M. Al-Shwaiyat, A. Vishnikin, L. P. Tsiganok, Ekaterina V. Kabashnaya, S. A. Khmelovskaya, V. Andruch, Y. Bazel, H. Sklenářová, P. Solich
Simple, sensitive and selective sequential injection analysis (SIA) method for the analgine determination has been developed on the basis of fast reaction between analgine and 18-molybdo-2-phosphate heteropoly anion (18-MPA). Under found optimal conditions (0.01 M HCl, C(18-MPA) = 2 mmol/L) linear calibration curve was obtained over the range from 0.5 to 80 mg/L of analgine, and detection limit (S/N = 3) was 0.2 mg/L. The proposed SIA method has high sample throughput of 45 h -1 and small reagent consumption (0.08 mL). The procedure was successfully applied to the analysis of pharmaceuticals.
建立了一种简便、灵敏、选择性的序列注射分析(SIA)方法，用于测定安甘氨酸与18-钼-2-磷酸杂多阴离子(18-MPA)之间的快速反应。在最佳条件(0.01 M HCl, C(18 mpa) = 2 mmol/L)下，在0.5 ~ 80 mg/L范围内获得线性校准曲线，检出限(S/N = 3)为0.2 mg/L。所提出的SIA方法具有45 h -1的高样品通量和0.08 mL的小试剂消耗。该方法已成功地应用于药物分析。
{"title":"Sequential injection spectrophotometric determination of analgine in pharmaceutical formulations using 18-molybdo-2-phosphate heteropoly anion as chromogenic reagent","authors":"M. Al-Shwaiyat, A. Vishnikin, L. P. Tsiganok, Ekaterina V. Kabashnaya, S. A. Khmelovskaya, V. Andruch, Y. Bazel, H. Sklenářová, P. Solich","doi":"10.15421/081301","DOIUrl":"https://doi.org/10.15421/081301","url":null,"abstract":"Simple, sensitive and selective sequential injection analysis (SIA) method for the analgine determination has been developed on the basis of fast reaction between analgine and 18-molybdo-2-phosphate heteropoly anion (18-MPA). Under found optimal conditions (0.01 M HCl, C(18-MPA) = 2 mmol/L) linear calibration curve was obtained over the range from 0.5 to 80 mg/L of analgine, and detection limit (S/N = 3) was 0.2 mg/L. The proposed SIA method has high sample throughput of 45 h -1 and small reagent consumption (0.08 mL). The procedure was successfully applied to the analysis of pharmaceuticals.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"21 1","pages":"7-19"},"PeriodicalIF":0.0,"publicationDate":"2014-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67578377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
On the basis of the classical theory of galvanostatic nucleation and Vetter’s kinetic conception, formation of zinc nuclei on the tungsten electrode from the zincate electrolyte (0.5 М ZnO, 6 M NaOH) has been investigated. In the region of the current density 200 - 600 mАсm -2 the charge transfer overpotential (100 - 200 mV), the crystallization overpotential (50 - 60 mV), the nucleation work ((2 - 12)×10 -20 J), the number of atoms in the nuclei (2 - 10) were determined. It was proved that nucleation take place on reduced sites of the oxidized tungsten surface. Within the range of studied diapason of current densities nucleis are forming on energetically similar electrode centers. The low value of the charge transfer coefficient (α = 0.26) indicates a weak effect of the double layer electrical field on the activation energy of charge transfer.
