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Pet Food Processing / Pet Food News / Pet Food Safety
On March 8, 2013

Extru-Tech completes first petfood extrusion safety validation study

Industry-first study used production-scale extruder, dry petfood to prove extrusion's effectiveness in controlling Salmonella

Extru-Tech recently completed an industry-first scientific validation study proving the kill/lethality step of the extrusion process in its Level 2 Bio-Safety Extrusion lab in Manhattan, Kansas, USA. Extru-Tech’s scientific validation proved the petfood extrusion system as an effective control against Salmonella.

Extru-Tech analyzed key operational parameters to consider when scientifically validating a typical extruded petfood process:

• Equipment scale – Production rates
• Equipment configuration – Barrel screw stack-up, preconditioner paddle configuration
• Formulation
• Product specification

Extru-Tech then reviewed the possible paths for validation of a typical petfood process in order of preference and viability:

• Pilot plant – Most accepted and least risk
• In-plant surrogate
• In-plant pathogenic
• Laboratory validation
• Scientific Literature – Least accepted and most risk

“Extru-tech is using actual equipment that you would find in most petfood plants in a bio-hazard laboratory or a pilot plant,” said Jim Marsden, PhD, regents distinguished professor at Kansas State University. “Raw materials can be inoculated with Salmonella or other pathogens and the effect of the extrusion process can be exactly quantified. This process is a breakthrough for the petfood industry.”

Based on the design criteria, a BSL-2 pilot plant was outfitted with an E525 production-scale extruder system and the equipment was configured for the production of an industry-generic, low-moisture, dry-expanded petfood. The E325s typically used produce 200 to 600 pounds of petfood per hour, whereas the E525 chosen can produce nearly 8,000 pounds per hour (in terms of typical petfood). The industry-generic petfood formula selected was charged with a 3 serotype cocktail of Salmonella, an inoculant that represents typical contamination events in the manufacturing process.

All three replications of the challenge study resulted in a log reduction of Salmonella that exceeded the 5-log reduction requirement of a CCP allocation. Extru-Tech also discovered that many readily available and scientific methods of inoculation rendered a result that was not truly representative of a contamination event because of the method by which the raw material was inoculated.

“Extru-tech is documenting the parameters that are required to deactivate Salmonella in the extrusion process,” said Dr. Marsden. “There are other production steps that follow where Salmonella could recontaminate the product. Extru-tech is looking at those additional steps to identify interventions that could be applied downstream to prevent recontamination.”

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