Synergistic interaction of ultraviolet light and zinc oxide photosensitizer for enhanced microbial inactivation in simulated wash-water

Article

Ercan, D., Cossu, A., Nitin, N. and Tikekar, R. 2016. Synergistic interaction of ultraviolet light and zinc oxide photosensitizer for enhanced microbial inactivation in simulated wash-water. Innovative Food Science and Emerging Technologies. 33, pp. 240-250. https://doi.org/10.1016/j.ifset.2015.11.015
TypeArticle
TitleSynergistic interaction of ultraviolet light and zinc oxide photosensitizer for enhanced microbial inactivation in simulated wash-water
AuthorsErcan, D., Cossu, A., Nitin, N. and Tikekar, R.
Abstract

Synergistic interaction of ultraviolet light (UV-A) and zinc oxide (ZnO) was investigated for enhanced inactivation of Escherichia coli BL21 and T7 bacteriophage in simulated wash-water. In the absence of organic content, UV-A (9.53 J/cm2) and 1 mM ZnO alone caused 3.9 and 0.7 log CFU/mL reductions respectively in logarithmic phase bacteria after 60 min, while a combined treatment caused 6 log CFU/mL reductions. Stationary-phase bacteria were more resistant and a combined treatment caused only 3.5 log CFU/mL reductions. Organic matter in the wash-water lowered the inactivation rates. Nevertheless, approximately 2-log reductions were observed at the highest organic load. T7 bacteriophage was not sensitive to UV-A alone. However, 1 mM photo-irradiated ZnO caused 6.00 log PFU/mL reductions after 60 min. Bacteriophage inactivation was also significantly lowered by organic matter. The reactive oxygen species generated from photo-irradiated ZnO were responsible for the microbial inactivation. UV-A irradiated ZnO is an attractive sanitation approach for fresh-produce washing.

KeywordsFresh produce; Photodynamic inactivation; Zinc oxide; Ultraviolet light ; Cross-contamination; Food safety
PublisherElsevier
JournalInnovative Food Science and Emerging Technologies
ISSN1466-8564
Electronic1878-5522
Publication dates
Online10 Dec 2015
Print01 Feb 2016
Publication process dates
Deposited27 Nov 2019
Accepted20 Nov 2015
Output statusPublished
Digital Object Identifier (DOI)https://doi.org/10.1016/j.ifset.2015.11.015
Scopus EID2-s2.0-84961933300
Web of Science identifierWOS:000372383000029
LanguageEnglish
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