A avaliação mecanística teórica da utilização de oxihidróxido de cobalto (III) em sensores eletroquímicos de tramadol

A possibilidade da detecção eletroquímica de tramadol in vivo e in vitro por meio dosensor, baseado em oxihidróxido de cobalto trivalente e no seu compósito com polímeroscondutores, foi avaliada do ponto de vista mecanístico. O modelo matemático,correspondente ao mecanismo de oxidação sugerido, foi desenvolvido e analisado,mediante a teoria de estabilidade linear e da análise de bifurcações. Foi detectadoque CoO(OH) pode aplicar-se na detecção eletroquímica de tramadol nos valoresde pH neutros e levemente alcalinos, correspondentes à oxidação mais eficiente docomposto. A possibilidade da aparição de instabilidades oscilatória e monotônicatambém foi verificada.The possibility of tramadol in vivo and in vitro electrochemical determination bymeans of the sensor, based on cobalt (III) oxyhydroxide and its composite withconducting polymers was evaluated from the mechanistic point of view. The mathematicalmodel, correspondent to the suggested mechanism, was developed andanalyzed by means of linear stability theory and bifurcation analysis. It was shownthat CoO(OH) may be applied to the tramadol electrochemical determination inneutral and lightly alkaline pH values, correspondent to the more efficient oxidationof the compound. The possibility of oscillatory and monotonic instabilities has alsobeen modified

The Theoretical Description for the Perylaldehyde Aldoxyme Anodic Electrochemical Determination, Assisted by the Novel Squaraine Dye Composite with Copper(ii) Sulfide Nanoparticles

In this work the perillaldehyde aldoxime electrochemical determination on an anode, modified by squaraine dye composite with copper sulfide nanoparticles is analyzed. The electroanalytical process involves the formation of trivalent copper species, capable to oxidize the analyte by two parallel mechanisms. The correspondent mathematical model, correspondent to both of them, has been developed and analyzed by means of linear stability theory and bifurcation analysis. The model analysis clearly shows that the composite of a squaraine dye in organic phase and bivalent copper sulfide in the inorganic phase may be an efficient electrode modifier for perillaldehyde aldoxime electrochemical determination on an anode. The electroanalytical process will be mostly kinetically-controlled with the possibility of the transfer to diffusion-controlled mode. On the other hand, both oscillatory and monotonic instabilities may be realized in the electroanalytical process, and their probability will depend on the direction of the electroanalytical scenario in the concrete conditions, due to the possibility of the formation of ionic compounds in the pre-surface layer. DOI: http://dx.doi.org/10.17807/orbital.v13i5.150

SUCRALOSE CoO(OH)-ASSISTED ELECTROCHEMICAL DETECTION IN ALKALINE MEDIA. THE THEORETICAL ANALYSIS OF AN INTERESTING POSSIBILITY

The sucralose electrochemical determination, assisted by cobalt (III) oxyhydroxide, has been theoretically evaluated. The mathematical model, describing the electroanalytical process, has been developed. The analysis of the model by linear stability theory and bifurcation analysis has shown that CoO(OH) may be applied as an efficient electrode modifier in the sucralose determination in neutral and lightly alkaline media. The electrochemical response has to be clear and easy to interpret. The oscillatory and monotonic instabilities may occur due to double electric layer influences of the electrochemical process

THE THEORETICAL DESCRIPTION FOR ECOPIPAM ELECTROCHEMICAL DETERMINATION ON A COBALT(III) OXYHYDROXIDE-BASED MATERIAL

The theoretical description for ecopipam electrochemical determination, assisted by cobalt(III) oxyhydroxide has been given. The correspondent mathematical model has been developed and analyzed by means of linear stability theory and bifurcation analysis. It has been shown that, despite of the electrochemical instabilities, more probable to occur than for the similar systems, the cobalt (III) oxyhydroxide is an efficient electrode modifier for ecopipam determination. The electroanalytical process is diffusion-controlled

El mecanismo de la electrooxidación de procarbacina y su descripción matemática

Al proceso de la electrooxidación de procarbacina fue atribuido el mecanismo, incluyendo dos etapas electroquímicas y las dos químicas. También, ha sido desarrollado y analizado un modelo matemático, capaz de describir el comportamiento del sistema.Por su intermedio, se dio la posibilidad de comparar el comportamiento de este sistema con el de los semejantes y análogos, como con el sistema de la electrosíntesis de monómeros.A mechanism, including two electrochemical and two chemical stages, has been attributed to the procarbazine electrooxidation. Also, a mathematical model, capable to describe the system’s behavior, has been developed. My its means, it was possible to compare the behavior of this system with that of the monomers’ electrosynthesis

