Critical assessment of suitable methods used for determination of antibacterial properties at photocatalytic surfaces

Krýsa, Josef; Musilová, Eva; Zita, Jiří

doi:10.1016/j.jhazmat.2011.08.009

Cited by 19 publications

(9 citation statements)

References 39 publications

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“…Chawengkijwanich and Hayata (2008) reported that increasing UV-A light intensity from 0.05 to 1 mW/cm 2 increased the antimicrobial efficacy of TiO 2 coated polypropylene films from 0.35 to 3 log CFU/cm 2 . Similar results were also reported by Krysa et al (2011) and Dunlop et al (2010). This indicates that the type of binder, the relative proportion of the NP to the binder, and the intensity of UV light all have a significant effect on the bactericidal property of TiO 2 coatings.…”

supporting

confidence: 86%

“…Similarly, Kikuchi et al (1997) reported less than 2 log CFU/cm 2 reduction of E.coli cells after 4 h treatment at 1 mW/cm 2 . Another study by Krysa et al (2011), authors reported that increasing UV-A light intensity from 0.2 to 0.6 mW/cm 2 , decreased the survival of E.coli cells from 77 to 38 % after a 3 h treatment. This can be explained by the fact that UV-A light, with relatively low energy, gradually damages cells through oxidative stress caused by generation of oxygen radicals within the cells (Bock et al, 1998).…”

Section: 2effect Of Light Intensity On the Bactericidal Activity Omentioning

confidence: 94%

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Effect of binder on the physical stability and bactericidal property of titanium dioxide (TiO2) nanocoatings on food contact surfaces

Yemmireddy

Hung

2015

Food Control

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TiO 2 is a promising photocatalyst for use in food processing environment as an antimicrobial coating. The purpose of this study was to determine the effect of different binding agents on the physical stability and bactericidal property of TiO 2 nanocoatings created on stainless steel surfaces. A total of six different coating suspensions were prepared by mixing TiO 2 (Aeroxide ® P-25) nanoparticles (NPs) with three different types of binders (Shellac (A), polyuretahne (B), and polycrylic (C)) at a 1:4 to 1:16 NP to binder weight ratio. Bactericidal activity of these TiO 2 coatings against Escherichia coli O157:H7 (5-strain) was determined at three different UV-A light intensities (0.25, 0.50 and 0.75 mW/cm 2 ) for 3 h. The type of binder used in the coating had a significant effect on the log reduction of E.coli O157:H7. TiO 2 coatings with binder C showed highest reduction (> 4 log CFU/cm 2 ) followed by TiO 2 coating with binder B and A. Increasing the binder concentration in the formulation from a 1:4 to 1:16 weight ratio decreased the log reduction of E.coli O157:H7. Increasing the UV-A light intensity from 0.25 to 0.75 mW/cm 2 increased the log reduction of bacteria for all the TiO 2 coatings. The physical stability of the TiO 2 coatings was determined using ASTM procedures. TiO 2 coatings with binder B showed highest adhesion strength and scratch hardness when compared to coatings with other binders. However, on repeated use experiments (1, 3, 5, and 10 times), TiO 2 coatings with binder C were found to be physically more stable and able to retain their original bactericidal property. The results of this study showed promise in developing durable TiO 2 coatings with strong photocatalytic bactericidal property on food contact surfaces using appropriate binding agents to help ensure safe food processing environment.

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supporting

confidence: 86%

Section: 2effect Of Light Intensity On the Bactericidal Activity Omentioning

confidence: 94%

Effect of binder on the physical stability and bactericidal property of titanium dioxide (TiO2) nanocoatings on food contact surfaces

Yemmireddy

Hung

2015

Food Control

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“…The antibacterial activity was tested following a protocol reported in the literature, with some modifications. TiO 2 thin films were cut into squares of 1 cm × 1 cm, sterilized by being placed in a dry oven at 105 °C overnight, and were successively placed into small (45 mm diameter) sterile petri dishes.…”

Section: Methodsmentioning

confidence: 99%

“…The antibacterial activity of TiO 2 towards both Gram‐positive and Gram‐negative strains has also been reported . Titania has several advantages if used as an antimicrobial agent; indeed TiO 2 is not toxic and, therefore, does not release hazardous compounds into the environment.…”

Section: Introductionmentioning

confidence: 97%

Titanium Dioxide Thin Films Deposited by Electric Field‐Assisted CVD: Effect on Antimicrobial and Photocatalytic Properties^**

Romero

Piccirillo

Castro

et al. 2015

Chemical Vapor Deposition

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Thin films of anatase titanium dioxide are deposited on fluorine-doped tin oxide (FTO) glass substrates utilizing the electric field-assisted aerosol (EA)CVD reaction of titanium isopropoxide in toluene at 450°C. The as-deposited films are characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy (RS), and UV-vis spectroscopy. The photoactivity and antibacterial activity of the films are also assessed. The characterization analysis reveals that the use of an electric field affects the film microstructure, its preferential orientation, and the functional properties. XRD of the anatase films reveals that the application of electric fields causes a change in the preferential orientation of the films from (101) to (004) or (211) planes, depending on the strength of the applied field during the deposition.

