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Development of a Test Method for Analyzing the Hygienic Performance of Commercial Dishwashers Operating on the Fresh Water Principle

  • Marc-Kevin Zinn , Diana Klapper , Britta von Esmarch-Rummler and Dirk Bockmühl
Published/Copyright: September 5, 2018
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Tenside Surfactants Detergents
From the journal Tenside Surfactants Detergents Volume 55 Issue 5

Abstract

In recent years, the aspect of hygiene has become increasingly important in all areas of daily life. Especially in the areas of gastronomy, nursing homes, kindergartens and hospitals, the hygiene aspect is of particular importance. This study deals with the examination of the hygienic performance of commercial dishwashers with a water replacement system (fresh water dishwashers) using Micrococcus luteus DSM 1790 and the carrier material oat flakes as test soil. After rinsing, the soil is detached from the test items using an elution solution. Furthermore, the sump and the back and side walls of the commercial fresh water dishwasher were examined by contact plates to obtain the microbial count. This approach has been tested for functionality in a series of empirical experiments. In addition, the influence of various commercial detergents on results was examined. It was found that the newly developed method emphasizes the difference between the tested programs. Furthermore, it was found that using a program with longer holding times led to a higher germ reduction in the upper basket than in the lower basket.

Kurzfassung

In den letzten Jahren hat der Aspekt der Hygiene in allen Bereichen des täglichen Lebens an Bedeutung gewonnen. Besonders in den Bereichen der Gastronomie, der Alten- und Pflegeheime, der Kindergärten und Krankenhäuser ist der Hygieneaspekt wichtig. Diese Arbeit befasst sich mit der Überprüfung der Hygieneleistung von gewerblichen Geschirrspülern mit Wasserwechselsystem (Frischwassergeschirrspüler) anhand des Testkeims Micrococcus luteus und des Trägerstoffs Haferflocken. Nach dem Spülen werden die Keime mithilfe einer Elutionslösung von den Prüfgegenständen gelöst. Des Weiteren wurden der Sumpf sowie die Rück- und Seitenwände der gewerblichen Frischwassergeschirrspüler hinsichtlich ihrer Keimzahlen überprüft. Diese Durchführung wurde in empirischen Versuchsreihen auf Funktionalität überprüft. Zusätzlich wurde der Einfluss verschiedener gewerblicher Reiniger auf das Ergebnis untersucht. Es zeigte sich, dass die neu entwickelte Methode den Unterschied zwischen den getesteten Programmen deutlich hervorhebt. Weiterhin konnte festgestellt werden, dass bei einem längeren Spülprogramm im Oberkorb eine höhere Keimreduktion erzielt wird als im Unterkorb.

Key words: Commercial dishwashing; hygienic performance; Micrococcus luteus; heat resistance
Stichwörter: Gewerbliches Geschirrspülen; Hygieneleistung; Micrococcus luteus; Hitzeresistenz
*Correspondence address, Mr. Marc-Kevin Zinn, University of Applied Sciences Rhine Waal, Life Sciences, Marie-Curie-Straße 1, 47533 Kleve, E-Mail:

Marc-Kevin Zinn. He is pursuing a master degree in Food Science at the Rhine-Waal University of Applied Sciences in Kleve and will graduate in 2019. In his Bachelor thesis he focused on hygiene in commercial dishwashers.

Diana Klapper studied biotechnology at the Anhalt Hochschule in Köthen. After graduating in 2001 she joined Miele Professional, Miele & Cie. KG, where she is responsible for the microbiological and hygienic aspects of household appliances, covering the practical investigations in the microbiological laboratory, as well as providing consultation in hygiene matters.

Britta von Esmarch-Rummler obtained her Ph.D. in 2009 at the University of Bonn and worked on a physical method for measuring the drying performance in dishwashers. In 2010 she joined Miele Professional, Miele & Cie. KG. Since 2014, she is responsible for the advance design department including application technology and laboratory in the segment professional dishwashing and medical technology. In addition, she is since February 2017 the director for the innovation management in the business division of Miele Professional.

Prof. Dr. Dirk Bockmühl. Microbiologist, studied biology in Dusseldorf and worked in different positions in the field of laundry and home care in a consumer goods company, before joining the Rhine-Waal University of Applied Sciences in 2010 as a professors for Hygiene and Microbiology.

References

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Received: 2018-03-16
Accepted: 2018-05-03
Published Online: 2018-09-05
Published in Print: 2018-09-14

© 2018, Carl Hanser Publisher, Munich

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents/Inhalt
  3. Editorial
  4. Editorial
  5. Review Articles
  6. Developing an Evidence-Based Approach to Domestic Hygiene Which Protects Against Infection Whilst Also Addressing Sustainability Issues
  7. Honor Thy Lodgers? – Structure and Function of the Human Built Environment Microbiome
  8. Dishwasher
  9. Micrococcus luteus – An Alternative Test Germ for Testing the Hygienic Performance of Commercial Freshwater Dishwashers
  10. Development of a Test Method for Analyzing the Hygienic Performance of Commercial Dishwashers Operating on the Fresh Water Principle
  11. Microbial Reduction in Low Temperature Dishwashing Cycles
  12. Laundry
  13. Laundry Hygiene and Visible Cleanliness: An Attempt to Predict the Antimicrobial Efficacy of Laundering Processes by its Cleaning Performance
  14. Test Methods
  15. Test Method Dependent Efficacy of Antibacterial Textiles
  16. A New Approach for a Practical Assessment of Antimicrobial Surfaces Based on a Stamp Assay to Quantify Transfer Routes of Pathogens
  17. Towards a Lab-Scale Efficacy Test Method for the Evaluation of Hygienic Laundry Rinse-Stage Disinfectants
https://doi.org/10.3139/113.110579
Keywords for this article
Commercial dishwashing; hygienic performance; Micrococcus luteus; heat resistance

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents/Inhalt
  3. Editorial
  4. Editorial
  5. Review Articles
  6. Developing an Evidence-Based Approach to Domestic Hygiene Which Protects Against Infection Whilst Also Addressing Sustainability Issues
  7. Honor Thy Lodgers? – Structure and Function of the Human Built Environment Microbiome
  8. Dishwasher
  9. Micrococcus luteus – An Alternative Test Germ for Testing the Hygienic Performance of Commercial Freshwater Dishwashers
  10. Development of a Test Method for Analyzing the Hygienic Performance of Commercial Dishwashers Operating on the Fresh Water Principle
  11. Microbial Reduction in Low Temperature Dishwashing Cycles
  12. Laundry
  13. Laundry Hygiene and Visible Cleanliness: An Attempt to Predict the Antimicrobial Efficacy of Laundering Processes by its Cleaning Performance
  14. Test Methods
  15. Test Method Dependent Efficacy of Antibacterial Textiles
  16. A New Approach for a Practical Assessment of Antimicrobial Surfaces Based on a Stamp Assay to Quantify Transfer Routes of Pathogens
  17. Towards a Lab-Scale Efficacy Test Method for the Evaluation of Hygienic Laundry Rinse-Stage Disinfectants
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