The Antibacterial Effects of Biphasic Brookite-Anatase Titanium Dioxide Nanoparticles on Multiple-Drug-Resistant &lt;I&gt;Staphylococcus aureus&lt;/I&gt;

Shah, Rupal R.; Kaewgun, Sujaree; Lee, Burtrand I.; Tzeng, Tzuen‐Rong

doi:10.1166/jbn.2008.324

Cited by 30 publications

(18 citation statements)

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“…The redox activity of the S 8 -ring may form the basis for a widespread, yet selective biological activity, which includes toxicity against various bacteria, redox sensitive plasmodia and certain nematodes. Within this context, sulfur nanoparticles join the fold of other toxic nanoparticles, whose toxicity seems to be connected to their size, including silver nanoparticles, 23-25 titanium dioxide nanoparticles 26 and lanthanum calcium manganate nanoparticles. 27 Since nanosulfur particles do not appear to be particularly toxic against human cells, they may provide the basis for the development of future antimicrobial formulations in Medicine and Agriculture.…”

Section: Discussionmentioning

confidence: 99%

Selective Antimicrobial Activity Associated with Sulfur Nanoparticles

Schneider

Baldauf²,

Ba³

et al. 2011

j biomed nanotechnol

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Many sulfur compounds are known to exhibit widespread antimicrobial activity. The latter is often the result of an intricate redox biochemistry whereby reactive sulfur species, such as organic polysulfanes, interact with pivotal cellular signaling pathways. The S 8 unit in elemental sulfur resembles certain aspects of the chemistry of polysulfanes. As a consequence, water-soluble S 8 -sulfur nanoparticles are active against some smaller organisms, including nematodes, yet are non-toxic against human cells. In contrast, selenium and tellurium nanoparticles are less active. Together, the ease of production of the sulfur nanoparticles, their chemical stability in aqueous dispersion, amenable physical properties and selective toxicity, turn sulfur nanoparticles into promising antimicrobial prototypes for medical as well as agricultural applications.

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Section: Discussionmentioning

confidence: 99%

Selective Antimicrobial Activity Associated with Sulfur Nanoparticles

Schneider

Baldauf²,

Ba³

et al. 2011

j biomed nanotechnol

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“…The increased activity is generally ascribed to interactions between the two forms, reducing bulk recombination. Brookite has been relatively little studied, but a recent paper showed that a brookite-anatase mixture was more active than anatase alone (Shah et al 2008). A silverdoped multiphase catalyst was shown to have increased photocatalytic activity, but its antimicrobial activity was not reported (Yu et al 2005a).…”

Section: Photocatalytic Mechanismmentioning

confidence: 99%

Photocatalytic disinfection using titanium dioxide: spectrum and mechanism of antimicrobial activity

Foster

Ditta

Varghese

et al. 2011

Appl Microbiol Biotechnol

975

669

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The photocatalytic properties of titanium dioxide are well known and have many applications including the removal of organic contaminants and production of self-cleaning glass. There is an increasing interest in the application of the photocatalytic properties of TiO(2) for disinfection of surfaces, air and water. Reviews of the applications of photocatalysis in disinfection (Gamage and Zhang 2010; Chong et al., Wat Res 44(10):2997-3027, 2010) and of modelling of TiO(2) action have recently been published (Dalrymple et al. , Appl Catal B 98(1-2):27-38, 2010). In this review, we give an overview of the effects of photoactivated TiO(2) on microorganisms. The activity has been shown to be capable of killing a wide range of Gram-negative and Gram-positive bacteria, filamentous and unicellular fungi, algae, protozoa, mammalian viruses and bacteriophage. Resting stages, particularly bacterial endospores, fungal spores and protozoan cysts, are generally more resistant than the vegetative forms, possibly due to the increased cell wall thickness. The killing mechanism involves degradation of the cell wall and cytoplasmic membrane due to the production of reactive oxygen species such as hydroxyl radicals and hydrogen peroxide. This initially leads to leakage of cellular contents then cell lysis and may be followed by complete mineralisation of the organism. Killing is most efficient when there is close contact between the organisms and the TiO(2) catalyst. The killing activity is enhanced by the presence of other antimicrobial agents such as Cu and Ag.

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“…The reason for this higher activity should be attributed to the combined effect of the higher surface adsorptive capacity of anatase and its higher rate of hole trapping. Recently, studies have shown that mixtures of anataserutile or brookite-anatase were more active than anatase alone (33,34).…”

Section: Visai Et Almentioning

confidence: 99%

“…Trasmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) images of TiO 2 -treated bacterial cells such as S. mutans (132), Pseudomonas aeruginosa (136), E. coli (47,(137)(138)(139)(140)(141)(142), S. aureus (143), MRSA and methicillin-sensitive S. aureus (137), and Streptococcus pneumonia (143) were used to show membrane damage and progressive destructions of cells if compared to untreated cells (72).…”

Section: Microscopy Observationsmentioning

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 Antibacterial Effects of Biphasic Brookite-Anatase Titanium Dioxide Nanoparticles on Multiple-Drug-Resistant <I>Staphylococcus aureus</I>

Cited by 30 publications

References 0 publications

Selective Antimicrobial Activity Associated with Sulfur Nanoparticles

Selective Antimicrobial Activity Associated with Sulfur Nanoparticles

Photocatalytic disinfection using titanium dioxide: spectrum and mechanism of antimicrobial activity

Titanium Oxide Antibacterial Surfaces in Biomedical Devices

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