scholarly journals The Complex Compound of Amino Acids With Titanium (III) as a Method to Control and Synthesis of Different Structures of TiO2 Nanoparticles; Usage as Photocatalysts to Oxidize Alcohols to Aldehyde

2021 ◽  
Author(s):  
Yahya Absalan ◽  
Nazanin Noroozi Shad ◽  
Mostafa Gholizadeh
Keyword(s):  
Amino Acids ◽  
Titanium Dioxide ◽  
Uv Light ◽  
Chemical Analyses ◽  
Benzyl Alcohols ◽  
Titanium Dioxide Nanoparticle ◽  
Physical Chemical ◽  
Nitrobenzyl Alcohol ◽  
Different Types ◽  
Full Investigation

Abstract Different types of the amino acids (Glutamine, Glycine, Alanine) were used to coordinate TiCl3 in order to investigating the best precursor for synthesis of TiO2. Also, a full investigation was carried out to synthesis four different structures of TiO2 nanoparticles [TiO2 (A0.8R0.2), TiO2 (A0.6R0.4), TiO2 (Anatase), and TiO2 (Rutile)]. Oxidation of derivatives alcohol to their corresponding aldehyde through the obtained nanoparticles, as a photocatalyst, under UV light was considered to investigate the best structure of TiO2. Different physical-chemical analyses were applied to investigate the result. The result showed that the titanium dioxide nanoparticle, synthesized from glycine was obtained at the least temperature and was chosen as a precursor to synthesis of four different types of TiO2. All the synthesized TiO2 were applied for oxidation of benzyl alcohols into benzaldehyde, as a test, and TiO2 (A0.6R0.4) could give the best result (87% efficiency). Then it was used to oxidize benzyl alcohol, 4-cholorobenzyl alcohol, 4-nitrobenzyl alcohol and 4-methoxybenzyl alcohol to their corresponding aldehyde and efficiency were 74, 92, 87, and 65% respectively.

scholarly journals Ag(I)/TiO2-Photocatalyzed N-Methylation of Amino Acids with Methanol

2020 ◽  
Author(s):  
Yuna Morioka ◽  
Ivven Huang ◽  
Susumu Saito ◽  
Hiroshi Naka
Keyword(s):  
Amino Acids ◽  
Titanium Dioxide ◽  
Uv Light ◽  
Optical Purity

<div><div><div><p>Silver(I)-loaded titanium dioxide (AgNO3/TiO2) catalyzes the direct N-methylation of amino acids with methanol under irradiation with UV light. This method produces a variety of N-methyl and N,N-dimethyl amino acids with retention of their optical purity.</p></div></div></div>

scholarly journals Cobalt Oxide-Modified Titanium Dioxide Nanoparticle Photocatalyst for Degradation of 2,4-Dichlorophenoxyacetic Acid

2017 ◽  
Vol 17 (2) ◽  
pp. 284 ◽  
Author(s):  
Leny Yuliati ◽  
Nur Azmina Roslan ◽  
Wai Ruu Siah ◽  
Hendrik Oktendy Lintang
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Cobalt Oxide ◽  
Uv Light ◽  
Dichlorophenoxyacetic Acid ◽  
Photocatalytic Reaction ◽  
Impregnation Method ◽  
Titanium Dioxide Nanoparticle ◽  
2,4 Dichlorophenoxyacetic Acid

2,4-dichlorophenoxyacetic acid (2,4-D) has been recognized as a possibly carcinogenic compound to human, therefore, 2,4-D should be treated before it is discharged to the environment. Photocatalytic degradation of 2,4-D has been proposed as one of the best methods that offer environmentally safe process. In the present research, titanium dioxide (TiO2) was modified with cobalt oxide (CoO) and tested for photocatalytic degradation of 2,4-D under UV light irradiation. Different amounts of CoO (0.1, 0.5, 1 and 5 mol%) were added onto TiO2 by an impregnation method. The photocatalytic reaction was monitored and analyzed by measurement of 2,4-D absorbance using UV spectrophotometer. After 1 h photocatalytic reaction, it was confirmed that the sample with low loading of 0.1 mol% gave the highest photocatalytic activity among the bare and modified TiO2 photocatalysts. The photocatalytic activity was decreased with the increase of CoO loading, suggesting that the optimum amount of CoO was an important factor to improve the performance of TiO2. Based on fluorescence spectroscopy, such addition of CoO resulted in the reduced emission intensity, which showed the successful decrease in the electron-hole recombination.

scholarly journals Ag(I)/TiO2-Photocatalyzed N-Methylation of Amino Acids with Methanol

2020 ◽  
Author(s):  
Yuna Morioka ◽  
Ivven Huang ◽  
Susumu Saito ◽  
Hiroshi Naka
Keyword(s):  
Amino Acids ◽  
Titanium Dioxide ◽  
Uv Light ◽  
Optical Purity

