期刊
LWT-FOOD SCIENCE AND TECHNOLOGY
卷 69, 期 -, 页码 131-138出版社
ELSEVIER
DOI: 10.1016/j.lwt.2016.01.035
关键词
Stainless steel; Bacterial adhesion; Listeria monocytogenes; Salmonella Enteritidis; Free energy
资金
- Coordination for the Improvement of Higher Education Personnel (CAPES) of Brazil
- Ralf Winter Company
Bacterial attachment to stainless steels AISI (American Iron and Steel Institute) 304 and 316, the preferred material choices for food equipment, is a very important food safety consideration. The purpose of the present study was to investigate the attachment of two important food pathogens on commercial samples of these surfaces focusing on the influence of material topography characterized by Atomic Force Microscopy and considering the hydrophobicity and free energy of interaction, determined by measuring contact angle and application of thermodynamic theory principles. Results showed that S. Enteritidis and Listeria monocytogenes were able to attach to samples of stainless steels, however, initially (t = 0), the number of adhered S. Enteritidis (2.55 log CFU/cm(2)) was higher than L. monocytogenes (1.68 logCFU/cm(2)). Corroborating these results, the adhesion was thermodynamically more favorable for S. Enteritidis. Even though, the number of adhered cells were similar on both stainless steels samples, negative total energy was higher on AISI 316, for both bacteria. Moreover, the surface's roughness (0.032 pm and 0.021 gm) and hydrophobicity of cells and materials did not show a positive correlation with bacterial adherence. (c) 2016 Published by Elsevier Ltd.
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