{"title":"The stages of galvanostatic nucleation of zinc on the tungsten electrode from a zincate solution","authors":"Iurii G. Krishtop, T. N. Kalyuzhna, V. Trofimenko","doi":"10.15421/081310","DOIUrl":"https://doi.org/10.15421/081310","url":null,"abstract":"On the basis of the classical theory of galvanostatic nucleation and Vetter’s kinetic conception, formation of zinc nuclei on the tungsten electrode from the zincate electrolyte (0.5 М ZnO, 6 M NaOH) has been investigated. In the region of the current density 200 - 600 mАсm -2 the charge transfer overpotential (100 - 200 mV), the crystallization overpotential (50 - 60 mV), the nucleation work ((2 - 12)×10 -20 J), the number of atoms in the nuclei (2 - 10) were determined. It was proved that nucleation take place on reduced sites of the oxidized tungsten surface. Within the range of studied diapason of current densities nucleis are forming on energetically similar electrode centers. The low value of the charge transfer coefficient (α = 0.26) indicates a weak effect of the double layer electrical field on the activation energy of charge transfer.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"21 1","pages":"95-101"},"PeriodicalIF":0.0,"publicationDate":"2014-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67579675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The anions HSO 4 - and SO 4 2- can be involved to the process of iron’s subgroup metals anodic dissolution and passivation in sulfuric acid solutions. The possible effect sulfuric acid on the anodic behavior of nickel in acidic solutions was analyzed with mathematic modeling application. Our results have shown a decrease of maximum current on the anode polarization curve in the case of sulfate anions adsorption on the nickel surface. In this case the slope of Tafel plot of nickel active dissolution and the potentials of maximum currents may change. Maximum currents increasing have been occur in the cases as a direct involvement of sulfuric acid in the dissolution stage of nickel as inclusion of anions into the oxygen-containing films. It was found that anions of sulfuric acid practically didn’t influence on the anodic polarization curve of nickel electrode in the range of SO 4 2- anion concentration from 0.2 to 1.2 Eq/L (pH = 1.0). These data allows to argue that the sulfate anions do not affect on the general mechanism of anodic dissolution and passivation of nickel.
{"title":"Вплив аніонів сульфатної кислоти на анодну поведінку нікелю","authors":"Lina V. Petrenko, V. I. Korobov, Valery Ochkov","doi":"10.15421/081311","DOIUrl":"https://doi.org/10.15421/081311","url":null,"abstract":"The anions HSO 4 - and SO 4 2- can be involved to the process of iron’s subgroup metals anodic dissolution and passivation in sulfuric acid solutions. The possible effect sulfuric acid on the anodic behavior of nickel in acidic solutions was analyzed with mathematic modeling application. Our results have shown a decrease of maximum current on the anode polarization curve in the case of sulfate anions adsorption on the nickel surface. In this case the slope of Tafel plot of nickel active dissolution and the potentials of maximum currents may change. Maximum currents increasing have been occur in the cases as a direct involvement of sulfuric acid in the dissolution stage of nickel as inclusion of anions into the oxygen-containing films. It was found that anions of sulfuric acid practically didn’t influence on the anodic polarization curve of nickel electrode in the range of SO 4 2- anion concentration from 0.2 to 1.2 Eq/L (pH = 1.0). These data allows to argue that the sulfate anions do not affect on the general mechanism of anodic dissolution and passivation of nickel.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"21 1","pages":"102-110"},"PeriodicalIF":0.0,"publicationDate":"2014-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67579693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper is investigated the process of crude oil and its individual fractions cracking in the molten metals medium to produce light petroleum products. Thermodynamic calculations demonstrate the possibility of using lead and tin including alloys thereof as the melt. The cracking of West Siberian crude oil is studied at temperatures 400-600 °C. It is detected that as the temperature increases there is increase of aromatic hydrocarbons and olefins content in gasoline while naphthenes, n - and i -paraffins content reduces. Optimal temperature for cracking in molten metals is ~500 °C. The use of a submerged nozzle increases the yield of light petroleum products by ~2%. The research octane number of gasoline produced is 82-87 points. It is determined that the yield of light petroleum products depending on the experimental conditions is increased from 46.9 to 55.1-61.3% wt.
