E Sinde’s scientific contributions

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Publications (1)


Attachment of Salmonella spp. and Listeria monocytogenes to stainless steel, rubber and polytetrafluorehtylene: The influence of free energy and the effect of commercial sanitizers
  • Article

August 2000

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176 Reads

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339 Citations

Food Microbiology

E Sinde

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Bacteria and material surfaces were characterized with respect to their hydrophobicity and surface free energy using the contact angle method. Salmonella strains showed higher hydrophobicity and lower surface free energies than Listeria monocytogenes strains. Polytetrafluorethylene was the most hydrophobic material (and had the lowest surface free energy), followed by rubber and stainless steel. Bacteria attached in higher numbers to the more hydrophobic materials. Bacterial adherence could not be correlated with surface free energies or contact angles of bacteria, although L. monocytogenes strains attached in higher numbers than Salmonella strains to all of the materials tested. The cleaning of materials with commercial sanitizers resulted in a decrease of their contact angles (and an increase of their surface free energies), accompanied by a reduction in the number of adhered bacteria in comparison with the standard conditions. The degree of reduction in bacterial adherence varied with the bacteria, the substrate material and the sanitizer tested. Quaternary ammonium compounds were more effective against Salmonella attachment than L. monocytogenes attachment. Diethylenetriamine showed similar efficacy against attachment of both bacteria. Polytetrafluorethylene showed the greatest reduction in attachment after being washed with commercial sanitizers. It is concluded that stainless steel is less adherent than rubber or polytetrafluorethylene and should be preferred in the food industry when possible. On the other hand, polytetrafluorethylene seems to be more easily sanitized. Since effectiveness of sanitizers in the reduction of bacterial adherence was dependent upon the bacteria and the materials studied, the use of mixtures of sanitizers would help to control bacterial adherence in the food industry.

Citations (1)


... Polyvinyl chloride, ceramic tiles, and stainless steel are common hospital surfaces. Properties such as porosity, hydrophobicity, and free energy of the surface determine how microorganisms adhere and the potential for biofilm formation [27,28]. According to Lagha et al., stainless steel can support biofilm formation and cross-contamination, while materials like ceramics or PVC can also be sources of disease transmission from inanimate surfaces [29]. ...

Reference:

Microbiological Characteristics of Bacillus subtilis Species and their Relationship with Hospital Infections
Attachment of Salmonella spp. and Listeria monocytogenes to stainless steel, rubber and polytetrafluorehtylene: The influence of free energy and the effect of commercial sanitizers
  • Citing Article
  • August 2000

Food Microbiology