scholarly journals Facile Fabrication of Oxygen-Releasing Tannylated Calcium Peroxide Nanoparticles

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3864
Author(s):  
Ji Sun Park ◽  
Yeong Jun Song ◽  
Yong Geun Lim ◽  
Kyeongsoon Park
Keyword(s):  
Hydrogen Peroxide ◽  
Calcium Chloride ◽  
Tannic Acid ◽  
Calcium Ions ◽  
Precursor Solution ◽  
Acidic Environment ◽  
Calcium Peroxide ◽  
New Approach ◽  
Oxygen Generation ◽  
Facile Fabrication

This study reports a new approach for the facile fabrication of calcium peroxide (CaO2) nanoparticles using tannic acid (TA) as the coordinate bridge between calcium ions. Tannylated-CaO2 (TA/CaO2) nanoparticles were prepared by reacting calcium chloride (CaCl2) with hydrogen peroxide (H2O2) in ethanol containing ammonia and different amounts of TA (10, 25, and 50 mg). The prepared TA/CaO2 aggregates consisted of nanoparticles 25–31 nm in size. The nanoparticles prepared using 10 mg of TA in the precursor solution exhibited the highest efficiency for oxygen generation. Moreover, the oxygen generation from TA (10 mg)/CaO2 nanoparticles was higher in an acidic environment.

A New Approach to the Demonstration of Oxidase-Localization Using Tannic Acid Or Catechin

1973 ◽  
Vol 31 ◽  
pp. 698-699
Author(s):  
V. Mizuhira ◽  
Y. Futaesaku
Keyword(s):  
Cross Section ◽  
Tannic Acid ◽  
Elastic Fiber ◽  
The Other ◽  
New Approach ◽  
Tissue Block ◽  
Active Reaction ◽  
The Cross

Previously we reported that tannic acid is a very effective fixative for proteins including polypeptides. Especially, in the cross section of microtubules, thirteen submits in A-tubule and eleven in B-tubule could be observed very clearly. An elastic fiber could be demonstrated very clearly, as an electron opaque, homogeneous fiber. However, tannic acid did not penetrate into the deep portion of the tissue-block. So we tried Catechin. This shows almost the same chemical natures as that of proteins, as tannic acid. Moreover, we thought that catechin should have two active-reaction sites, one is phenol,and the other is catechole. Catechole site should react with osmium, to make Os- black. Phenol-site should react with peroxidase existing perhydroxide.

Highly porous Pd nanostructures and reduced graphene hybrids: excellent electrocatalytic activity towards hydrogen peroxide

2016 ◽  
Vol 40 (2) ◽  
pp. 1096-1099 ◽  
Author(s):  
Subash Chandra Sahu ◽  
Tapan Kumar Behera ◽  
Ajit Dash ◽  
Bijayalaxmi Jena ◽  
Arnab Ghosh ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Electrocatalytic Activity ◽  
New Approach ◽  
Reduced Graphene ◽  
Highly Porous

A new approach has been developed for highly porous Pd nanostructure–graphene hybrids as efficient electrocatalysts towards reduction of H2O2.

scholarly journals Conformal Coating by Liquid Route on Three-Dimensional Topology

2018 ◽  
Author(s):  
Poirot Nathalie ◽  
Raynal Pierre-Ivan
Keyword(s):  
Spin Coating ◽  
Three Dimensional ◽  
Precursor Solution ◽  
Solution Viscosity ◽  
Chemical Solution ◽  
New Approach ◽  
Conformal Coating ◽  
Si Substrates ◽  
Aspect Ratios ◽  
Post Annealing

We demonstrated a new approach to the production of three-dimensional-coated patterns using liquid route. Metallic perovskite oxides were coated onto three-dimensional (3D) microstructured substrates with different aspect ratios. The success of the method relies on the solution viscosity monitored by adding viscous liquid. The process of oxide thin films consists in three steps: preparing the precursor solution, coating the solution by spin-coating process onto three-dimensional-Si substrates and post-annealing. The chemical solution 3D-coating is conformal.

scholarly journals Facile Fabrication of Hierarchical rGO/PANI@PtNi Nanocomposite via Microwave-Assisted Treatment for Non-Enzymatic Detection of Hydrogen Peroxide

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1109 ◽  
Author(s):  
Fa-Gui He ◽  
Jia-Yi Yin ◽  
Gaurav Sharma ◽  
Amit Kumar ◽  
Florian J. Stadler ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
High Performance ◽  
Fast Response ◽  
Microwave Assisted ◽  
H2o2 Detection ◽  
Reduced Graphene ◽  
Large Active Area ◽  
Facile Fabrication ◽  
Novel Strategy ◽  
Enzymatic Detection

