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7 October 2014Characterization of plasma treated surfaces for food safety by terahertz spectroscopy
A physico-chemical approach to modify surfaces not only for use in medicine, but also for preservation of food is
nowadays widely studied to lower the risks of increased number of bacterial pathogens that are in a direct contact with
people. Food safety is very important part of preserving sustainability during crises, especially after the
enterohaemorrhagic Escherichia coli outbreak in Europe in 2011. One of the possibility how we can protect food against
various pathogens is the modification of packing materials that are directly in contact with preserved food. This
contribution deals with the characterization of modified surfaces with antibacterial properties via Terahertz spectroscopy.
For the purpose of this paper, three monomers were used for grafting onto air radiofrequency plasma activated low
density polyethylene surface, which created a brush-like structure. Next, the antibacterial agents, Irgasan and
Chlorhexidine, were anchored to these surfaces. These antibacterial agents were selected for supposed effect on two most
frequently occurring bacterial strains - Escherichia coli and Staphylococcus aureus. Materials were further tested for the
presence of antibacterial agent molecules, in our case by means of terahertz spectroscopy. Each material was tested on
two spectroscopes - the SPECTRA and the OSCAT terahertz instruments.
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Kateřina Sulovská, Marián Lehocký, "Characterization of plasma treated surfaces for food safety by terahertz spectroscopy," Proc. SPIE 9252, Millimetre Wave and Terahertz Sensors and Technology VII, 925209 (7 October 2014); https://doi.org/10.1117/12.2067162