Influence of physicochemical properties on the hygienic status of stainless steel with various finishes |
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| Authors: | Christine Faille Jeanne‐Marie Membre Jean‐Pierre Ussier Marie‐Noelle Bellon‐Fontaine Brigitte Carpentier Marie‐Annick Laroche |
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| Affiliation: | 1. INRA Laboratoire de Génie des Procédés et Technologie Alimentaires , 369 Rue Jules Guesde, BP 39, Villeneuve d'Ascq Cedex, F‐59651, France Fax: E-mail: faille@lille.inra.fr;2. INRA Laboratoire de Génie des Procédés et Technologie Alimentaires , 369 Rue Jules Guesde, BP 39, Villeneuve d'Ascq Cedex, F‐59651, France;3. INRA Laboratoire de Bioadhésion et d'Hygiène des Matériaux , 25 Avenue de la République, Massy, F‐91300, France;4. AFSSA‐LERPAC , BP 332, Maisons‐Alfort Cedex, F‐94709, France;5. CETIM , 52, Avenue Felix Louat, BP 37, Senlis Cedex, F‐60304, France |
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| Abstract: | 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. |
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| Keywords: | stainless steel roughness topography hydrophobicity hygienic status Bacillus spores |
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