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

Ercan, Duygu, Cossu, Andrea ORCID: https://orcid.org/0000-0003-4086-8640, Nitin, Nitin and Tikekar, Rohan V. (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. ISSN 1466-8564 [Article] (doi:10.1016/j.ifset.2015.11.015)

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.

Item Type: Article
Research Areas: A. > School of Science and Technology > Natural Sciences
Item ID: 27321
Useful Links:
Depositing User: Andrea Cossu
Date Deposited: 27 Nov 2019 11:49
Last Modified: 27 Nov 2019 11:50
URI: https://eprints.mdx.ac.uk/id/eprint/27321

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