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New treatment makes fruit juices safer

New approach also keeps juice tasting fresh

Washington D.C., August 21 -- Carbon dioxide, the stuff that makes soft drinks fizzy, can also make fresh fruit juice safer to drink, according to researchers at the University of Florida. The findings were reported here today at the 220th national meeting of the American Chemical Society, the world's largest scientific society.

Treating juice with carbon dioxide works as well as heat pasteurization to eliminate bacteria without altering the flavor, say Stephen Hill and Dilek Kincal, graduate students at the university. They conducted their research under the direction of Maurice Marshall, Ph.D., and Murat Balaban, Ph.D., professors at the University of Florida Institute of Food and Agricultural Sciences.

Tasters could not tell the difference between fresh-squeezed orange juice and carbon dioxide-treated juice, Marshall says. An added benefit of the carbon dioxide treatment is that it also improves the appearance of fresh-squeezed orange juice. The process deactivates an enzyme that causes the juice to separate into a transparent, watery layer at the top and a pulpy mass at the bottom.

Ninety-eight percent of juices in the United States are heat pasteurized, the same method used to treat milk, according to the U.S. Food and Drug Administration. Less than two percent of juices do not get pasteurized and can cause food poisoning.

"Right now heat pasteurization is the only game in town to minimize pathogens in juice," Marshall says.

The heat required for pasteurization has the effect of making fruit juice taste "slightly cooked," according to Marshall. Other alternative methods to pasteurization -- UV radiation, high pressure and pulsed electric fields -- also raise the temperature of the juice, but for a much shorter period of time.

Using carbon dioxide instead of heat preserves the flavor of the juice while still killing pathogens. Pressurized liquid carbon
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Contact: Charmayne Marsh
y_marsh@acs.org
202-872-4445
American Chemical Society
21-Aug-2000


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