Keeping Ready-To-Eat Foods Safe

From deli meats and hot dogs to fresh-cut produce and dips, ready-to-eat foods merit special interventions.

By Kevin T. Higgins, Managing Editor

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The firm’s sliced-meat system relies on hydraulic pressure to deliver the antimicrobial compound, DeVoll says. It operates in the 300-1,500 slices per minute range.

Ultra pasteurization with steam or immersion is perhaps the most widely used intervention, and it is effective. But energy costs to generate steam or maintain water temperature are high, says DeVol, and that is driving RTE manufacturers to consider chemical sprays and other options. Recent changes in European food regulations to permit antimicrobial agents also are boosting interest in SLIC overseas, he adds.

Under pressure

Before settling on chemical spray, Lower Foods considered the HPP bactericidal option. On-site treatment with high pressure is cost prohibitive unless high utilization is assured, and the network of HPP tolling services is limited, particularly for processors in western states. The situation is rapidly changing, however, particularly along the eastern seaboard.

SafePac in Philadelphia and Stay Fresh Foods in Connecticut each added a second HPP press last year to meet growing demand, and two additional large-capacity presses are planned by Universal Pasteurization in suburban Philadelphia. In November, the underserved New York metro area witnessed the start-up of its first tolling service when New Jersey Frozen Storage (NJFS) commenced operations at its Nutrifresh Services division.

“It’s the new age of food and beverage,” proclaims Chris Jenkins, Nutrifresh’s director of HPP operations in Edison, N.J. “Clean labels are really pushing HPP.”

A former USDA inspector, Jenkins was first exposed to HPP 10 years ago, first while assuring regulatory compliance at Astra Foods in Upper Darby, Pa., and then at SafePac, the HPP pasteurization subsidiary of Vincent Giordano Corp. Thermal processing of packaged RTE foods costs less on a per-pound basis, he concedes, but when the added labor, preservatives and test-and-hold expenses are factored in, the difference narrows. Plus, shelf life of up to 120 days with HPP means fewer returns. “It’s reducing cost,” he says, adding, “USDA loves this.”

Nutrifresh’s 350-liter capacity press from Hiperbaric was followed in March by the installation of a 525-liter machine, the largest HPP system made and the first Hiperbaric 525L installed by a toller. Together, the machines provide more than 50 million lbs. a year of capacity. Located within spitting distance of the nation’s third largest port (and second largest point of entry for imports), Nutrafresh and NJFS’s adjacent 200,000 sq. ft. of freezer capacity are well situated to serve both importers and domestic processors of RTE meats and other food products

More arrows in quiver

Meat and poultry aren’t the only RTE foods on the market; the designation is being applied to an expanding array of convenience products. Washed, sliced and bagged fruits and vegetables qualify as RTE. So do dips. All those products are candidates for pathogenic contamination, and all have experienced sometimes-disastrous recalls (did you see our April story? Food Safety’s Smallest Challenge). The April recall of 30,000 cases of Sabra Dipping Co. products after a positive test for Listeria sent hummus processors flocking to Nutrafresh’s door.

Lethality interventions must be approved by FDA, and the agency can work in mysterious ways. Bagged spinach and iceberg lettuce can be irradiated, but bagged salads also contain other vegetables, and FDA doesn’t permit irradiation of other salad components.

“Irradiation is a viable option, but it’s dependent on getting (FDA) approval,” observes Harlan Clemmons, president and COO of Sadex Corp. Chemical changes and other side effects have to be analyzed, and that can be a long time coming: 12 years lapsed between the agency’s approval of irradiation for red meat and the go-ahead for poultry.

Defense contractor Titan Corp. built Sadex’s electron-beam treatment center in a Sioux City, Iowa, cold storage facility, opening its doors in 2000 under the Surebeam banner. Maligned as a “Frankenfood” process and dogged by public misunderstanding, irradiation never capitalized on its promise as a food safety step -- although, according to Clemmons, early adopters such as Schwan’s Home Service and Omaha Steaks continue to use Sadex’s services, as does the retailer Wegmans.

Those applications involve fresh and frozen beef, and Sioux City is in the heart of beef country. The heartland isn’t home to RTE spinach and other convenience produce, of course. Packers in California’s Salinas Valley and in Yuma County, Ariz., also are concerned with pathogen contamination. “There’s been interest,” says Clemmons, “but based on where we’re located, the timeline (for treatment) is not necessarily ideal.”

Satisfying USDA’s log-reduction hurdle rates isn’t an issue with ultraviolet light in the C wavelength, suppliers say. More problematic is finding a processor willing to validate log reduction from a UV-C system.

“Nobody wants to be first with this,” grumps Buddy Ward, business support manager with Prime Equipment Group Inc., Columbus, Ohio. He’s guardedly optimistic about an upcoming trial at a poultry operation that hopes to reduce the amount of chemical additives currently used. But until a system is permanently installed, “we’re still in proof mode.”

Whether UV-C or another intervention is used, proper design and engineering is critical. Unfortunately, some vendors have installed systems without understanding the distinct challenges in every facility, Ward complains, giving the technology a black eye in the process.

“You’re not going to kill all the bugs, but you can control them,” he concludes. That’s particularly valuable with RTE meat and poultry, where “fear of the R (recall) word” puts manufacturer “in a constant state of panic.”

Recalls don’t necessarily destroy a company, but they have doomed more than a few individuals’ careers. Slowing down the line is not an option, but there are a number of new ways to keep inspectors at bay and ready-to-eat foods safe.

Milwaukee-based American Pasteurization Co. was a pioneer in HPP tolling services in 2005. Today’s machines boast considerably more automation and increased capacities.

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