Antibacterial Properties of Poly(Quaternary Ammonium) Modified Gold and Titanium Dioxide Nanoparticles

2012 ◽  
Vol 12 (6) ◽  
pp. 4601-4606 ◽  
Author(s):  
Weijie Wan ◽  
John T. W. Yeow
Keyword(s):  
Titanium Dioxide ◽  
Quaternary Ammonium ◽  
Titanium Dioxide Nanoparticles ◽  
Antibacterial Properties

scholarly journals Biosynthesis and Characterization of Titanium Dioxide Nanoparticles Using Pithecellobium Dulce and Lagenaria Siceraria Aqueous Leaf Extract and Screening their Free Radical Scavenging and Antibacterial Properties

2015 ◽  
Vol 50 ◽  
pp. 80-95 ◽  
Author(s):  
S. Kalyanasundaram ◽  
M. Jeevan Prakash
Keyword(s):  
Titanium Dioxide ◽  
New Technologies ◽  
Titanium Dioxide Nanoparticles ◽  
Radical Scavenging ◽  
Antibacterial Properties ◽  
Biological Method ◽  
Lagenaria Siceraria ◽  
Biological Behaviour ◽  
Synthesis Of Nanoparticles ◽  
Xrd Techniques

The recent development and implementation of new technologies have led to new era, the nanorevolution which unfolds role of plants in bio and green synthesis of nanoparticles which seem to have drawn quite an unequivocal attention with a view of synthesizing stable nanoparticles. In this present work, we have compared titanium dioxide nanocrystals synthesized by both chemical method and biological method from Titanium tetra isopropoxide as precursor. The biological method was performed by using the aqueous plant extract of Pithecellobium dulce and Lagenaria siceraria. The synthesized nanocrystals were characterized by FTIR Spectroscopy, Scanning Electron Microscopy (SEM), Energy Dispersive Xray (EDAX), Transmission Electron Microscope (TEM) and X-ray diffraction (XRD) techniques and also Antioxidant assay and antimicrobial test were performed to evaluate its biological behaviour. The nanocrystals synthesized by biological method were found to have higher antioxidant potential, antimicrobial activity than chemically synthesized.

scholarly journals Homogeneous Coatings of Titanium Dioxide Nanoparticles on Corona-Treated Cotton Fabric for Enhanced Self-Cleaning and Antibacterial Properties

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Mojtaba Aalipourmohammadi ◽  
Abolfazl Davodiroknabadi ◽  
Ali Nazari
Keyword(s):  
Titanium Dioxide ◽  
Pathogenic Bacteria ◽  
Titanium Dioxide Nanoparticles ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Sunlight Irradiation ◽  
Self Cleaning ◽  
Mapping Techniques ◽  
Cellulosic Fabric ◽  
And Staphylococcus Aureus

Abstract This study discusses the effect of corona pretreatment and subsequent loading of titanium dioxide nanoparticles on self-cleaning and antibacterial properties of cellulosic fabric. The corona-pretreated cellulosic fabrics were characterized by field emission scanning electron microscopy, and X-ray mapping techniques revealed that layers of the titania deposited on cellulose fibers were more uniform than the sample without pre-corona treatment. The self-cleaning property of treated fabrics was evaluated through discoloring dye stain under sunlight irradiation. The antibacterial activities of the samples against two common pathogenic bacteria including Escherichia coli and Staphylococcus aureus were also assessed. The results indicated that self-cleaning and antibacterial properties of the corona-pretreated fabrics were superior compared to the sample treated with TiO2 alone. Moreover, using corona pretreatment leads to samples with good washing fastness.

Comparative Photoactivity and Antibacterial Properties of C60Fullerenes and Titanium Dioxide Nanoparticles

2009 ◽  
Vol 43 (12) ◽  
pp. 4355-4360 ◽  
Author(s):  
Léna Brunet ◽  
Delina Y. Lyon ◽  
Ernest M. Hotze ◽  
Pedro J. J. Alvarez ◽  
Mark R. Wiesner
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Antibacterial Properties

Applied Research Glass Ionomer Cement with TiO2 Nanoparticles in Orthodontic Treatment

2021 ◽  
Vol 21 (2) ◽  
pp. 1032-1041
Author(s):  
Jiajie Ren ◽  
Zhen Du ◽  
Jiang Lin
Keyword(s):  
Compressive Strength ◽  
Titanium Dioxide ◽  
Antibacterial Effect ◽  
Titanium Dioxide Nanoparticles ◽  
Glass Ionomer Cement ◽  
Antibacterial Properties ◽  
Surface Hardness ◽  
Glass Ionomer ◽  
Adhesion Properties ◽  
Ionomer Cement