{"title":"Cracking of crude oil in the molten metals","authors":"M. Glikin, V. Tarasov, Evgeniy Yu. Chernousov","doi":"10.15421/081312","DOIUrl":"https://doi.org/10.15421/081312","url":null,"abstract":"In this paper is investigated the process of crude oil and its individual fractions cracking in the molten metals medium to produce light petroleum products. Thermodynamic calculations demonstrate the possibility of using lead and tin including alloys thereof as the melt. The cracking of West Siberian crude oil is studied at temperatures 400-600 °C. It is detected that as the temperature increases there is increase of aromatic hydrocarbons and olefins content in gasoline while naphthenes, n - and i -paraffins content reduces. Optimal temperature for cracking in molten metals is ~500 °C. The use of a submerged nozzle increases the yield of light petroleum products by ~2%. The research octane number of gasoline produced is 82-87 points. It is determined that the yield of light petroleum products depending on the experimental conditions is increased from 46.9 to 55.1-61.3% wt.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"21 1","pages":"111-117"},"PeriodicalIF":0.0,"publicationDate":"2014-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67579295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This review covers the literature published over the last 5 years on the practical use, synthesis, and oxidation of 1,4-dihydropyridines (1,4-DHP). A summary is given on recent research on the biological activity of 1,4-DHP (Hantzsch esters) as antioxidants and calcium channel antagonists. The article provides information about the main trends in the development of pharmaceuticals based on 1,4-DHP. The main directions of the synthesis of 1,4-DHP systems, closely linked to the development of new biologically active substances, are discussed. New and traditional methods for the aromatization of 1,4-DHP are summarized, including recent studies on the mechanism of this reaction.
{"title":"Main directions of development in 1,4-dihydropyridines chemistry – a review","authors":"O. Y. Nesterova, H. O. Hryshchenko","doi":"10.15421/081308","DOIUrl":"https://doi.org/10.15421/081308","url":null,"abstract":"This review covers the literature published over the last 5 years on the practical use, synthesis, and oxidation of 1,4-dihydropyridines (1,4-DHP). A summary is given on recent research on the biological activity of 1,4-DHP (Hantzsch esters) as antioxidants and calcium channel antagonists. The article provides information about the main trends in the development of pharmaceuticals based on 1,4-DHP. The main directions of the synthesis of 1,4-DHP systems, closely linked to the development of new biologically active substances, are discussed. New and traditional methods for the aromatization of 1,4-DHP are summarized, including recent studies on the mechanism of this reaction.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"21 1","pages":"66-86"},"PeriodicalIF":0.0,"publicationDate":"2014-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67578788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Novel 2-(3,5-dioxo-4-azatricyclo[5.2.2.0 2,6 ]undec-8-ene-4-yl)propanoic acid was synthesized from easily accessible starting material, 4-oxatricyclo[5.2.2.0 2,6 ]undec-8-ene-3,5-dione. Chemical reactivity of the title was investigated. In particular, it was converted into the corresponding acyl chloride and simple amides. Curtius rearrangement of the acyl azide delivered an isocyanate, which was then transformed into a series of polycyclic ureas. Noteworthy, the thermal rearrangement of the azide underwent without interference from the strained double bond present in the parent compound.
{"title":"Synthesis and some reactions of 2-(3,5-dioxo-4-azatricyclo[5.2.2.02,6]undec-8-ene-4-yl)propanoic acid","authors":"Tatyana S. Оkovytaya, I. Tarabara","doi":"10.15421/081305","DOIUrl":"https://doi.org/10.15421/081305","url":null,"abstract":"Novel 2-(3,5-dioxo-4-azatricyclo[5.2.2.0 2,6 ]undec-8-ene-4-yl)propanoic acid was synthesized from easily accessible starting material, 4-oxatricyclo[5.2.2.0 2,6 ]undec-8-ene-3,5-dione. Chemical reactivity of the title was investigated. In particular, it was converted into the corresponding acyl chloride and simple amides. Curtius rearrangement of the acyl azide delivered an isocyanate, which was then transformed into a series of polycyclic ureas. Noteworthy, the thermal rearrangement of the azide underwent without interference from the strained double bond present in the parent compound.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"21 1","pages":"49-54"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67579176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Описано синтез ряду нових амідних та імідних похідних 2-(3,5-діоксо-4-азатрицикло[5.2.1.0 2,6-ендо ]дец-8-єн-4-іл)бутандіової кислоти – продукту конденсації ендикового ангидриду та аспарагінової кислоти. Проведено квантово-хімічне дослідження розподілу електронної густини у ангідриді вище згаданої кислоти, результати якого свідчать про більшу вигідність атаки нуклеофільним реагентом атому Карбона карбонільної групи, яка знаходиться в другому положенні ангідридного циклу. Регіохімічному перебігу реакції амінолізу ангідриду сприяє як зарядовий так і орбітальний фактори. Наведено спектральні параметри отриманих сполук.
