Isotachophoretic analysis of inorganic ions

Valášková, Iva; Havránek, E

doi:10.1016/s0021-9673(99)00016-3

Cited by 14 publications

(4 citation statements)

References 45 publications

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“…A mixture of 12 REEs was separated within 9-10 h. These works (together with many others, see e.g. [18]) led to the development and establishment of capillary isotachophoresis (ITP) as a powerful analytical separation technique, which was also frequently and successfully utilized in inorganic analysis [19][20][21]. Principles of ITP are used in modern separation schemes especially for a preconcentration of sample ions [8,21,22].…”

Section: Some Historical Factsmentioning

confidence: 99%

Analytical separations of lanthanides and actinides by capillary electrophoresis

Janoš

2003

Electrophoresis

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The separation of lanthanide and actinide elements belongs to one of the most challenging tasks of the separation science, due to a great similarity in their physical and chemical properties. The electrophoretic separation can be accomplished in the presence of suitable complex-forming agents, from which alpha-hydroxyisobutyric acid (HIBA) has been used most often. In the most effective capillary electrophoretic mode--capillary zone electrophoresis (CZE)--a complete separation of lanthanide ions can be accomplished within a few minutes. Various electrophoretic methods can be relatively easily adopted for the determinations of individual lanthanide elements in certain kinds of technical materials, concentrates, precursors, etc., where the high speed and low costs of analysis characteristics of capillary electrophoresis (CE) may be advantageously exploited. Electrophoretic techniques may also be employed for speciation studies, especially for examinations of the behavior of actinides in the environment.

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Section: Some Historical Factsmentioning

confidence: 99%

Analytical separations of lanthanides and actinides by capillary electrophoresis

Janoš

2003

Electrophoresis

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“…The current study analyzed the content of major organic acids by isotachophoresis (ITP) ( Table 3 ). This method is used for electromigration separation and allows the analysis of mixtures of ionic substances [ 33 ]. In the experiment, sample B had the highest content of tartaric, malic and succinic acids, and together with wine A , also citric acid.…”

Section: Resultsmentioning

confidence: 99%

The Content of Selected Bioactive Compounds in Wines Produced from Dehydrated Grapes of the Hybrid Variety ‘Hibernal’ as a Factor Determining the Method of Producing Straw Wines

Kowalczyk

Bieniasz

Kostecka-Gugała

2022

Foods

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Sweet wines are appreciated worldwide; many are produced by fermenting the must of dehydrated (semi-dried) grapes, using methods that vary from region to region. The aim of this study was to evaluate the basic chemical and oenological characteristics of wines obtained by three technologies of production. The wines were made from a hybrid cultivar ‘Hibernal’, grown under cool climate conditions. ‘Hibernal’ is a hybrid variety. This ‘Hibernal’ variety is widely cultivated in central and eastern Europe, where it is of great economic importance. Wines produced from this variety are popular in local markets. In comparison with the production of varieties belonging to Vitis vinifera, a very small percentage of the ‘Hibernal’ variety is cultivated. The methods used in the experiment for the production of wines were: classical method in the Italian passito style, modification of the passito style with a seven-day maceration of grapes, and a method of production in the Tokaj wine style at five Puttonyos. Basic chemical parameters, acid profile, total phenolic content, antioxidant and antiradical capacities, and quantitative analysis of selected polyphenols was performed. The sensory features and quality of the wines was assessed using a sommelier analysis based on The Wine & Spirit Education Trust guidelines. The results indicated that the seven-day maceration of the dehydrated grapes resulted in the highest polyphenol content, as well as the largest antioxidant and antiradical contents. The oenological evaluation of wines produced by the Tokaj method and Italian passito method with seven-day maceration found that the wines were appreciated due to their rich taste, flavor, and overall quality. The present study confirms the promising opportunities to obtain special sweet wine with a valuable composition and oenological characteristics in regions with cooler climates.

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“…Ethanol acts as a suitable medium for the separation of these metals without using any complex forming additives. 32 The only exception is K + which makes a mixed zone with NH 4 + . It could be theoretically determined from the leading zone prolongation but, unfortunately, precision of this procedure was poor.…”

Section: Itp Methods Developmentmentioning

confidence: 99%

A physico-chemical study of the cationic surfactants adsorption on montmorillonite

Praus¹,

Turicová²

2007

J. Braz. Chem. Soc.

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O objetivo deste trabalho é o estudo da adsorção de brometo de cetiltilmetilamônio (CTA) e de cloreto de cetilpiridínio (CP) em argilas do tipo montorilonita (MMT) ricas em sódio. Um método isotacoforético (ITP) específico foi desenvolvido visando à determinação rápida e simultânea dos surfatantes catiônicos (CS) adsorvidos. A fim de reduzir os limites de detecção, o método isotacoforético foi conjugado com a técnica de eletroforese capilar. Para determinar o arranjo dos surfatantes catiônicos (CS) adsorvidos na superfície das argilas foi efetuada a avaliação do balanço molar entre os surfatantes e os cátions metálicos juntamente com as isotermas de adsorção. A maior adsorção do CP comparada a do CTA pode ser entendida não só pela ação das forças eletrostáticas, mas também por outras interações, tais como, interação hidrofóbica cauda-cauda e/ou interações entre anéis piridínicos formando bicamadas incompletas e/ou monocamadas condensadas, respectivamente.The adsorption of cetyltrimethylammonium (CTA) bromide and cetylpyridinium (CP) chloride on Na + -rich montmorillonite (MMT) was studied. An ad hoc isotachophoretic (ITP) method was developed for the simultaneous and rapid determination of the cationic surfactants (CSs) adsorbed. In order to decrease the detection limits, ITP was on-line coupled with capillary zone electrophoresis. Adsorption data were analysed by their fitting with adsorption isotherms. The adsorption of CP is well described by the Langmuir isotherm. It indicates the monolayer arrangement of CP on the MMT surface. In case of the CTA data, the best fitting LangmuirFreundlich model with the power constant r<1 was found. It can be explained by the CTA interactions because of its intercalation into the MMT interlayer space.

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Isotachophoretic analysis of inorganic ions

Cited by 14 publications

References 45 publications

Analytical separations of lanthanides and actinides by capillary electrophoresis

Analytical separations of lanthanides and actinides by capillary electrophoresis

The Content of Selected Bioactive Compounds in Wines Produced from Dehydrated Grapes of the Hybrid Variety ‘Hibernal’ as a Factor Determining the Method of Producing Straw Wines

A physico-chemical study of the cationic surfactants adsorption on montmorillonite

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