scholarly journals Theoretical Description for Omeprazole Cathodical Electrochemical Determination, Assisted by Omeprazole Electrochemical Determination, Assisted by the Composite Poly(1,2,4-triazole) – VO(OH)

2021 ◽  
Vol 12 (3) ◽  
pp. 3012-3018
Keyword(s):  
Active Substance ◽  
Reduction Process ◽  
Pharmaceutical Formulations ◽  
Electrochemical Determination ◽  
Theoretical Description ◽  
Vanadium Compound ◽  
Process Behavior ◽  
Biological Liquids ◽  
Tetravalent State

In this work, we describe theoretically the possibility of omeprazole electrochemical determination, assisted by the composite containing vanadium oxyhydroxide as an active substance and the polymer of 1,2,4-triazolic derivative as a mediator. The omeprazole molecule undergoes a sulfoxide to sulfide reduction process over a trivalent vanadium compound. The vanadium oxyhydroxide, at its turn, may be oxidized to a tetravalent state, represented in two forms. The electroanalytical process behavior will be illustrated by a trivariate equation-set, analysis of which confirms the efficiency of the composite of poly (1,2,4-triazole) with VO(OH). Vanadium (III) oxyhydroxide may be efficiently used for omeprazole detection both in pharmaceutical formulations, food, and biological liquids.

scholarly journals The theoretical description for the electrochemical determination of 4-4´-dihydroxyazobenzene, assisted by a composite of squaraine dye with cobalt (iii) oxyhydroxide in pair with cobalt (iv) oxide

2020 ◽  
Vol 10 (6) ◽  
pp. 619
Author(s):  
Volodymyr Valentynovych Tkach ◽  
Marta V. Kushnir ◽  
Oleksandra V. Ahafonova ◽  
Mariia P. Mytchenok ◽  
Andrii V. Bocharov ◽  
...  
Keyword(s):  
Double Electric Layer ◽  
Electrochemical Determination ◽  
Theoretical Description ◽  
The Other ◽  
System A ◽  
Diffusion Controlled ◽  
Squaraine Dye ◽  
Efficient Diffusion ◽  
Biological Liquids

<p>The theoretical description for 4-4´-dihydroxyazobenzene CoO(OH) – assisted electrochemical determination in the mushroom pulp, food, and biological liquids has been described. In this system, a squaraine dye is used as a Cobalt(III)oxyhydroxide stabilizer and electron transfer mediator. It is shown that, contrary to the large part of the systems with cobalt (III) oxyhydroxide, this system will behave more stably, providing an efficient diffusion-controlled process. On the other hand, the oscillatory and monotonic instabilities, although possible, are caused by the double electric layer influences of either chemical or electrochemical stage.</p>

scholarly journals Nucleation of SiO$$_{2}$$-CaO-Al$$_{2}$$O$$_{3}$$ Slag in Oxidative Ladle Refining of Metallurgical Grade Silicon

2021 ◽  
Author(s):  
Erlend L. Bjørnstad ◽  
Gabriella Tranell
Keyword(s):  
Liquid Alloy ◽  
Molten Slag ◽  
Liquid Structure ◽  
Theoretical Description ◽  
Metallurgical Grade Silicon ◽  
Ladle Refining ◽  
Active Nature ◽  
Process Behavior ◽  
Surface Active ◽  
Grade Silicon

AbstractOxidative ladle refining (OLR) is the most used refining method in industrial production of metallurgical grade silicon. OLR is performed by purging the liquid alloy with oxygen-enhanced air at 1823 K to 1873 K, reacting with silicon and the primary slag forming impurities to a SiO$$_{2}$$ 2 -CaO-Al$$_{2}$$ 2 O$$_{3}$$ 3 slag. To further increase our capability to control this process, it is paramount to understand how the slag nucleates and forms, and represent it such that it is useful for predicting and controlling the process behavior. This work aims to formulate a comprehensive theoretical description of slag nucleation and formation at nano/microscale using classical macroscale thermodynamics, bridging these spatial regimes. To achieve this, the work argues that silica’s liquid structure allows its nuclei to exhibit “well defined” surfaces. Furthermore, silica is predicted to be highly surface active, so if its concentration is high while the slag nucleus is small, the SiO$$_{2}$$ 2 -CaO-Al$$_{2}$$ 2 O$$_{3}$$ 3 slag should retain silica’s surface properties. An experiment confirmed the surface active nature of silica in the SiO$$_{2}$$ 2 -CaO-Al$$_{2}$$ 2 O$$_{3}$$ 3 system. It was also shown that increasing the slag’s calcia concentration has a greater effect on the interfacial tension between the molten slag and liquid alloy than alumina, confirming industrial observations of the coupling between refining rate and relative alloy/slag composition.