<div><div><div><p>Silver(I)-loaded titanium dioxide (AgNO3/TiO2) catalyzes the direct N-methylation of amino acids with methanol under irradiation with UV light. This method produces a variety of N-methyl and N,N-dimethyl amino acids with retention of their optical purity.</p></div></div></div>

scholarly journals Effects of Titanium Dioxide Nanoparticles on Photosynthetic and Antioxidative Processes of Scenedesmus obliquus

Plants ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1748
Author(s):  
Zhou Li ◽  
Philippe Juneau ◽  
Yingli Lian ◽  
Wei Zhang ◽  
Shanquan Wang ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Green Algae ◽  
Uv Light ◽  
Titanium Dioxide Nanoparticles ◽  
Scenedesmus Obliquus ◽  
Freshwater Ecosystems ◽  
Oxygen Species ◽  
Nano Tio2 ◽  
Titanium Dioxide Nanoparticle ◽  
Cell Membrane Disruption

The effects of the photocatalytic toxicity of titanium dioxide nanoparticle (nano-TiO2) on phytoplankton are well understood. However, as UV light intensity decreases sharply with the depth of the water column, the effects of nano-TiO2 itself on deeper water phytoplankton, such as green algae, need further research. In this research, we investigated the effects of three sizes of TiO2 (10, 50 and 200 nm) on the photosynthetic and antioxidative processes of Scenedesmus obliquus in the absence of UV light. We found that 50 nm and 10 nm TiO2 (10 mg/L) inhibited growth rates and the maximal photosystem II quantum yield compared to the control in Scenedesmus obliquus. The minimal and maximal fluorescence yields, and the contents of reactive oxygen species and lipid peroxidation, increased, indicating that photosynthetic energy/electrons transferred to oxygen and induced oxidative stress in nano-TiO2-treated samples. In addition, we found that aggregations of algae and 10 nm TiO2 were present, which could induce cell membrane disruption, and vacuoles were induced to cope with nano-TiO2 stress in Scenedesmus obliquus. These results enhance our understanding of the effects of nano-TiO2 on the photosynthetic and antioxidative processes of green algae, and provide basic information for evaluating the ecotoxicity of nano-TiO2 in freshwater ecosystems.

scholarly journals Site-specific recognition of SARS-CoV-2 nsp1 protein with a tailored titanium dioxide nanoparticle

2021 ◽  
Author(s):  
Peter Agback ◽  
Tatiana Agback ◽  
Francisco Dominguez ◽  
Elena I Frolova ◽  
Gulaim Seisenbaeva ◽  
...  
Keyword(s):  
Amino Acids ◽  
Titanium Dioxide ◽  
Severe Acute Respiratory Syndrome ◽  
World Wide ◽  
Site Specific ◽  
Titanium Dioxide Nanoparticle ◽  
Unique Site ◽  
Protein Functions ◽  
Oxide Nanoparticle ◽  
First Time

The ongoing world-wide Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2) pandemic shows the need for new sensing and therapeutic means against the CoV viruses. The SARS-CoV-2 nsp1 protein is important, both for replication and pathogenesis, making it an attractive target for intervention. In recent years nanoparticles have been shown to interact with peptides, ranging in size from single amino acids up to proteins. These nanoparticles can be tailor-made with specific functions and properties including bioavailability. To the best of our knowledge, in this study we show for the first time that a tailored titanium oxide nanoparticle interacts specifically with a unique site of the full-length SARS-CoV-2 nsp1 protein. This can be developed potentially into a tool for selective control of viral protein functions.

scholarly journals Ag(I)/TiO2-Photocatalyzed N-Methylation of Amino Acids with Methanol

2020 ◽  
Author(s):  
Yuna Morioka ◽  
Ivven Huang ◽  
Susumu Saito ◽  
Hiroshi Naka
Keyword(s):  
Amino Acids ◽  
Titanium Dioxide ◽  
Uv Light ◽  
Optical Purity

<div><div><div><p>Silver(I)-loaded titanium dioxide (AgNO3/TiO2) catalyzes the direct N-methylation of amino acids with methanol under irradiation with UV light. This method produces a variety of N-methyl and N,N-dimethyl amino acids with retention of their optical purity.</p></div></div></div>

Methionine-Specific Staining of Collagen

1982 ◽  
Vol 40 ◽  
pp. 294-295
Author(s):  
E.M. Kuhn ◽  
K.D. Marenus ◽  
M. Beer
Keyword(s):  
Amino Acids ◽  
Collagen Fibers ◽  
Type Iii Collagen ◽  
Type I ◽  
Electron Microscopic ◽  
Good Correspondence ◽  
Specific Staining ◽  
Type Iii ◽  
Different Types ◽  
Sulfur Containing

Fibers composed of different types of collagen cannot be differentiated by conventional electron microscopic stains. We are developing staining procedures aimed at identifying collagen fibers of different types.Pt(Gly-L-Met)Cl binds specifically to sulfur-containing amino acids. Different collagens have methionine (met) residues at somewhat different positions. A good correspondence has been reported between known met positions and Pt(GLM) bands in rat Type I SLS (collagen aggregates in which molecules lie adjacent to each other in exact register). We have confirmed this relationship in Type III collagen SLS (Fig. 1).

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