a non-natural chemical. Last summer we had the listeria outbreak, and that's a good example of people dying from pathogens in food. You don't hear of such outbreaks often, and that's in part because of the compounds that are added to food to kill the pathogens."

Nisin also shows promise as a treatment for bovine mastitis, an infection in cows that costs the dairy industry billions each year since milk produced during and shortly after antibiotic treatment has to be thrown out. Since nisin already is present in low levels in milk, farmers using nisin to treat mastitis may not need to discard milk or meat from recently treated animals.

However, for all its utility, nisin has drawbacks. It's produced in an acidic environment, but it becomes unstable at the neutral pH levels needed for many foods or pharmaceuticals. It also becomes unstable at higher temperatures, limiting its uses.

While studying the genome of another bacterium that lives at high temperatures, van der Donk's group fou
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Contact: Liz Ahlberg
eahlberg@illinois.edu
217-244-1073
University of Illinois at Urbana-Champaign
Source:Eurekalert  

Page: 1 2 3

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