Abstract
The influence of accelerated UV-A and Q-SUN irradiation on the antimicrobial properties of coatings containing ZnO nanoparticles was investigated using a polyethylene (PE) film covering. The results of the study showed that Methyl Hydroxypropyl Celluloses (MHPC) coatings did not influence the growth of S. aureus, B. cereus, E. coli, P. aeruginosa or C. albicans cells. MHPC coatings containing ZnO nanoparticles inhibited the growth of bacterial strains and reduced the number of C. albicans strains. Accelerated Q-SUN and UV-A irradiation had no influence on the antimicrobial effect of nano ZnO coatings against S. aureus, B. cereus and E. coli. Q-SUN irradiation decreased the activity of MHPC coatings containing nanoparticles against P. aeruginosa and C. albicans. An FT-IR analysis clearly showed that ZnO nanoparticles shielded the MHPC coating during Q-SUN irradiation.
Highlights
IntroductionThe use of active antimicrobial compounds incorporated in packaging material has begun to receive more attention, for its use as control agents against bacteria in food packaging systems
The use of active antimicrobial compounds incorporated in packaging material has begun to receive more attention, for its use as control agents against bacteria in food packaging systems.It can ensure microbial food safety for the consumer, and be invaluable for the extension of product shelf life [1,2,3]
The results of the study showed that Methyl Hydroxypropyl Celluloses (MHPC) coatings did not have an influence on the growth of S. aureus cells, as was indicated by a previous study [2]
Summary
The use of active antimicrobial compounds incorporated in packaging material has begun to receive more attention, for its use as control agents against bacteria in food packaging systems. It can ensure microbial food safety for the consumer, and be invaluable for the extension of product shelf life [1,2,3]. Nanoparticles have been explored as antimicrobial agents, used in active food packaging systems, as one of five various zinc compounds that are regarded as being safe (GRAS) by the United States food and drug administration (USFDA, 21CFR182.8991) [1,2,5]. All active coatings reduced the number of yeasts and moulds in sliced bread for 15 days, and offered a further improvement in antimicrobial properties obtained for active coatings, with no fungal growth over
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