scholarly journals The Theoretical Description for Magnesium Chlorate Electrochemical Determination on a Magnezone-XC Modified Electrode

2020 ◽  
Vol 12 (4) ◽  
Author(s):  
Volodymyr Valentynovych Tkach ◽  
Marta V. Kushnir ◽  
Silvio Cesar De Oliveira ◽  
Dilfuza M. Musayeva ◽  
Hanifa Zh. Salomova ◽  
...  
Keyword(s):  
Modified Electrode ◽  
Electrochemical Determination ◽  
Theoretical Description

scholarly journals Theoretical Description for Chlorantraniliprole Electrochemical Determination, Assisted by Squaraine Dye Nano Ag2O2 Composite

2020 ◽  
Vol 11 (2) ◽  
pp. 9278-9284
Keyword(s):  
Mathematical Model ◽  
Reaction Mechanism ◽  
Bifurcation Analysis ◽  
Electrochemical Determination ◽  
Theoretical Description ◽  
The Other ◽  
Linear Stability Theory ◽  
Oxide Nanoparticles ◽  
Monotonic Instability ◽  
Squaraine Dye

The theoretical description for the chlorantraniliprole electrochemical determination, assisted by the hybrid composite of squaraine dye with Ag2O2 nanoparticles, has been described. The correspondent reaction mechanism has been proposed, and the correspondent mathematical model has been developed and analyzed by means of linear stability theory and bifurcation analysis. It has been shown that the chlorantraniliprole electrochemical anodic determination on high potential may be efficiently provided by silver (I, III) oxide nanoparticles, stabilized by the squaraine dye. On the other hand, the oscillatory and monotonic instability is also possible, being caused by DEL influences of the electrochemical stage.

Electrochemical Determination of Dissolution Rates of Lyophilized Pharmaceutical Formulations

2001 ◽  
Vol 73 (21) ◽  
pp. 5296-5301 ◽  
Author(s):  
Serena D. Webb ◽  
Carl A. Koval ◽  
Catherine M. Randolph ◽  
Theodore W. Randolph
Keyword(s):  
Pharmaceutical Formulations ◽  
Electrochemical Determination ◽  
Dissolution Rates

scholarly journals Electrochemical Determination of Sudan Dyes and Two Manner to Realize it: a Theoretical Investigation

2020 ◽  
Vol 9 (4) ◽  
pp. 1451-1458
Keyword(s):  
Mathematical Models ◽  
Bifurcation Analysis ◽  
Stability Theory ◽  
Electrochemical Determination ◽  
Theoretical Description ◽  
Point Of View ◽  
Linear Stability Theory ◽  
Sudan Dyes ◽  
Monotonic Instability

In this work, a general theoretical description of the electrochemical determination of Sudan dyes by cathodic and anodic route has been made. Two mathematical models have been developed for each case, being, afterward, analyzed by means of linear stability theory and bifurcation analysis. It has been shown that in both cases, the systems are efficient from the electroanalytical point of view. The possibility for the oscillatory and monotonic instability has also been verified.

scholarly journals The Theoretical Description for Fluoxetine Electrochemical Determination, Assisted by CoO(OH)-Nanoparticles, Deposited Over the Squaraine Dye

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Volodymyr Valentynovych Tkach ◽  
Marta V. Kushnir ◽  
Silvio César De oliveira ◽  
Hanifa Zh. Salomova ◽  
Fazliddin Jalilov ◽  
...  
Keyword(s):  
Electrochemical Determination ◽  
Theoretical Description ◽  
Squaraine Dye
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