Inactivation of pathogenic bacteria inoculated onto a Bacto<sup>™</sup>agar model surface using TiO<sub>2</sub>-UVC photocatalysis, UVC and chlorine treatments

Yoo, Sungjun; Ghafoor, Kashif; Kim, S.; Sun, Ya-Ping; Kim, J. U.; Yang, Keli; Lee, D. U.; Shahbaz, Hafiz Muhammad; Park, Jiyong

doi:10.1111/jam.12877

Cited by 22 publications

(8 citation statements)

References 31 publications

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“…These reductions were found to be much higher than the reductions achieved by NaOCl, and UV treatments alone. Similarly, Yoo and others () reported a 4.5 to 6 log CFU/cm 2 reduction of E.coli K12, S. typhimurium , S. aureus , and L. monocytogenes from an artificial food surface model using a TiO 2 –UVC photoreactor. This treatment was shown to have potential to disinfect fruit, vegetable, and other similar food product surfaces.…”

Section: Semiconductor Metal Oxide Surface Coatingsmentioning

confidence: 74%

Using Photocatalyst Metal Oxides as Antimicrobial Surface Coatings to Ensure Food Safety—Opportunities and Challenges

Yemmireddy

Hung

2017

Comp Rev Food Sci Food Safe

138

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Cross-contamination of foods with pathogenic microorganisms such as bacteria, viruses, and parasites may occur at any point in the farm to fork continuum. Food contact and nonfood contact surfaces are the most frequent source of microbial cross-contamination. In the wake of new and emerging food safety challenges, including antibioticresistant human pathogens, conventional sanitation and disinfection practices may not be sufficient to ensure safe food processing, proper preparation, and also not be environmentally friendly. Nanotechnology-enabled novel food safety interventions have a great potential to mitigate the risk of microbial cross-contamination in the food chain. Especially engineered nanoparticles (ENPs) are increasingly finding novel applications as antimicrobial agents. Among various ENPs, photocatalyst metal oxides have shown great promise as effective nontargeted disinfectants over a wide range of microorganisms. The present review provides an overview of antimicrobial properties of various photocatalyst metal oxides and their potential applications as surface coatings. Further, this review discusses the most common approaches to developing antimicrobial coatings, methods to characterize, test, and evaluate antimicrobial efficacy as well as the physical stability of the coatings. Finally, regulations and challenges concerning the use of these novel photocatalytic antimicrobial coatings are also discussed.

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Section: Semiconductor Metal Oxide Surface Coatingsmentioning

confidence: 74%

Using Photocatalyst Metal Oxides as Antimicrobial Surface Coatings to Ensure Food Safety—Opportunities and Challenges

Yemmireddy

Hung

2017

Comp Rev Food Sci Food Safe

138

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“…This precedence order is confirmed in the literature, being attributed to Gram-positive species possessing a thick cell wall with many layers of peptidoglycan and teichoic acids, which potentially preserves the bacterial viability during disinfection. 36 Nevertheless, this is not always the case, as the outer membrane of Gram-negative bacteria counteracts the lack of a thick wall, resulting in requirement of high catalyst concentrations up to 300 mg L −1 for complete elimination. 37…”

Section: Bacterial Inactivationmentioning

confidence: 99%

N‐doped TiO₂ photocatalysts for bacterial inactivation in water

Makropoulou

Panagiotopoulou

Venieri

2018

J of Chemical Tech & Biotech

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BACKGROUND The elimination of diverse and pathogenic microbial loads in water imposes the exploration of effective disinfection techniques. The current study focused on the synthesis of N‐TiO2 photocatalysts and the investigation of their disinfection potential, in terms of Escherichia coli, Pseudomonas aeruginosa and Bacillus cereus inactivation in aqueous samples under artificial sunlight. RESULTS N‐TiO2 photocatalysts were synthesized using various nitrogen precursors [urea, triethylamine‐(TEA) and NH3], exhibiting narrow band gaps and improved visible light response. The relative bactericidal activity of the catalysts followed the order N‐TiO2 (UREA) > N‐TiO2 (NH3)∼N‐TiO2 (TEA) > synthesized TiO2 > TiO2‐P25. The Gram‐negative indicators E. coli and P. aeruginosa, were readily inactivated, reaching reduction rates up to 6 log10 within 60 min of treatment at an initial bacterial concentration of 106 CFU mL−1 and a catalyst concentration of 50 mg L−1. The activity discrepancies among the catalysts were more pronounced in the case of B. cereus, which showed higher resistance, thus exhibiting slower inactivation rates. Complete elimination was achieved only with N‐TiO2 (TEA) within 60 min of irradiation at a loading of 100 mg L−1. Increasing the TEA concentration for the preparation of this catalyst from 25 to 89 v/v% did not enhance significantly the process. Operating conditions, including catalyst concentration, nitrogen precursor and, especially, bacterial species defined the disinfection efficiency up to a certain extent. CONCLUSION Solar photocatalysis with N‐TiO2 catalysts may be an effective disinfection technology if the operational conditions are established in relation to the microbial content in water, which includes opportunistic pathogens such as P. aeruginosa and B. cereus. © 2018 Society of Chemical Industry

