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Washing Alone is Not Enough to Destroy Harmful Bacteria in Veggies
April 11, 2008 at 5:39 PM
Diet & Nutrition News
A number of studies have revealed that certain disease-causing bacteria, such as Salmonella and E. coli, can avoid these chemical sanitizers, as they can easily penetrate inside the leaves of lettuce, spinach and other vegetables and fruit, where surface treatments cannot reach. Besides, microbes can organize themselves into tightly knit communities called biofilms that coat fruits and vegetables and protect the bacteria from harm.
However, scientists at the U.S. Department of Agriculture have now cited that that a technique, called irradiation, a food treatment currently being reviewed by the FDA, can effectively kill such internalized pathogens that dodge conventional chemical sanitizers.
During irradiation, food is exposed to a source of electron beams, creating positive and negative charges. It disrupts the genetic material of living cells, inactivating parasites and destroying pathogens and insects in food, including E. coli and Salmonella.
Conducted under the direction of Brendan A. Niemira, Ph.D., a microbiologist with the USDA's Agricultural Research Service in Wyndmoor, Pa., the study revealed that this technique can prove to be useful in reducing the numbers of foodborne illnesses.
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