Evaluation of chemical treatment combined with vacuum and ultrasonication with a water resonance system for reducing Campylobacter on naturally contaminated chicken carcasses
2020
Vetchapitak, Torrung | Shinki, Taisuke | Sasaki, Satomi | Taniguchi, Takako | Luangtongkum, Taradon | Misawa, Naoaki
The present study was conducted to evaluate the efficacy of a new technique for removal of campylobacters from naturally contaminated free-range and broiler chicken carcasses. The carcasses, obtained from commercial processing plants after evisceration, were immersed in 0.1% cetylpyridinium chloride (CPC) or 0.01% sodium hypochlorite (NaOCl) and exposed to a vacuum of −0.02 MPa to remove air from feather. The carcasses were then immersed in a disinfectant solution in a steel container and subjected to ultrasonication with a water resonance system (WRS) at 130 kHz. Tap water was also used instead of the disinfectant, and other carcasses were immersed in each chemical alone. The Campylobacter count on breast and back skin was determined by the most-probable-number (MPN) method. This new treatment using CPC and NaOCl significantly reduced the Campylobacter count on back and breast skin. Treatment with 0.1% CPC combined with vacuum and ultrasonication with the WRS was the most effective, achieving a Campylobacter reduction of 1.36–1.64 log₁₀ MPN/10 g and 0.94–1.16 log₁₀ MPN/10 g on free-range and broiler chicken carcasses, respectively. Scanning electron microscopy (SEM) confirmed that this treatment successfully removed debris from breast skin in comparison to untreated skin. These results suggest that the use of sanitizers employing a combination of vacuum and ultrasonication with a WRS is highly effective for reducing the count of campylobacters on chicken carcasses.
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