Complex solutions for produce wash water

07/13/2012 08:32:00 AM
Vicky Boyd

Vicky Boyd, Staff WriterPathogen-contaminated wash water has been linked to a handful of foodborne illness outbreaks over the years, including last year’s listeria outbreak at a Colorado cantaloupe grower-packer-shipper.

But reducing the risks isn’t as simple as dumping in an appropriate amount of disinfectant and walking away.

Wash water and its interaction with produce, organic matter associated with produce and even other micro-organisms found on produce is a complex subject with no single answer.

This was evident as a handful of researchers presented updates on their projects at the Center for Produce Safety’s third annual Produce Research Symposium June 27 in Davis, Calif.

“The researchers don’t always agree,” said Bob Whitaker, chief science and technology officer with the Produce Marketing Association, Newark, Del., as he reviewed the projects at the PMA’s Gold Circle Breakfast the next morning.

“One size doesn’t fit all.”

Because of potential risks and complexities, Whitaker said PMA will focus on wash water in educational sessions during the next five months.

The subject also is a research priority for the Davis-based Center for Produce Safety, said Bonnie Fernandez-Fenaroli, executive director.

One thing researchers did agree upon was that wash water shouldn’t be viewed as a kill step.

Instead, growers should start with GAPS, or good agricultural practices, in the field to minimize the risk of foodborne pathogens. Similar food-safety steps should be followed throughout the food chain.

“The take-home message is it’s quality in, quality out,” said Keith Warriner, a food science professor at the University of Guelph in Ontario.

“If you get bad quality going in, you get bad quality going out.”

At best, wash water should not be a source of cross-contamination.

As its name implies, wash water is intended to remove dirt and other impurities from produce including tomatoes, peppers, cantaloupe and leafy greens.

If unsafe water is used, it can contaminate everything it contacts.

Even if you start with safe water, cross-contamination may occur should one piece of produce carry pathogens that are washed off.

“Typically 90% of the microbial load is shed. Therefore, we need to come up with means to decrease levels to prevent cross-contamination,” said Elliot Ryser, a food science professor at Michigan State University, East Lansing.

That’s where a disinfectant comes in, frequently some form of chlorine.


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