ANAHEIM, Calif. â Research funded by the Center for Produce Safety housed at the University of California-Davis, was the topic of discussion at a Fresh Summit 2009 session titled âFood Safety Innovations: Whatâs New and What Does it Really Mean?â
Three of the centerâs research grants recipients talked about their work and shared some results, which they emphasized were only preliminary findings that require more study before they can be classified as definitive.
Astri Wayadanda, assistant professor, Oklahoma State University, Stillwater, Okla., briefs Fresh Summit attendees on current research during the "Food Safety Innovations: Whatâs New and What Does It Really Mean?" workshop at Fresh Summit 2009.
Linda Harris, associate director of the Western Institute for Food Safety and Security at the university, discussed research she has done with E coli and romaine lettuce.
Test lettuce was inoculated with E. coli bacteria to mimic highly contaminated water. Researcher found that the rate of contamination declined rapidly after inoculation and that most of the contamination was on the outer leaves, which often are removed before the product gets to market.
In large studies designed to mimic commercial growing, Steve Koike, plant pathologist and farm adviser for the Monterey (Calif.) County Extension office, said he found that when E. coli was introduced early in the growing process, it had a short persistence rate in the soil and actually became undetectable after 15 days.
Astri Wayadanda, assistant professor at Oklahoma State University, Stillwater, Okla., studied the potential for flies like the leafminer, housefly and blowfly to spread E. coli.
In a 2009 test, none of the flies in a Salinas, Calif., test area were found to be carrying E. coli, though she did not rule out the possibility of fliesâ ability to spread the bacteria.
âWe think flies may play a role, but itâs probably small,â she said.
Flies may have an effect when âa perfect stormâ exists, determined by factors like temperature, humidity and availability of food that attracts flies, she said.
Thereâs no simple answer to the food safety issue, said panelist Jim Gorny, senior adviser for produce safety for the Food and Drug Administrationâs Center for Food Safety and Applied Nutrition.
âNo one piece of research is going to give us the answer,â he said. âItâs a mosaic.â
Bob Whitaker, PMAâs chief scientific officer, moderated the Oct. 3 panel.
Other panel members on hand to analyze the research were Jeff Farrar, chief, food and drug branch of the California Department of Public Health; Sammy Duda, vice president of Duda Farm Fresh Foods Inc., Salinas, Calif.; Mike Burness, vice president of global quality and food safety, of Cincinnati-based Chiquita Brands Internationalâs, Franklin Park, Ill., office.
The Produce Marketing Association contributed $2 million to establish the Center for Produce Safety, a donation that was matched by Salinas-based Taylor Farms California Inc.
To date, the center has funded $1.1 million in food safety research, and an announcement is imminent about an additional $2.5 million in research projects, said Bonnie Fernandez-Fenaroli, the centerâs executive director.