Kinetic Methods of Analysis with Potentiometric and Spectrophotometric Detectors – Our Laboratory Experiences

Radić, Njegomir; Kukoc-Modun, Lea

doi:10.5772/52185

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…By an analogy with the classical kinetic methods [ 32 , 33 ], “Fixed time method” and “Initial rate method” can be used in the potentiometry. The absolute value of the potential cannot be selected as a changeable parameter in the “Initial rate method” because there is no potential pair and the equilibrium of the system is not achieved in the described method.…”

Section: Resultsmentioning

confidence: 99%

Kinetic Potentiometry as a Method for Studying the Interactions of Antioxidants with Peroxyl Radicals

Gerasimova,

Salimgareeva,

Magasumova

et al. 2023

Antioxidants

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This work presents a new method using kinetic potentiometry to study the thermodynamic and kinetic parameters of the reactions of antioxidants with peroxyl radicals. The rate constants of the reaction of antioxidants with radicals have been determined, and the groups of “fast” and “slow” antioxidants have been conventionally distinguished. Fast antioxidants include ascorbic, uric, gallic, chlorogenic, caffeic acids, glutathione, L-cysteine, and catechol with constant values from (1.05–9.25) × 103 M·s−1; “slow” antioxidants are α-tocopherol (in aqueous media), ionol, 2,6-ditretbutylphenol, and compounds of the azoloazine series, modified with polyphenolic fragments, with constant values from (4.00–8.50) × 102 M·s−1. It is shown that the value of the rate constant is directly related to the type of kinetic dependence of the potential recorded when an antioxidant is introduced into the solution of the radical initiator. It is shown that the method with the determination of the induction period is difficult in the study of “slow” antioxidants. It has been established that the area above the curve of the kinetic dependence Exp(∆E) is directly related to the amount of inhibited peroxyl radicals and can be used to assess the inhibitory properties of an antioxidant from a thermodynamic point of view. “Fixed time method” and “Initial rate method” were used. Positive correlations between the described method have been established. The utility of the parameter of the area above the curve of the kinetic dependence Exp(∆E) in the study of objects of complex composition is shown.

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Section: Resultsmentioning

confidence: 99%

Kinetic Potentiometry as a Method for Studying the Interactions of Antioxidants with Peroxyl Radicals

Gerasimova,

Salimgareeva,

Magasumova

et al. 2023

Antioxidants

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“…Within the overall spectrum of analytical methods, the kinetic ones have become increasingly interesting [1][2][3][4]. Besides their economic feasibility, one of their chief appeals resides precisely in the possibility of simultaneous determination of more analytical species without prior separation, although some pre-treatment of the sample (mineralising, filtering, concentrating etc.…”

Section: Introductionmentioning

confidence: 99%

Combined Kinetic Response of Two Substrates with Similar Reactive Patterns

Sabou¹,

Csavdari²

2017

Studia UBB Chemia

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ABSTRACT. The behaviour towards simultaneous oxidation by Cr(VI) in acidic environment of mixtures consisting of two structurally closely related thioethers (S-methylcysteine and DL-methionine) was tested, at 0.085 mol·l -1 H + and 298  0.1 K. The kinetic and mechanistic patterns of the two substrates when oxidized separately were already known and very similar. Based on that knowledge, the individual kinetic parameters (rate and equilibrium constants) were first computed. Theoretical predictive models for the value of the observed rate constant of a mixture, based on the kinetic data from non-mixtures, are compared with experimental findings and subsequently an empirical calibration surface obtained from all experiments is discussed. Due to differences in the kinetic parameters of the two reactions, in all models the obtained surfaces are asymmetrical, and this opens the possibility to univocally determine the concentrations of both the thioethers without separation.

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Assays to Estimate the Binding Affinity of Aptamers

Thevendran

Citartan

2022

Talanta

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Kinetic Methods of Analysis with Potentiometric and Spectrophotometric Detectors – Our Laboratory Experiences

Cited by 3 publications

References 35 publications

Kinetic Potentiometry as a Method for Studying the Interactions of Antioxidants with Peroxyl Radicals

Kinetic Potentiometry as a Method for Studying the Interactions of Antioxidants with Peroxyl Radicals

Combined Kinetic Response of Two Substrates with Similar Reactive Patterns

Assays to Estimate the Binding Affinity of Aptamers

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