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Influence of physicochemical properties on the hygienic status of stainless steel with various finishes

2000; Taylor & Francis; Volume: 15; Issue: 4 Linguagem: Inglês

10.1080/08927010009386317

1029-2454

Christine Faille, Jeanne‐Marie Membré, Jean‐Pierre Ussier, Marie‐Nöelle Bellon‐Fontaine, Brigitte Carpentier, Marie‐Annick Laroche, Thierry Bénézech,

Surface Modification and Superhydrophobicity

The relative hygienic status of 16 stainless steel surfaces, characterised by topography and surface free energy was investigated. B. thuringiensis spores suspended in Bechamel sauce was chosen as the test fouling suspension. Surface topography was assessed using 10 standardised roughness parameters, along with scanning electron microscope observations. The number of residual adhering spores after a fouling and cleaning in place procedure was found to be influenced by the topography of the stainless steel surface, but not by the surface free energy. Among the various roughness parameters, RA, RRR RPK and RVK were shown to be related to the hygienic status. Microscopic observations demonstrated the influence of the shape and size of surface irregularities on the level of residual soil after cleaning. This confirms that the use of only one roughness parameter, usually RA, is not sufficient in defining the hygienic status of stainless steel surfaces.