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“…Recently, researchers evaluated the effect of TUV treatment on pathogenic microorganisms including E. coli K12, S. Typhimurium, S. aureus, and L. monocytogenes inoculated on the surface of Bacto TM agar model (Yoo et al, 2015b). TUV treatment reduced the microbial load by 4.5-6.0 log CFU/cm 2 whereas UV alone treatment led to a 3.0-5.3 log CFU/cm 2 reduction.…”

Section: Surface Disinfection Of Model Foodsmentioning

confidence: 99%

“…Altering the technique by addition of TiO 2 may greatly influence consumer acceptance (Cho et al, 2007;Kim et al, 2009;Yoo et al, 2015a). In most research work on food products, TiO 2 is immobilized by coating the quartz tube or the sample holder (Cho et al, 2007;Kim et al, 2009;Chai et al, 2014;Yoo et al, 2015b). Although TiO 2 is immobilized, it has to be confirmed that there are minimal residues in the treated food products (Cho et al, 2007;Kim et al, 2009;Yoo et al, 2015a).…”

Section: F) Need For Consumer Awareness and Acceptancementioning

confidence: 99%

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Application of ultraviolet light assisted titanium dioxide photocatalysis for food safety: A review

Ramesh

Nayak

Amirbahman

et al. 2016

Innovative Food Science & Emerging Technologies

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UV-assisted TiO 2 photocatalysis (TUV) is an emerging non-thermal technology that has shown to efficiently inactivate food-borne pathogens. While TUV processing has been a wellestablished technique for water and wastewater treatment, its application in the food industry is minimal. The basic working principle underlying TUV technology is the photocatalytic production of reactive oxygen species (ROS) that carry out redox reactions with species adsorbed on the TiO 2 surface. Studies have confirmed that severe cell damage including destruction of the cytoplasmic membrane, super-coiled plasmid DNA and genomic DNA, and internal organelles occurred when bacteria were exposed to TUV. Recently, TUV has been explored for its applications in surface disinfection and post-harvest disease control of fresh produce, pasteurization of beverages, and anti-microbial food packaging. Although the novel developments in the technology are promising, more research is needed to achieve the practical application of this technology. The intent of this article is to provide an overview of the principles of TUV, the mechanism of microbial inactivation by TUV, and the recent findings on utilization of TUV for microbiological safety of foods and also, to present the prospective opportunities for TUV in the food industry.

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Inactivation of pathogenic bacteria inoculated onto a Bacto^™agar model surface using TiO₂-UVC photocatalysis, UVC and chlorine treatments

Abstract: The results showing effects of photocatalysis and other treatments for inactivation of bacterial pathogens on model surface can be useful for applying such processes for disinfection of fruit, vegetables and other similar surfaces.

Cited by 22 publications

References 31 publications

Using Photocatalyst Metal Oxides as Antimicrobial Surface Coatings to Ensure Food Safety—Opportunities and Challenges

Using Photocatalyst Metal Oxides as Antimicrobial Surface Coatings to Ensure Food Safety—Opportunities and Challenges

N‐doped TiO₂ photocatalysts for bacterial inactivation in water

Application of ultraviolet light assisted titanium dioxide photocatalysis for food safety: A review

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Inactivation of pathogenic bacteria inoculated onto a Bacto™agar model surface using TiO2-UVC photocatalysis, UVC and chlorine treatments

Abstract: The results showing effects of photocatalysis and other treatments for inactivation of bacterial pathogens on model surface can be useful for applying such processes for disinfection of fruit, vegetables and other similar surfaces.

Cited by 22 publications

References 31 publications

Using Photocatalyst Metal Oxides as Antimicrobial Surface Coatings to Ensure Food Safety—Opportunities and Challenges

Using Photocatalyst Metal Oxides as Antimicrobial Surface Coatings to Ensure Food Safety—Opportunities and Challenges

N‐doped TiO2 photocatalysts for bacterial inactivation in water

Application of ultraviolet light assisted titanium dioxide photocatalysis for food safety: A review

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Product

Resources

About

Inactivation of pathogenic bacteria inoculated onto a Bacto^™agar model surface using TiO₂-UVC photocatalysis, UVC and chlorine treatments

N‐doped TiO₂ photocatalysts for bacterial inactivation in water