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UGA wash kills foodborne pathogens in minutes By Terry Hastings

University of Georgia researchers have developed an effective technology for reducing contamination of dangerous bacteria on food.

The new antimicrobial wash rapidly kills Salmonella and E. coli O157:H7 on foods ranging from fragile lettuce to fruits, poultry products and meats. It is made from inexpensive and readily available ingredients that are recognized as safe by the U.S. Food and Drug Administration.

The technology has commercial application for the produce, poultry, meat and egg processing industries. It is available for licensing from the UGA Research Foundation, Inc., which has filed a patent application on the new technology.

The Centers for Disease Control and Prevention estimates that in the U.S. alone foodborne pathogens are responsible for 76 million illnesses every year. Of the people affected by those illnesses, 300,000 are hospitalized and more than 5,000 die.

These widespread outbreaks of foodborne illnesses are attributed in part to the fast-paced distribution of foods across the nation. Recently, raw tomatoes caused an outbreak of salmonellosis that sickened more than 300 people in at least 28 states and Canada.

Currently, a chlorine wash is used in a variety of ways to reduce harmful bacteria levels on vegetables, fruits and poultry, but because of chlorine’s sensitivity to food components and extraneous materials released in chlorinated water treatments, many bacteria survive.

Chlorine is toxic at high concentrations, may produce off-flavors and an undesirable appearance of certain food products, and it can only be used in conjunction with specialized equipment and trained personnel. In addition, chlorine may be harmful to the environment.

“We can’t rely on chlorine to eliminate pathogens on foods,” said Michael Doyle, one of the new technology's inventors and director of UGA’s Center for Food Safety in Griffin, Ga. “This new technology is effective, safe for consumers and food processing plant workers, and does not affect the appearance or quality of the product. It may actually extend the shelf-life of some types of produce.”

A UGA College of Agricultural and Environmental Sciences professor, Doyle is an internationally recognized authority on food safety. His research focuses on developing methods to detect and control foodborne bacterial pathogens at all levels of the food continuum, from the farm to the table.

He has served as a scientific advisor to many groups, including the World Health Organization, the Food and Drug Administration, the U.S. Department of Agriculture, the U.S. Department of Defense and the U.S. Environmental Protection Agency.

The new antimicrobial technology, developed by Doyle and UGA CFS researcher Tong Zhao, uses a combination of ingredients that kills bacteria within one to five minutes from application. It can be used as a spray and immersion solution, and its concentration can be adjusted for treatment of fragile foods such as leafy produce, more robust foods like poultry, or food preparation equipment and food transportation vehicles.

“The effectiveness, easy storage and application, and low cost of this novel antibacterial make it applicable not only at food processing facilities, but also at points-of-sale and at home, restaurants and military bases,” said Gennaro Gama, the UGARF technology manager in charge of licensing the technology. “The development of this technology is timely, given the recent, sequential outbreaks of foodborne pathogens.”

(Terry Hastings is the director of communications for the UGA Office of the Vice President for Research.)

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