In orthodontics treatment, scholars have tried to introduce nano antibacterial materials into the materials used in orthodontics to reduce the occurrence of enamel demineralization, caries and periodontitis. The experiment investigated the effect of adding titanium dioxide nanoparticles in different proportions on the flexural strength, compressive strength, surface hardness, tribological properties, adhesion properties, fluorine release properties and antibacterial properties of glass ionomer cement. The effect of water cement on orthodontics, the experiment added different proportions of titanium dioxide nanoparticles to traditional glass ion cement, which greatly improved the mechanical strength of glass ion cement, and significantly improved the antibacterial effect of glass ion cement, bending strength, compressive strength and surface hardness. The addition of titanium dioxide nanoparticles produced a significant antibacterial effect on Streptococcus mutants. Nano-TiO2 glass ionomer cement has a significant effect on orthodontics, and the damage to patients’ teeth is significantly lower, which is worthy of clinical popularization.

scholarly journals Antibacterial Additive for Polystyrene Based on Silver Nanoparticles Supported on Titanium Dioxide

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Miguel A. Waldo-Mendoza ◽  
Lucía Martínez-Jothar ◽  
Socorro Oros-Ruiz ◽  
E. G. Villabona-Leal ◽  
Luis Manuel Céspedes-Covarrubias ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Antibacterial Properties ◽  
Precipitation Method ◽  
Concentration Limit ◽  
Injection Molding Process ◽  
Molding Process ◽  
Plate Method

Silver nanoparticles supported on titanium dioxide nanoparticles (Ag/TiO2) were incorporated and evaluated as antibacterial additive for polystyrene materials. These particles were synthesized using a deposition-precipitation method by adding silver nitrate as metallic precursor, sodium hydroxide as reducing agent, and commercial TiO2 (P25) as support. Rectangular pieces of polystyrene (PS) containing 100, 300, 500, and 700 ppm (wt.%) of the additive were made using an extrusion-injection molding process, and they were evaluated for their antibacterial properties against Escherichia coli using the Pour Plate method. Particles were distributed on the PS surface, and PS pieces presented a good antibacterial efficiency at 100, 300, and 500 ppm and decreased for 700 ppm due to an additive agglomeration on the PS surface. These results validate the antibacterial properties of Ag/TiO2, determine a concentration limit at which the additive is well distributed on the PS surface, and assess the importance of Ag in this system.

scholarly journals Landscape of Lipidomic Metabolites in Gut-liver Axis of Sprague-Dawley Rats after Oral Exposure to Titanium Dioxide Nanoparticles

2020 ◽  
Author(s):  
Zhangjian Chen ◽  
Shuo Han ◽  
Pai Zheng ◽  
Jiahe Zhang ◽  
Shupei Zhou ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Lipid Metabolism ◽  
Liver Toxicity ◽  
Titanium Dioxide Nanoparticles ◽  
Food Additives ◽  
Antibacterial Properties ◽  
Oral Exposure ◽  
Sprague Dawley ◽  
Serum Samples ◽  
Lipid Metabolism Disorder

Abstract Background: The application of titanium dioxide nanoparticles (TiO2 NPs) as food additives poses a risk of oral exposure that may lead to adverse health effects. Even though the substantial evidence supported liver as the target organ of TiO2 NPs via oral exposure, the mechanism of liver toxicity remains largely unknown. Since the liver is a key organ for lipid metabolism, this study focused on the landscape of lipidomic metabolites in gut-liver axis of Sprague Dawley (SD) rats exposed to TiO2 NPs at 0, 2, 10, 50 mg/kg body weight per day for 90 days.Results: TiO2 NPs (50 mg/kg) caused slight hepatotoxicity and changed lipidomic signatures of main organs or systems in the gut-liver axis including liver, serum and gut. The cluster profile from the above biological samples all pointed to the same key metabolic pathway and metabolites, which was glycerophospholipid metabolism and Phosphatidylcholines (PCs), respectively. In addition, absolute quantitative lipidomics verified the changes of three PCs concentrations, including PC(16:0/20:1), PC(18:0/18:0) and PC(18:2/20:2) in the serum samples after treatment of TiO2 NPs (50 mg/kg). The contents of malondialdehyde (MDA) in serum and liver increased significantly, which were positively correlated with most differential lipophilic metabolites.Conclusions: The gut was presumed to be the original site of oxidative stress and disorder of lipid metabolism, which resulted in hepatotoxicity through the gut-liver axis. Lipid peroxidation may be the initial step of lipid metabolism disorder induced by TiO2 NPs. Most nanomaterials (NMs) have oxidation induction and antibacterial properties, so the toxic pathway revealed in the present study may be primary and universal.

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