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“…Ayrıca, fotokataliz uygulamalarında hedef kirleticinin (antibiyotik, antibiyotiklere dirençli bakteri türü vb.) yüzey yükü özelliklerine uygun yüzeysel morfolojik ve kimyasal özelliklere sahip fotokatalizör kullanımının önemli olduğuna literatür değerlendirmesi sonucunda karar verilmiştir [14][15][16][17][18].…”

Section: Anti̇bi̇yoti̇k Ve Anti̇bi̇yoti̇klere Di̇rençli̇ Bakteri̇leri̇n Fotokatunclassified

Anti̇bi̇yoti̇k Ve Anti̇bi̇yoti̇klere Di̇rençli̇ Bakteri̇leri̇n Fotokatali̇z Prosesi̇ İle Gi̇deri̇mi̇ni̇n Değerlendi̇ri̇lmesi̇

Özkal¹,

Pagano²

2016

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZSu kaynaklarında sıklıkla rastlanan mikrokirleticilerin, alıcı ortamdaki çevresel etkileri ve mevcut arıtma sistemleri ile etkin giderilememeleri sebebiyle gelecek yıllarda yasal sınırlamaların hedefi olması beklenmektedir. Özellikle farmasötikler ve geniş kullanım alanına sahip antibiyotikler, hem üretimleri, hem de tüketimleri sonrasında çevreye salınmakta ve alıcı ortamı tehdit etmektedir. Biyolojik arıtma sistemleri başta olmak üzere konvansiyonel arıtma proseslerinin, antibiyotiklerin gideriminde yetersiz kaldığı görülmektedir. Antibiyotiklerin biyolojik olarak bozunmaya dirençli yapısı oksidasyon potansiyeli yüksek olan ileri oksidasyon proseslerinin kullanımını gerektirmektedir. Fotokataliz prosesleri, eko-toksik etkisinin minimum düzeyde olması ve antibiyotikleri mineralize edebilme potansiyeli ile önemli bir detoksifikasyon prosesidir. Ayrıca prosesin güneş enerjisi ile işletilebilir olması, deneysel çalışma ve pilot ölçekli uygulamalara olan ilgiyi arttırmaktadır. Bu çalışma ile literatürde askıda sistem ve yüzeyde sabitlenme prensibine göre yürütülmekte olan fotokataliz prosesi çalışmalarının temel prensip ve mekanizmaları, antibiyotik giderimi ve bakteri inaktivasyonu açısından değerlendirilmektedir. Proses parametrelerinin, büyük ölçekli uygulamaların yaygınlaşması ve prosesin modellenmesi hedeflerine uygun olarak ele alınması üzerinde durulmuştur. Anahtar Kelimeler: Antibiyotik giderimi, bakteri inaktivasyonu, fotokataliz EVALUATION OF ANTIBIOTICS AND ANTIBIOTIC RESISTANT BACTERIA REMOVAL BY PHOTO-CATALYSIS ABSTRACTMicro-pollutants are one of the most commonly encountered pollutants in water resources. Because of environmental impacts and insufficient rates of removal at the prevalent treatment plant, they involve the most specific pollutants that will be the target of future legislations. Following their production and consumption, releases of effluents pose a threat to the receiving environment. Conventional but most essentially of biological treatment plants, are mostly ineffective for removal of antibiotics. Advanced oxidation processes with their high oxidation potentials have the utmost potential for total mineralization of antibiotics that have non-biodegradable structure. Photo-catalysis is superior with its process mechanism causing relatively lower eco-toxicity and able to provide total mineralization and may be nominated as a detoxification process option. Since photo-catalysis has potential to be operated under solar irradiation, there is growing interest in both laboratory scale experiments and pilot scale applications.

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Critical assessment of suitable methods used for determination of antibacterial properties at photocatalytic surfaces

Cited by 19 publications

References 39 publications

Effect of binder on the physical stability and bactericidal property of titanium dioxide (TiO2) nanocoatings on food contact surfaces

Effect of binder on the physical stability and bactericidal property of titanium dioxide (TiO2) nanocoatings on food contact surfaces

Titanium Dioxide Thin Films Deposited by Electric Field‐Assisted CVD: Effect on Antimicrobial and Photocatalytic Properties^**

Anti̇bi̇yoti̇k Ve Anti̇bi̇yoti̇klere Di̇rençli̇ Bakteri̇leri̇n Fotokatali̇z Prosesi̇ İle Gi̇deri̇mi̇ni̇n Değerlendi̇ri̇lmesi̇

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Critical assessment of suitable methods used for determination of antibacterial properties at photocatalytic surfaces

Cited by 19 publications

References 39 publications

Effect of binder on the physical stability and bactericidal property of titanium dioxide (TiO2) nanocoatings on food contact surfaces

Effect of binder on the physical stability and bactericidal property of titanium dioxide (TiO2) nanocoatings on food contact surfaces

Titanium Dioxide Thin Films Deposited by Electric Field‐Assisted CVD: Effect on Antimicrobial and Photocatalytic Properties**

Anti̇bi̇yoti̇k Ve Anti̇bi̇yoti̇klere Di̇rençli̇ Bakteri̇leri̇n Fotokatali̇z Prosesi̇ İle Gi̇deri̇mi̇ni̇n Değerlendi̇ri̇lmesi̇

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Resources

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Titanium Dioxide Thin Films Deposited by Electric Field‐Assisted CVD: Effect on Antimicrobial and Photocatalytic Properties^**