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Efficacy of knife disinfection techniques in meat processing
J Leps1, K Einschütz, N Langkabel
1Panel Veterinary Public Health, Institute of Meat Hygiene and Technology, Faculty of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany. fleischhygiene@vetmed.fu-berlin.de
Meat Science
|June 8, 2013
Summary
Disinfecting meat processing knives can be achieved at lower temperatures using lactic acid or ultrasound. These methods, including a 40°C water bath with lactic acid and ultrasound, effectively reduce bacterial contamination.
Area of Science:
- Food safety and microbiology
- Industrial hygiene in food processing
Background:
- EU Regulation 853/2004 mandates hot water disinfection (+82°C) for meat processing knives.
- Alternative disinfection methods require proven equivalent efficacy.
Purpose of the Study:
- To evaluate alternative knife disinfection procedures for meat processing.
- To identify effective lower-temperature disinfection methods.
Main Methods:
- Testing various time-temperature combinations with water, lactic acid (2%), and ultrasound.
- Inoculating steel plates with a standardized bacterial mix simulating pig slaughter contamination.
- Assessing bacterial reduction using a wet-dry-swab technique.
Main Results:
- Effective disinfection below detection limits achieved with: 70°C water (10s), 60°C water + ultrasound (5s), 40°C water + 2% lactic acid (10s), and 40°C water + ultrasound + 2% lactic acid (5s).
- Lactic acid significantly reduced required temperatures for effective sterilization.
- Non-hazardous food-safe additives enable lower-temperature disinfection.
Conclusions:
- Lower-temperature disinfection of meat processing knives is feasible.
- Lactic acid and ultrasound offer effective alternatives to high-temperature methods.
- Food-safe additives enhance disinfection efficiency at reduced temperatures.
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