Preventing Listeria contamination in industrial deli meat slicing operations
The advent of high-throughput slicers has revolutionized the deli meat industry by enabling efficient, large-scale production. However, the design and complexity of these machines necessitate effective food safety measures for controlling Listeria, as their numerous nooks and crannies increase the risk of bacterial growth and potential cross-contamination to the sliced deli meat products.
Preventing Listeria contamination across high-speed deli meat slicing lines
An Australian producer of deli meats succesfully implemented bacteriophage solution, Phageguard L (PGL), to protect its slicing operations against Listeria. The slicing operation, which processes thousands of deli meat slices daily, required a solution capable of meeting the demands of high-volume production. Additionally, preserving product quality and ensuring worker safety were key priorities for the company. Phageguard L addresses these challenges by offering a non-chemical and harmless solution that leverages bacteriophage (phage) technology to control Listeria in processing lines. Phages are recognized for their precision, targeting specific bacteria while leaving the organoleptic properties and beneficial bacteria of treated products unaffected.
To evaluate the effectiveness, a trial period was conducted to analyze contamination levels across multiple batches before and after implementing Phageguard L. Strategically placed nozzles at the slicer blades applied a low concentration of Phageguard L continuously during production. This application method ensures the inactivation of Listeria on the slicing machine and prevented cross-contamination of one deli meat slice to the next. Trial results confirmed a substantial reduction in contamination. Before the implementation of Phageguard L, periodic testing revealed sporadic occurrences of Listeria monocytogenes contamination on the final deli meat product. Following the adoption, contamination levels dropped to undetectable levels, with no Listeria-positive results reported in finished products over the past 12 months.
Key factors behind the success of Phageguard L application in the slicing operation:
Application on slicer blades: The continuous application of a low concentration of Phageguard L at the contact point with deli meats ensures that Listeria monocytogenes does not accumulate or spread via the slicing machine.
Prevention of cross-contamination through protein residue: The liquid phage solution ensures that protein residues on the slicer surface remain free of active Listeria monocytogenes.
Advancing Listeria management with natural phage technology
Listeria remains one of the most persistent challenges in the food industry, particularly in ready-to-eat products like sliced deli meats. A spokesperson for the Australian producer stated:
"With Phageguard L, we’ve been able to safeguard our products against Listeria without compromising production efficiency, worker safety, or product and equipment quality. It’s a solution that fits seamlessly into our operations."
The consistent results achieved in the slicing operation of this deli meat producer underscore the effectiveness of Phageguard L for controlling and inactivating Listeria monocytogenes in deli meat slicing lines.