The Theoretical Description for the Perylaldehyde Aldoxyme Anodic Electrochemical Determination, Assisted by the Novel Squaraine Dye Composite with Copper(ii) Sulfide Nanoparticles

In this work the perillaldehyde aldoxime electrochemical determination on an anode, modified by squaraine dye composite with copper sulfide nanoparticles is analyzed. The electroanalytical process involves the formation of trivalent copper species, capable to oxidize the analyte by two parallel mechanisms. The correspondent mathematical model, correspondent to both of them, has been developed and analyzed by means of linear stability theory and bifurcation analysis. The model analysis clearly shows that the composite of a squaraine dye in organic phase and bivalent copper sulfide in the inorganic phase may be an efficient electrode modifier for perillaldehyde aldoxime electrochemical determination on an anode. The electroanalytical process will be mostly kinetically-controlled with the possibility of the transfer to diffusion-controlled mode. On the other hand, both oscillatory and monotonic instabilities may be realized in the electroanalytical process, and their probability will depend on the direction of the electroanalytical scenario in the concrete conditions, due to the possibility of the formation of ionic compounds in the pre-surface layer. DOI: http://dx.doi.org/10.17807/orbital.v13i5.150

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

An interesting electroanalytical process for magnesium chlorate electrochemical determination has been described theoretically. The process involves the complex formation of magnesium cation with the azo dye Magnezone XC and the electropolymerization of the resulting complex compound in the presence of the chlorate-ion by two parallel mechanisms. The correspondent mathematical model has been developed and analyzed by means of linear stability theory and bifurcation analysis. It has been shown that from both electroanalytical and electrosynthetical points of view the system is efficient. The linear dependence between the electrochemical parameter and salt concentration is obtained easily, and the material formed during the electroanalytical process is highly conductive and catalytic. On the other hand, the oscillatory behavior in this system will be caused by double electric layer influences on both complexation and electropolymerization stages. DOI: http://dx.doi.org/10.17807/orbital.v12i4.153

THE POSSIBILITY OF NALBUPHIN CoO(OH)-ASSISTED ELECTROCHEMICAL DETECTION AND ITS MATHEMATICAL DESCRIPTION

The possibility of nalbuphin electrochemical determination over a CoO(OH)-modified electrode has been studied from the theoretical point of view. The correspondent mathematical model has been developed and analyzed by means of linear stability theory and bifurcation analysis. It was shown that CoO(OH) may be applied as an efficient electrode modifier in the detection of nalbuphin in neutral and lightly alkaline media. The electrochemical response has to be clear and easy to interpret. The possibility of the oscillatory and monotonic instabilities has also been verified

A detecção eletroquímica da lidocaína sobre o oxihidróxido de cobalto trivalente. Uma possibilidade teórica a ser avaliada

O comportamento eletroquímico da lidocaína durante a sua eletrooxidação sobre o oxihidróxido de cobalto trivalente em meio levemente básico, realizada para fins eletroanalíticos, foi avaliado do ponto de vista mecanístico matemático. Da análise foi feita uma conclusão acerca do desempenho do CoO(OH) como modificador de elétrodo na eletrooxidação da lidocaína in vivo e in vitro. Foi, outrossim, verificadaa possibilidade da realização das instabilidades oscilatória e monotônica no sistema.The electrochemical behavior of lidocaine during its electrooxidation over trivalent cobalt oxyhydroxide in lightly alkaline medium, realized for electroanalytical purposes, was evaluated from the mechanistic mathematical point of view. From analysis a conclusion has been made of the electroanalytical function of CoO(OH)as an electrode modifier for lidocaine electrooxidation in vivo and in vitro. Also, the possibility of oscillatory and monotonic instabilities has been verified in the system

THE MATHEMATICAL DESCRIPTION OF STEVIOL ELECTROCHEMICAL OXIDATION ON CARBON ELECTRODES IN NEUTRAL MEDIA

The steviol electrochemical oxidation, realized for electroanalytical purposes, was theoretically evaluated. The mechanism for steviol electrooxidation has been suggested, and the correspondent mathematical model has been evaluated by means of the linear stability theory and bifurcation analysis. It was shown that, despite of the possibility of Kolbe electrochemical decarboxylation and its influences, the steady-state stability is easy to maintain. The oscillatory and monotonic instabilities for this case are more probable than for the similar ones