Quaternary Ammonium Compounds (QACs) induced inactivation of Pseudomonas spp.: Effect of material surface

Zeinab E. Mousavi*, Orla Condell, Seamus Fanning, Francis Butler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


In this study, we investigated the adaptation of selected Pseudomonas spp. to QACs and monitored the changes in susceptibility to these compounds after serial exposure to QACs. Additional study was performed on the QACs efficacy on cells on different types of surfaces and the data were correlated to surface properties. Results showed that wild type Pseudomonas fluorescens and Pseudomonas fragi exhibited more susceptibility to QACs in comparison with Pseudomonas putida. In addition, the investigations carried out on the adhesion of both wild and adapted strains to different types of surface materials using thermodynamic approaches showed that hydrophilic Pseudomonas strains exhibited highest adhesion to the tile surface, while least adhesion was observed on the stainless steel surface material. A diverse relationship was detected between the thermodynamic affinity of cells to the surfaces (higher water contact angle and energy of adhesion) and cell inactivation. The results can be useful to the hygiene manufacture of food processing facilities or to choose appropriate sanitation strategies for the existing plants.

Original languageEnglish
Pages (from-to)71-78
Number of pages8
JournalFood and Bioproducts processing
Early online date08 Jan 2016
Publication statusPublished - Apr 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.


  • Energy of adhesion
  • Pseudomonas spp.
  • QACs adaptation
  • Quaternary Ammonium Compounds
  • Surface properties

ASJC Scopus subject areas

  • Biotechnology
  • Food Science
  • Biochemistry
  • General Chemical Engineering


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