Efficacy of UV-TiO 2 photocatalysis technology for inactivation of Escherichia coli K12 on the surface of blueberries and a model agar matrix and the influence of surface characteristics.

Autor: Lee M; Department of Biotechnology, Yonsei University, Seoul 03722, South Korea., Shahbaz HM; Department of Food Science and Human Nutrition, University of Veterinary and Animal Sciences, Lahore 54000, Pakistan., Kim JU; Department of Biotechnology, Yonsei University, Seoul 03722, South Korea., Lee H; Department of Biotechnology, Yonsei University, Seoul 03722, South Korea., Lee DU; Department of Food Science and Technology, Chung-Ang University, Anseong 17546, South Korea., Park J; Department of Biotechnology, Yonsei University, Seoul 03722, South Korea. Electronic address: foodpro@yonsei.ac.kr.
Jazyk: angličtina
Zdroj: Food microbiology [Food Microbiol] 2018 Dec; Vol. 76, pp. 526-532. Date of Electronic Publication: 2018 Jul 30.
DOI: 10.1016/j.fm.2018.07.015
Abstrakt: Surface disinfection of fresh blueberries is an important food safety challenge due to the delicate texture and short shelf life of these small fruits. A newly designed water-assisted photocatalytic reactor was developed for disinfection of fruits with a delicate texture and complex surface characteristics. Efficacy of UV-TiO 2 photocatalysis was evaluated in comparison with UV alone for inactivation of Escherichia coli K12 (as a surrogate for Escherichia coli O157:H7) inoculated onto the surface of the blueberry skin, calyx, and an experimentally prepared agar matrix that was used as a model matrix. Influence of surface characteristics such as surface hydrophobicity and surface free energy on bacterial adhesion were also investigated. The initial bacterial population on all surfaces was approximately 7.0 log CFU/g. UV-TiO 2 photocatalysis (4.5 mW/cm 2 ) for 30 s achieved comparatively higher bacterial reductions of 5.3 log and 4.6 log CFU/g on blueberry skin and agar matrix surfaces, respectively, than 4.5 log and 3.4 log CFU/g reductions for UV alone (6.0 mW/cm 2 ). Total phenolic and total anthocyanin contents of fruits were significantly increased after both UV-TiO 2 and UV treatments, compared with water washed control fruits. UV-TiO 2 photocatalysis technology is a non-chemical and residue-free method with reduced water usage for surface disinfection of fresh blueberries.
(Copyright © 2018 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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