A hierarchical composite based on the modified reduced graphene oxide with platinum-nickel decorated polyaniline nano-spheres (rGO/PANI@PtNi) was facilely prepared via microwave-assisted self-reduction for an application in nonenzymatic hydrogen peroxide (H2O2) detection. Compared to the pristine rGO, the composite exhibited a much tougher surface due to the stacking of conductive PANI nano-spheres on rGO sheets, leading to good dispersion of PtNi nanoparticles and a large active area. Furthermore, the multi-valance Ni2+/3+ in the PtNi particles effectively promoted the catalytic property of Pt sites and facilitated a superior electrochemical performance of PtNi alloy than that of neat Pt. Owing to the synergistic effect of the improved electrical conductivity and the promoted electrocatalytical property, the modified glassy carbon electrode (GCE) with rGO/PANI@PtNi nanocomposite displayed an outstanding electrochemical sensitivity towards H2O2 with a fast response time (<2 s), a wide linear range (0.1–126.4 mM), a low detection limit (0.5 µM), as well as a long-life stability for one week without obvious degradation. This novel strategy opens a novel and promising approach to design high performance sensors for H2O2 detection.

scholarly journals Facile Fabrication of Metal Oxide Based Catalytic Electrodes by AC Plasma Deposition and Electrochemical Detection of Hydrogen Peroxide

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 888 ◽  
Author(s):  
Quang-Tan Bui ◽  
In-Keun Yu ◽  
Anantha Iyengar Gopalan ◽  
Gopalan Saianand ◽  
Woonjung Kim ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Metal Oxide ◽  
Photoelectron Spectroscopy ◽  
Electrode Materials ◽  
Plasma Deposition ◽  
Metal Oxide Nanoparticles ◽  
Modified Electrodes ◽  
Precursor Solution ◽  
X Ray ◽  
Cuo Nps

In this study, the fabrication of a metal oxide nanoparticles (NPs) dispersed catalytic electrode is described based on a new alternating current (AC) plasma deposition approach. The fabrication involves the treatment of AC plasma on a precursor solution comprised of metal salts such as CuCl2, FeCl2, and ZnCl2, and a monomer (acrylic acid) in the presence/absence of a cross-linker. Furthermore, the utility of such developed electrodes has been demonstrated for the electrochemical determination of hydrogen peroxide (H2O2). The electrode materials obtained through plasma treatment was characterized by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscope (SEM), contact angle measurements, energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry. Among the metal oxide modified electrodes prepared by the AC plasma deposition method, the copper oxide (CuO) NPs catalytic electrode exhibited significant oxidation and reduction peaks for H2O2 in phosphate-buffered saline solution. The catalytic electrode with CuO NPs exhibited a combination of good H2O2 sensing characteristics such as good sensitivity (63.52 mA M−1 cm−2), good selectivity, low detection limits (0.6 µM), fast sensing response (5 s), a wide linear range (0.5–8.5 mM), and good stability over 120 cycles. Based on our results, it is well demonstrated that plasma deposition could be effectively utilized for the fabrication of the catalytic electrode for detection of H2O2 concentrations. Further, the strategy of using AC plasma for fabrication of metal oxide-based modified electrodes could also be extended for the fabrication of other kinds of nanomaterials-based sensors.

scholarly journals Precipitation of Germanium from Sulphate Solutions Containing Tin and Indium Using Tannic Acid

2019 ◽  
Vol 9 (5) ◽  
pp. 966 ◽  
Author(s):  
Michał Drzazga ◽  
Andrzej Chmielarz ◽  
Grzegorz Benke ◽  
Katarzyna Leszczyńska-Sejda ◽  
Magdalena Knapik ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Tannic Acid ◽  
Process Conditions ◽  
Influence Of Temperature ◽  
Temperature Time

The precipitation of tannin complex of germanium from sulfuric solutions obtained after dross leaching was investigated. The tested solutions contained mainly zinc, germanium, indium, and tin. The influence of temperature, time, amount of added tannic acid and its purity was determined. The application of pure tannic acid allowed the precipitation of >99% of germanium and decreased its concentration in a solution <0.015 g/dm3. It required ca. 11–13 g of pure tannic acid per each 1 g of dissolved germanium. The preferred process conditions for Ge precipitation using powder tannic acid were 90 °C, 90 min, whereas for 20% aq. solution—5 min. It was found that 40% to 50% of tin coprecipitated at these conditions. Therefore, a detinning operation using hydrogen peroxide was proposed. It allowed the removal of >99% Sn and reduced its concentration in the solution below 0.025 g/dm3.

scholarly journals Localization of cerium-based reaction products by scanning laser reflectance confocal microscopy.