{"title":"Особливості амінолізу ангідриду 2-(3,5-діоксо-4-азатрицикло[5.2.1.02,6-ендо]дец-8-єн-4-іл)бутандіової кислоти","authors":"Yaroslav S. Bondarenko","doi":"10.15421/081306","DOIUrl":"https://doi.org/10.15421/081306","url":null,"abstract":"Описано синтез ряду нових амідних та імідних похідних 2-(3,5-діоксо-4-азатрицикло[5.2.1.0 2,6-ендо ]дец-8-єн-4-іл)бутандіової кислоти – продукту конденсації ендикового ангидриду та аспарагінової кислоти. Проведено квантово-хімічне дослідження розподілу електронної густини у ангідриді вище згаданої кислоти, результати якого свідчать про більшу вигідність атаки нуклеофільним реагентом атому Карбона карбонільної групи, яка знаходиться в другому положенні ангідридного циклу. Регіохімічному перебігу реакції амінолізу ангідриду сприяє як зарядовий так і орбітальний фактори. Наведено спектральні параметри отриманих сполук.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"21 1","pages":"55-60"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67578775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Вперше досліджено вплив різних пластифікаторів на відгук потенціометричних сенсорів на основі полімерів з молекулярними відбитками пропранололу в змішаних неводних середовищах і на коефіцієнт селективності розроблених сенсорів. Пластифікатори (ді-N-октілфталат (ДОФ), дібутилфталат (ДБФ) і діоктілсебацинат (ДОС)) були використані в сенсорах на основі молекулярно-імпринтованих полімерів (МІП) для зміни властивостей полівінілхлоридної мембрани, поліпшення межі виявлення та селективності електродів при потенціометричному визначенні пропранололу. Природа пластифікатора впливає на розподіл МІП часток в полівінілхлоридній плівці, нахил електродної функції, лінійний діапазон і коефіцієнти селективності пропранолол-селективних сенсорів. Запропоновані сенсори апробовані для визначення пропранололу методом прямої потенціометрії в модельних розчинах і таблетках фармацевтичного препарату.
{"title":"Effect of plasticizer on the characteristics of molecularly imprinted polymer based potentiometric sensor for propranolol","authors":"O. Gurtova, L. Ye, F. Chmilenko","doi":"10.15421/081302","DOIUrl":"https://doi.org/10.15421/081302","url":null,"abstract":"Вперше досліджено вплив різних пластифікаторів на відгук потенціометричних сенсорів на основі полімерів з молекулярними відбитками пропранололу в змішаних неводних середовищах і на коефіцієнт селективності розроблених сенсорів. Пластифікатори (ді-N-октілфталат (ДОФ), дібутилфталат (ДБФ) і діоктілсебацинат (ДОС)) були використані в сенсорах на основі молекулярно-імпринтованих полімерів (МІП) для зміни властивостей полівінілхлоридної мембрани, поліпшення межі виявлення та селективності електродів при потенціометричному визначенні пропранололу. Природа пластифікатора впливає на розподіл МІП часток в полівінілхлоридній плівці, нахил електродної функції, лінійний діапазон і коефіцієнти селективності пропранолол-селективних сенсорів. Запропоновані сенсори апробовані для визначення пропранололу методом прямої потенціометрії в модельних розчинах і таблетках фармацевтичного препарату.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"21 1","pages":"20-34"},"PeriodicalIF":0.0,"publicationDate":"2014-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67578554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Viktor F. Vargalyuk, V. V. Poltavets, Helen V. Gruzdeva
{"title":"Вплив температури на електроосадження оксидiв мангану на платиновому та сталевому електродах","authors":"Viktor F. Vargalyuk, V. V. Poltavets, Helen V. Gruzdeva","doi":"10.15421/081309","DOIUrl":"https://doi.org/10.15421/081309","url":null,"abstract":"","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67579118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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