Antioxidant vs. prooxidant action of phenothiazine in a biological environment in the presence of hydroxyl and hydroperoxyl radicals: a quantum chemistry study

RSC Advances ◽  
2015 ◽  
Vol 5 (19) ◽  
pp. 14678-14689 ◽  
Author(s):  
C. Iuga ◽  
A. Campero ◽  
A. Vivier-Bunge
Keyword(s):  
Aqueous Solution ◽  
Quantum Chemistry ◽  
Biological Environment ◽  
Prooxidant Action

In aqueous solution, phenothiazine regenerates and acts as an excellent antioxidant while in lipid media, it behaves as a prooxidant.

The Hygroscopy of Amino Acid Ionic Liquids in Aqueous Solution: a Quantum Chemistry Study

2016 ◽  
Vol 230 (11) ◽  
Author(s):  
Xueying Zhu ◽  
Hongqi Ai
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquids ◽  
Amino Acid ◽  
Quantum Chemistry ◽  
Binary Systems ◽  
Low Cost ◽  
Environmental Engineering ◽  
Solution Property ◽  
Chiral Property

AbstractDue to many remarkable advantages, such as biodegradability, low cost, chiral property, no toxicity, and excellent solution property, amino acid ionic liquids (AAILs) have received more and more attention and recognition in many chemical and environmental engineering fields. The intervention of water would significantly influence their properties.To understand this effect, the binary systems of water with amino acid-based anion A (A = glycine (Gly

Effect of Crystalline Calcium Phosphate Coatings Prepared in an Aqueous Solution on Corrosion Resistance of Bioabsorbable Magnesium Alloy

2018 ◽  
Vol 782 ◽  
pp. 158-164
Author(s):  
Shin Watanabe ◽  
Takeshi Yabutsuka ◽  
Shigeomi Takai
Keyword(s):  
Aqueous Solution ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Calcium Phosphate ◽  
Mg Alloy ◽  
High Corrosion Resistance ◽  
Phosphate Coatings ◽  
Naoh Solution ◽  
Biological Environment ◽  
Calcium Phosphate Coatings

Bioabsorbable magnesium (Mg) alloy was anodized in 1.0 M NaOH solution. Then the anodized Mg alloy was immersed in an aqueous solution with three times concentration of Ca2+and HPO42-in comparison with those of biological environment to improve its corrosion resistance. The whole surface of Mg alloy was successfully coated with crystalline calcium phosphate (CaP) within 1 day. The CaP coated Mg alloys showed high corrosion resistance in SBF.

Impact of fluorination on the photophysics of the flavin chromophore: a quantum chemical perspective

2019 ◽  
Vol 21 (19) ◽  
pp. 9912-9923
Author(s):  
Mario Bracker ◽  
Fabian Dinkelbach ◽  
Oliver Weingart ◽  
Martin Kleinschmidt
Keyword(s):  
Aqueous Solution ◽  
Quantum Chemistry ◽  
Quantum Chemical ◽  
Fluorinated Derivatives

10-Methylisoalloxazine (MIA) and its fluorinated derivatives (6-9F-MIA) were investigated by means of quantum chemistry, looking into the influence of fluorination on fluorescence, absorption and inter-system crossing (ISC) in vacuum and in aqueous solution.

Structures Formed by Cryoprotective Agents Used in Freezc-Etching

1971 ◽  
Vol 29 ◽  
pp. 448-449
Author(s):  
G. G. Cocks ◽  
C. E. Cluthe
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Oxide ◽  
Liquid Nitrogen Temperature ◽  
Ice Crystals ◽  
Etching Technique ◽  
Structural Constituent ◽  
Cryoprotective Agents ◽  
Quick Freezing ◽  
Freeze Etching ◽  
Fractured Surface

The freeze etching technique is potentially useful for examining dilute solutions or suspensions of macromolecular materials. Quick freezing of aqueous solutions in Freon or propane at or near liquid nitrogen temperature produces relatively large ice crystals and these crystals may damage the structures to be examined. Cryoprotective agents may reduce damage to the specimem, hut their use often results in the formation of a different set of specimem artifacts.In a study of the structure of polyethylene oxide gels glycerol and sucrose were used as cryoprotective agents. The experiments reported here show some of the structures which can appear when these cryoprotective agents are used.Figure 1 shows a fractured surface of a frozen 25% aqueous solution of sucrose. The branches of dendritic ice crystals surrounded hy ice-sucrose eutectic can be seen. When this fractured surface is etched the ice in the dendrites sublimes giving the type of structure shown in Figure 2. The ice-sucrose eutectic etches much more slowly. It is the smooth continuous structural constituent surrounding the branches of the dendrites.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

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