1990 ◽  
Vol 38 (3) ◽  
pp. 315-318 ◽  
Author(s):  
J M Robinson ◽  
B E Batten
Keyword(s):  
Hydrogen Peroxide ◽  
Confocal Microscopy ◽  
Scanning Laser ◽  
Reaction Products ◽  
Laser Confocal Microscopy ◽  
Light Microscope Level ◽  
New Approach ◽  
Detection Systems ◽  
Laser Reflectance ◽  
Hydrogen Peroxide Release

Scanning laser confocal microscopy was utilized to visualize sites of hydrogen peroxide release from stimulated neutrophils and lysosomal acid phosphatase in these and other cells using cerium in the detection systems. Imaging of the cerium-containing reactions was achieved by employing the reflectance mode of this instrument. Localization of these products at the light microscope level was direct and did not require other reactions to generate a visible product. This new approach to cerium cytochemistry should prove useful for many applications.

scholarly journals Enhancement by Hydrogen Peroxide of Calcium Signals in Endothelial Cells Induced by 5-HT1B and 5-HT2B Receptor Agonists

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Pavel V. Avdonin ◽  
Alexander D. Nadeev ◽  
Galina Yu. Mironova ◽  
Irina L. Zharkikh ◽  
Piotr P. Avdonin ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Endothelial Cells ◽  
Calcium Ions ◽  
Umbilical Vein ◽  
Oxygen Species ◽  
Calcium Signals ◽  
Vasodilatory Effect ◽  
Umbilical Vein Endothelial Cells ◽  
Endothelium Dependent Relaxation

Hydrogen peroxide, formed in the endothelium, acts as a factor contributing to the relaxation of blood vessels. The reason for this vasodilatory effect could be modulation by H2O2 of calcium metabolism, since mobilization of calcium ions in endothelial cells is a trigger of endothelium-dependent relaxation. The aim of this work was to investigate the influence of H2O2 on the effects of Ca2+-mobilizing agonists in human umbilical vein endothelial cells (HUVEC). We have found that H2O2 in concentration range 10-100 μM increases the rise of [Ca2+]i induced by 5-hydroxytryptamine (5-HT) and carbachol and does not affect the calcium signals of ATP, agonist of type 1 protease-activated receptor SFLLRN, histamine and bradykinin. Using specific agonists of 5-HT1B and 5-HT2B receptors CGS12066B and BW723C86, we have demonstrated that H2O2 potentiates the effects mediated by these types of 5-HT receptors. Potentiation of the effect of BW723C86 can be produced by the induction of endogenous oxidative stress in HUVEC. We have shown that the activation of 5-HT2B receptor by BW723C86 causes production of reactive oxygen species (ROS). Inhibitor of NADPH oxidases VAS2870 suppressed formation of ROS and partially inhibited [Ca2+]i rise induced by BW723C86. Thus, it can be assumed that vasorelaxation induced by endogenous H2O2 in endothelial cells partially occurs due to the potentiation of the agonist-induced calcium signaling.

Use and Removal of Sulfite by Conversion to Sulfate in the Preservation of Salt-Free Cucumbers†

1998 ◽  
Vol 61 (7) ◽  
pp. 885-890 ◽  
Author(s):  
R. F. MCFEETERS
Keyword(s):  
Hydrogen Peroxide ◽  
Lactic Acid ◽  
Lactic Acid Bacteria ◽  
Calcium Chloride ◽  
Cucumis Sativus ◽  
Equimolar Amount ◽  
Sodium Metabisulfite ◽  
Sulfate Ions

Cucumbers (Cucumis sativus) were microbiologically stable in cover liquid containing 300 ppm of added sodium metabisulfite (calculated as SO2), 20 mM calcium chloride, and HCl to give an equilibrated pH of 3.5. The sulfur(IV) oxoanions could be easily removed to nondetectable levels (&lt;3 ppm) by addition of an equimolar amount of hydrogen peroxide, which rapidly converted S(IV) primarily to sulfate ions. When sulfur(IV) oxoanions were removed from stored fresh cucumbers, 85% of the added metabisulfite could be accounted for by formation of sulfate ions. If cucumbers were heated before addition and removal of sulfur(IV) oxoanions, 96% of that added was converted to sulfate by hydrogen peroxide. Preservation of cucumbers in this way does not require fermentation, so addition of salt is not needed to select for lactic acid bacteria.

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