Journal
BIOFOULING
Volume 29, Issue 10, Pages 1225-1232Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08927014.2013.834893
Keywords
magnetite nanoparticles; magnetic hyperthermia; biofilm; planktonic bacteria; Pseudomonas fluorescens
Funding
- European Regional Development Fund (ERDF) under the Northern Regional Operational Programme ON.2-O Novo Norte
- Portuguese Foundation for Science and Technology (FCT) [SFRH/BPD/72632/2010]
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This work evaluated the effect of magnetic hyperthermia (MH) on planktonic cells and biofilms of a major food spoilage bacterium Pseudomonas fluorescens and its performance compared to a conventional direct heating (DH) technique. The results showed that MH had a greater and faster bactericidal effect, promoting a significant reduction in cell viability (3 Log CFU) in planktonic and biofilm cells, and leading to a complete eradication of planktonic cells at 55 degrees C (after only similar to 8min). Accordingly, when comparing the same final temperatures, MH was more harmful to the integrity of cell membranes than DH, as observed in confocal laser scanning microscope images. Additionally, scanning electron microscope images revealed that exposure to MH had promoted modifications of the bacterial cell surface as well as of the structure of the biofilm. These results present the possibility of using MH out of the biomedical field as a potential disinfection method in food-related environments.
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