TY - JOUR
T1 - Modified stainless steel surfaces targeted to reduce fouling - Evaluation of fouling by milk components
AU - Rosmaninho, Roxane
AU - Santos, Olga
AU - Nylander, Tommy
AU - Paulsson, Marie
AU - Beuf, Morgane
AU - Benezech, Thierry
AU - Yiantsios, Stergios
AU - Andritsos, Nikolaos
AU - Karabelas, Anastasios
AU - Rizzo, Gerhard
AU - Mueller-Steinhagen, Hans
AU - Melo, Luis F.
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
KW - beta-lactoglobulin
KW - calcium phosphate
KW - modified stainless steel
KW - fouling
KW - Bacillus subtilis
KW - Bacillus cereus
U2 - 10.1016/j.jfoodeng.2006.09.008
DO - 10.1016/j.jfoodeng.2006.09.008
M3 - Article
SN - 0260-8774
VL - 80
SP - 1176
EP - 1187
JO - Journal of Food Engineering
JF - Journal of Food Engineering
IS - 4
ER -