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1.
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    Study of different carbonaceous materials as modifiers of screen-printed carbon electrodes for the triazid as potential antiviral drug / A. V. Ivoilova, N. A. Malakhova, P. N. Mozharovskaia [et al.] // Electroanalysis. - 2022. - Vol. 34, № 11. - P1745-1755
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: In this work a comparative study of Screen-Printed Carbon Electrodes (SPCE) – bare and modified by drop casting with carbonaceous nanomaterials (CNMs) as Multi Walled Carbon Nanotubes (MWCNT), Carbon Black and Functionalized Carbon Black for voltammetric determination of 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidinide l-arginine monohydrate (Triazid) as a potential drug with a broad spectrum of antiviral activity is reported. Bare SPCE and CNMs modified SPCE (SPCE/CNMs) have been characterized morphologically by SEM and electrochemically by cyclic voltammetry/electrochemical impedance spectroscopy with [Fe(CN)6]4−/3− as redox probe. Significant improvement of electrochemical performances is achieved with SPCE/CNMs compared with the bare SPCE. Among SPCE/CNMs studied SPCE modified with MWCNT (SPCE/CNT) is characterized by the best combination of electrochemical properties and electroanalytical performance towards TD. The linear dynamic range is 25–200 mg L−1 (R2=0.9975) with the limit of detection – 2.8 mg L−1 Triazid using SPCE/CNT and Square-Wave Voltammetry technique. The developed sensor was successfully used for Triazid determination in the Pharmaceutical Substance “TRIAZID”. The results achieved with SPCE/CNMs after chemical binding of dissolved oxygen in 0.04 M Britton-Robinson buffer+0.04 M Na2SO3 (pH 7.2±0.2) are very useful for further development of cost-effective and time-consuming pharmaceutical routine assay.

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2.
Инвентарный номер: нет.
   
   R 32


   
    Redox conversions of 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4triazolo[1,5-a]pyrimidinide l-arginine monohydrate as a promising antiviral drug / A. V. Ivoilova, A. N. Tsmokalyuk, P. N. Mozharovskaia [et al.] // Molecules. - 2021. - Т. 26, № 16. - Ст. 5087
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
NITRO-1,2,4-TRIAZOLO[1,5A]PYRIMIDINES -- TRIAZID -- NITRO GROUP TRANSFORMATIONS -- NITROAROMATIC COMPOUNDS
Аннотация: This article presents the results of a study of electrochemical transformations in aqueous and aprotic media of 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidinide l-arginine monohydrate (1a, Triazid) obtained by electrochemical methods and ESR spectroscopy. The effect of pH on the current and the reduction potential of 1a in an aqueous Britton–Robinson buffer solution was studied. It was found that 1a is irreversibly reduced in aqueous acidic media on a glassy carbon electrode in one stage with the participation of six electrons and the formation of 5-methyl-6-amino-7-oxo-1,2,4-triazolo[1,5-a]pyrimidin. The electroreduction of 1a in DMF on a background of tetrabutylammonium salts proceeds in two stages, controlled by the kinetics of second-order reactions. In the first stage, the reduction of 1a is accompanied by protonation by the initial compound of the basic intermediate products formed in the electrode reaction (self-protonation mechanism). The second quasi-reversible stage of the electroreduction 1a corresponds to the formation of a dianion radical upon the reduction of the heterocyclic anion 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidin, which is formed upon the potentials of the first peak. The ESR spectrum of the radical dianion was recorded upon electroreduction of Triazid in the presence of Bu4NOH. The effect of the formation of ion pairs on the reversibility of the second peak of the 1a transformation is shown. A change in the rate and regioselectivity of the protonation of the dianion radical in the presence of Na+ and Li+ ions is assumed. The results of studying the electroreduction of 1a by ESR spectroscopy with a TEMPO trap make it possible to assume the simultaneous formation of both a nitroxyl radical and a radical with the spin density localized on the nitrogen at the 4 position of the six-membered ring

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