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Modified stainless steel surfaces targeted to reduce fouling - Evaluation of fouling by milk components

På svenska

Author

  • Roxane Rosmaninho
  • Olga Santos
  • Tommy Nylander
  • Marie Paulsson
  • Morgane Beuf
  • Thierry Benezech
  • Stergios Yiantsios
  • Nikolaos Andritsos
  • Anastasios Karabelas
  • Gerhard Rizzo
  • Hans Mueller-Steinhagen
  • Luis F. Melo
Show all

Summary, in English

Several stainless steel based surfaces with different properties were evaluated according to their fouling behaviour for different dairy products under different conditions. Surface properties were obtained by the following modification techniques: SiF3+, MoS22+ and TiC ion implantation; diamond-like carbon (DLC) sputtering; DLC, DLC-Si-O and SiOx, plasma enhanced chemical vapor Deposition (PECVD); autocatalytic Ni-P-PTFE and silica coating. Aqueous solutions that simulate milk (SMUF - simulated milk ultrafiltrate for the mineral components, beta-lactoglobulin for the protein components and FMF - fouling model fluid for complex milk systems) were used to study the fouling behaviour during pasteurisation. Bacteriological deposition studies were also performed with two heat resistant strains of Bacillus. The experiments were carried out at laboratory scale for the evaluation of calcium phosphate and protein deposition, and at pilot scale for adhesion of bacteria and deposits from complex milk systems. In all cases, the fouling behaviour was affected by the surface material, although in different ways for the deposition or the cleaning phases. For the non-microbiological deposits (calcium phosphate, whey protein and FMF milk-based product), the Ni-P-PTFE surface was the most promising one, since it generally promoted less deposit build up and, in all cases, was the easiest to clean. On the other hand, for bacterial adhesion, the most suitable surface was the ion implanted (TiC) surface, which also showed less spores after the cleaning process. (c) 2006 Elsevier Ltd. All rights reserved.

Department/s

Publishing year

2007

Language

English

Pages

1176-1187

Publication/Series

Journal of Food Engineering

Volume

80

Issue

4

Document type

Journal article

Publisher

Elsevier

Topic

  • Food Engineering
  • Physical Chemistry

Keywords

  • beta-lactoglobulin
  • calcium phosphate
  • modified stainless steel
  • fouling
  • Bacillus subtilis
  • Bacillus cereus

Status

Published

ISBN/ISSN/Other

  • ISSN: 0260-8774