Wear of food contact surfaces through abrasion may increase the surface roughness and introduce different topographical features. Both of these properties may enhance retention of soil and microorganisms
and affect the surface cleanability. To test this hypothesis, stainless steel surfaces with topographical features and surface roughness (Ra) values simulating those of worn in-use surfaces were prepared.
Surfaces were imaged and Ra values determined using atomic force microscopy (AFM). These ranged from 23 to 900 nm. Surfaces were sprayed with standardized cell suspensions of Pseudomonas aeruginosa
or Staphylococcus aureus and allowed to air dry and were then cleaned using a nonionic detergent delivered via a manual linear cleaning device. There was a 2-log reduction in numbers attached after
cleaning, but there was no significant difference (P ≥ 0.05) between the cleanability of the surfaces in terms of the numbers of cells per unit area remaining after cleaning, although cells appeared
to be retained within topographical features. Thus, the simulated effect of wear of a hygienic food contact surface did not affect its cleanability after a one-off microbiological soiling event. AFM provided
hitherto unavailable information on the topography of worn stainless steel surfaces. In future work, the surfaces will be repeatedly challenged with an organic soil-microorganism mixture after cleaning
events, to provide a more rigorous, realistic test.
Document Type: Research Article
Departments of Biological Sciences and Chemistry and Materials, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK
Publication date: August 1, 2001
More about this publication?
IAFP members must first sign in on the right to access full text articles of JFP First published in 1937, the Journal of Food Protection®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.
Print and online subscriptions are available to Members and Institutional subscribers. Online visitors who are not IAFP Members or journal subscribers will be charged on a pay-per-view basis. Information can be obtained by calling +1 800.369.6337; +1 515.276.3344; fax: +1 515.276.8655, E-mail: firstname.lastname@example.org or Web site: www.foodprotection.org