Mode of photocatalytic bactericidal action of powdered semiconductor TiO2 on mutans streptococci

Saito, Takeshi; Iwase, Tatsuo; Horie, Junji; Morioka, Toshio

doi:10.1016/1011-1344(92)85115-b

Cited by 412 publications

(219 citation statements)

References 20 publications

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“…4 It was reported that the photocatalytic effect can be enhanced by preventing the recombination of electrons and holes through the addition of a noble metal. 6,9 A similar mechanism might also apply in the case of Ag.…”

Section: Discussionmentioning

confidence: 94%

“…It was reported that the antibacterial effect of TiO 2 is based on the disorder of the cytoplasmic membrane. 1,6,17 The photocatalytic ability is lost if the electronic hole pairs of TiO 2 recombine before they can be used for photocatalysis. The high levels of antibacterial efficiency of TiAg compared with that of Ti may be explained by the role of Ag in preventing the recombination of electrons and holes, which in turn, facilitates disruption of the cell wall.…”

Section: Discussionmentioning

confidence: 99%

“…2,3 Hydroxyl radicals that are extremely reactive to organic compounds are produced by the irradiation of TiO 2 at wavelengths Ͼ385 nm, resulting in photocatalytic antibacterial activity. 4,5 TiO 2 was reported to have antibacterial activity against two major bacteria in the dental field-Lactobacillus acidophilus 5 and Streptococcus mutans (s mutans) 6 -indicating its possible clinical applications.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Antibacterial Effect of TiO2 Film of TiAg on Streptococcus mutans

Choi

Chung

Oh³

et al. 2009

The Angle Orthodontist

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Objective: To test through various oxidation procedures the differences in antibacterial activities against Streptococcus mutans (S mutans) of Titanium (Ti) and Titanium silver (TiAg) metals coated with TiO 2 . Materials and Methods: This study examined the photocatalytic antibacterial effects on S mutans of Ti and TiAg ubstrates coated with two crystalline forms of TiO 2 by thermal and anodic oxidation. A bacterial suspension of S mutans was pipetted onto TiO 2 -coated metal specimens and uncoated specimens with ultraviolet A (UVA) illumination for 20 to 100 minutes. The same specimen without UVA was used as the control. The level of colony-forming units of S mutans after UVA illumination was compared with that of the control. Results: The level of colony-forming units of S mutans was significantly lower on TiO 2 -coated Ti and TiAg metal specimens after UVA illumination than on uncoated Ti and TiAg specimens. The level of colony-forming units of S mutans was significantly lower on the metals coated by anodic oxidation than on those coated by thermal oxidation. The TiO 2 coating on TiAg had a significantly higher and more rapid antibacterial effect than did the TiO 2 coating on Ti. Conclusions:The antibacterial effect of a TiO 2 film formed by anodic oxidation was superior to that formed by thermal oxidation. The addition of Ag to the Ti specimen indicated a synergistic effect on the photocatalytic antibacterial property against S mutans. (Angle Orthod. 2009;79: 528-532.)

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Antibacterial Effect of TiO2 Film of TiAg on Streptococcus mutans

Choi

Chung

Oh³

et al. 2009

The Angle Orthodontist

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“…Various studies performed on Streptococcus sobrinus, E. coli and S. aureus with TiO 2 showed leakage of potassium ions from the bacteria and the parallel decrease in cell viability (70,72,(132)(133)(134)(135).…”

Section: Evaluation Of Changes In Membrane Permeabilitymentioning

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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“…Based on the TEM investigation, the cell wall, the peptidoglycan layer, and the cell membrane of the bacteria were decomposed by reactive species. K + exists universally in bacteria (24) and plays a role in the regulation of polysome content and protein synthesis. Therefore, K + leakage from the inactivated bacteria was used in this work to examine the permeability of the cell membrane ( Figure S5, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Efficient Destruction of Pathogenic Bacteria with NiO/SrBi₂O₄ under Visible Light Irradiation

Guo

et al. 2006

Environ. Sci. Technol.

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The photocatalytic inactivation of pathogenic bacteria in water was investigated systematically with NiO/SrBi 2 O 4 under visible light (λ>420 nm) irradiation. The catalyst was found to be highly effective in killing Escherichia coli, a Gramnegative bacterium, and Staphylococcus aureus, a Grampositive bacterium. ESR studies revealed that • OH and O 2 •-were involved as the active species in the photocatalytic reaction. The decomposition process of the cell wall and the cell membrane was directly observed by TEM and further confirmed by the determination of potassium ion (K + ) leakage from the killed bacteria. A possible cell damage mechanism by visible-light-driven NiO/SrBi 2 O 4 is proposed. In addition, the effects of pH, methanol, and inorganic ions on bacterial photocatalytic inactivation were investigated. These results indicated that the electrostatic force interaction of bacteria-catalyst is crucial for high bactericidal efficiency.

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Mode of photocatalytic bactericidal action of powdered semiconductor TiO2 on mutans streptococci

Cited by 412 publications

References 20 publications

Photocatalytic Antibacterial Effect of TiO2 Film of TiAg on Streptococcus mutans

Photocatalytic Antibacterial Effect of TiO2 Film of TiAg on Streptococcus mutans

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

Efficient Destruction of Pathogenic Bacteria with NiO/SrBi₂O₄ under Visible Light Irradiation

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Mode of photocatalytic bactericidal action of powdered semiconductor TiO2 on mutans streptococci

Cited by 412 publications

References 20 publications

Photocatalytic Antibacterial Effect of TiO2 Film of TiAg on Streptococcus mutans

Photocatalytic Antibacterial Effect of TiO2 Film of TiAg on Streptococcus mutans

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

Efficient Destruction of Pathogenic Bacteria with NiO/SrBi2O4 under Visible Light Irradiation

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Product

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Efficient Destruction of Pathogenic Bacteria with NiO/SrBi₂O₄ under Visible Light Irradiation