Dynamics of E. coli membrane cell peroxidation during TiO2 photocatalysis studied by ATR-FTIR spectroscopy and AFM microscopy

Надточенко, В. А.; Rincon, A. G.; Stanca, Sarmiza Elena; Kiwi, J.

doi:10.1016/j.jphotochem.2004.06.011

Cited by 217 publications

(138 citation statements)

References 15 publications

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“…The adsorption of Cu-NPs on MRSA cell wall has been reported to happen preferentially on the teichoic acid and the peptidoglycan components [62]. For E. coli and MRSA, the bacterial desinfection has been reported to occur on several metals/metal oxides [63][64][65].…”

Section: Cu Coupled With Tio 2 Sputtered Surfaces Active In the Visibmentioning

confidence: 99%

Indoor Light Enhanced Photocatalytic Ultra-Thin Films on Flexible Non-Heat Resistant Substrates Reducing Bacterial Infection Risks

Rtimi

2017

Catalysts

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Photocatalytic antibacterial sol-gel coated substrates have been reported to kill bacteria under light or in the dark. These coatings showed non-uniform distribution, poor adhesion to the substrate and short effective lifetime as antibacterial surfaces. These serious limitations to the performance/stability retard the potential application of antibacterial films on a wide range of surfaces in hospital facilities and public places. Here, the preparation, testing and performance of flexible ultra-thin films prepared by direct current magnetron sputtering (DCMS) at different energies are reviewed. This review reports the recent advancements in the preparation of highly adhesive photocatalytic coatings prepared by up to date sputtering technology: High Power Impulse Magnetron Sputtering (HIPIMS). These latter films demonstrated an accelerated antibacterial capability compared to thicker films prepared by DCMS leading to materials saving. Nanoparticulates of Ti and Cu have been shown during the last decades to possess high oxidative redox potentials leading to bacterial inactivation kinetics in the minute range. In the case of TiO 2 -CuO x films, the kinetics of abatement of Escherichia coli (E. coli) and methicillin resistant Staphylococcus aureus (MRSA) were enhanced under indoor visible light and were perceived to occur within few minutes. Oligodynamic effect was seen to be responsible for bacterial inactivation by the small amount of released material in the dark and/or under light as detected by inductively-coupled plasma mass spectrometry (ICP-MS). The spectral absorbance (detected by Diffuse Reflectance Spectroscopy (DRS)) was also seen to slightly shift to the visible region based on the preparation method.

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Section: Cu Coupled With Tio 2 Sputtered Surfaces Active In the Visibmentioning

confidence: 99%

Indoor Light Enhanced Photocatalytic Ultra-Thin Films on Flexible Non-Heat Resistant Substrates Reducing Bacterial Infection Risks

Rtimi

2017

Catalysts

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“…On E. coli cells, various degrees of cell disruption including plasmolysis, intracellular vacuoles ghost and cell debris was observed; in particular, the outer membrane is the first to be attacked, followed by the complete degradation of the cytoplasmic membrane. Spectroscopic studies X-ray diffraction (144), laser kinetic spectroscopy and attenuated total reflection Fourier Transform Infrared Spectroscopy (FTIR) (134,(145)(146)(147) were used to show cell disruption due to lipid peroxidation or direct oxidation. Lipid peroxidation occurs when polyunsaturated fatty acids (linoleic acid) are attacked by ROS such as hydroxyl radicals and H 2 O 2 produced by irradiated TiO 2 surfaces.…”

Section: In Vitro Evaluation Of Tio 2 Antibacte-rial Activitymentioning

confidence: 99%

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

et al. 2011

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Int J Artif Organs ( 2011; : 9) 929-946 34 TITANIUM OXIDE AND ANTIBACTERIAL SURFACES IN BIOMEDICAL DEVICES Device-related infections: a clinical demand driving material science researchAn increasing number of clinical procedures requires the use of biomedical devices, whose widespread presence in modern therapeutic treatments is driving the demand for better performances and longer reliability. One of the major issues of both short-term devices and implantable prostheses is represented by device-related infections (DRIs) Accepted: August 31, 2011 rEViEW due to bacterial colonization and proliferation (1). About half of the 2 million cases of nosocomial infections that occur each year in the United States are associated with indwelling devices (2): these infections generally require a longer period of antibiotic therapy and repeated surgical procedures, resulting in potential risks for the patient and increased costs for the healthcare system. The planktonic bacteria that colonize a device surface tend to form a biofilm and the sessile bacterial cells, enclosed in a self-produced polymeric matrix of this kind, can withstand host immune responses and generally show extraordinary antibiotic resistance (3). Eventually, bacteria rapid multiply and disperse in planktonic form, giving rise

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“…The samples of Escherichia coli (E. coli K12) was obtained from the Deutsche Sammlung von Mikro-organismen und Zellkulturen GmbH (DSMZ) ATCC23716, Braunschweig, Germany to test the loss of bacterial viability on the Ag-polyester as previously reported by our laboratory [21,28,37]. The bacterial data reported were replicated three times.…”

Section: Evaluation Of the Loss Of Bacterialmentioning

confidence: 99%

“…Recently, we have reported the mechanism of the damage induced by TiO 2 photocatalysis on the bilayer cell-envelope of Escherichia coli in several studies [20][21][22][23]. Other groups working in the disinfection field have also addressed the mechanism of disinfection [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

Rtimi

Pascu

Sanjinés

et al. 2013

Applied Catalysis B: Environmental

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a b s t r a c tThis study reports visible light sensitive ZrNO and ZrNO-Ag polyester samples prepared by sputtering in an Ar/N 2 /O 2 atmosphere leading to Escherichia coli bacterial inactivation. The bacterial inactivation by ZrNO avoids the increasing environmental concern involving the fate of Ag-leaching of many disinfectants. The simultaneous co-sputtering of ZrNO and Ag 2 O enhanced the E. coli bacterial inactivation kinetics compared to the sequential sputtering of ZrNO and Ag. A reaction mechanism is suggested triggered by photoinduced interfacial charge transfer (IFCT) suggesting electron injection form the Ag 2 O cb to the ZrO 2cb . The sizes of the ZrO 2 and Ag nanoparticles in the co-sputtered ZrNO-Ag were 80-130 nm and 8-15 nm respectively as determined by high angular annular dark field (HAADF) microscopy. Evidence is presented by X-ray photoelectron spectroscopy (XPS) for the self-cleaning of the photocatalysts after bacterial inactivation. This enabled a stable catalyst reuse. The XPS experimental spectra of ZrNO and ZrNO-Ag were deconvoluted into their ZrN, ZrNO and ZrO 2 components. The amounts of Ag-ions released during bacterial inactivation were < 5 ppb/cm 2 and well below the Ag cytotoxic levels. Since no cytotoxicity was introduced during the bacterial inactivation process, the ZrNO-Ag disinfection proceeds through an oligodynamic effect.

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Dynamics of E. coli membrane cell peroxidation during TiO2 photocatalysis studied by ATR-FTIR spectroscopy and AFM microscopy

Cited by 217 publications

References 15 publications

Indoor Light Enhanced Photocatalytic Ultra-Thin Films on Flexible Non-Heat Resistant Substrates Reducing Bacterial Infection Risks

Indoor Light Enhanced Photocatalytic Ultra-Thin Films on Flexible Non-Heat Resistant Substrates Reducing Bacterial Infection Risks

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

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