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Updated: Jan 28, 2026
03:10
Pilot In Vitro Study to Assess Cleaning Ability and Effects of Different Decontamination Methods on Implant Surfaces
Published on: November 21, 2025
211
Simulator Technique for Assessing the Bacteriological Control of Food Equipment Surfaces by Cleaning Systems
D G Dunsmore1, D A Westwood1, D B Jay1
1National Dairy Laboratory, Ruakura Agricultural Research Centre, Private Barg, Hamilton, New Zealand.
Journal of Food Protection
|March 7, 2019
Summary
A novel cleaning simulator effectively assessed food equipment cleaning systems
Area of Science:
- Food safety and microbiology
- Sanitation science
- Industrial cleaning technology
Background:
- Controlling surface bacteria on food equipment is crucial for public health.
- Existing cleaning systems require rigorous evaluation for efficacy.
- Understanding bacterial resistance to sanitizers informs cleaning protocol development.
Purpose of the Study:
- To develop and validate a cleaning simulator for assessing bacterial control on food equipment surfaces.
- To evaluate the effectiveness of different cleaning systems against common foodborne bacteria.
- To identify bacterial species suitable for use as soil contaminants in cleaning simulations.
Main Methods:
- A sequential soiling and cleaning protocol was implemented in a controlled test cell environment.
- Food equipment test pieces were exposed to milk inoculated with selected bacterial species.
- Bacteriological and gravimetrical analyses were performed to evaluate cleaning efficacy.
- Bacterial resistance to various sanitizers (iodophor, quaternary ammonium, chlorhexidine) was assessed.
Main Results:
- Five bacterial species (Streptococcus faecalis, Micrococcus luteus, Enterobacter aerogenes, Pseudomonas aeruginosa, Escherichia coli) were evaluated for soil contamination suitability.
- Pseudomonas aeruginosa, Escherichia coli, and Micrococcus luteus showed high resistance to an iodophor sanitizer.
- Pseudomonas aeruginosa and Streptococcus faecalis exhibited the highest resistance to quaternary ammonium and chlorhexidine sanitizers.
- All tested organisms demonstrated suitable growth rates in milk for contamination studies.
Conclusions:
- The developed cleaning simulator provides a reliable method for evaluating food equipment cleaning systems.
- Specific bacterial species demonstrate differential resistance to common sanitizers, impacting cleaning efficacy.
- Streptococcus faecalis, combined with either Escherichia coli or Enterobacter aerogenes, are suitable milk contaminants for simulator experiments.
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