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Elektrochromatografia kapilarna : teoretyczne podstawy i zastosowania

100%

Malinowska I. , Drozdzowski M. , Bojarski J.

Wiadomości Chemiczne

2005

tom [Z] 59, 9-10

771--789

In this article the theoretical basis of capillary electrochromatography are presented, as well as some of its analytical applications. The historical background of this analytical method is briefly outlined. The nature of Helmholtz and Stern double layer at the phase boundary resulting in the electroosmotic flow (EOF) and the equations describing its velocity are shortly discussed. From these equations it follows that EOF depends on the properties of liquid phase (a ratio of dielectric constant to viscosity), the electric field intensity and the electric double layer (ζ potential) but does not depend on the diameter of particles of column or capillary packing. The relationship between EOF and efficiency of the chromatographic system is discussed and some advantages and disadvantages of electrochromatography are mentioned. The columns (capillaries) used in electrochromatography (packed, open tubular and monolytic) are described. The applications of capillary electrochromatography described here encompass enantioselective analysis and separation of mixtures of analytes. The examples of enantioseparations deal mainly with drugs, whereas electrochromatographic separations of mixtures are exemplified by amino acids, peptides, proteins and some groups of drugs (barbiturates and benzodiazepines). It is concluded that electrochromatography, although relatively "young" analytical method, found important applications and is in the phase of constant development.

Dwuwymiarowa separacja technikami chromatografii i elektroforezy ze szczególnym uwzględnieniem połączenia ich w proces jednoetapowy

84%

Łopaciuk E. , Dzido T. H.

Wiadomości Chemiczne

2013

tom [Z] 67, 9-10

899--927

Liquid chromatography and electrophoresis techniques are very often applied in contemporary laboratory practice. These techniques usually show different separation selectivity. It is due to various separation mechanisms involved in these two modes. In the former, partition of solutes between stationary and mobile phases influences on separation selectivity and retention contrary to the latter in which electrophoretic effect is involved in separation mechanism. The features mentioned are very useful for combination of these two techniques into two-dimensional separation of complicated samples of biomedical and environmental origin. Development of such approach is a very promising for contemporary separation sciences. The paper presents an overview of two-dimensional separation techniques, in which both liquid chromatography and electrophoresis have been involved especially in continuous mode.

Chromatoelektroforeza aminokwasów

67%

Podeszewski Z.

Roczniki Państwowego Zakładu Higieny

1962

tom 13

nr 1

Przeglad metod chromatograficznych stosowanych w analizie aminokwasow

59%

Orkusz A.

Żywność Nauka Technologia Jakość. Suplement

2000

tom 07

nr 3

14-21

Celem artykułu jest przegląd metod chromatograficznych stosowanych w analizie aminokwasów (chromatografia bibułowa i cienkowarstwowa, elektrochromatografia, chromatografia gazowa, cieczowa - kolumnowa, wysokosprawna chromatografia cieczowa). Szczegółowo omówiona zostanie metoda z zastosowaniem HPLC chromatografu AminoQuant 1090 seria II z detektorem UV-Vis (DAD) firmy Hewlett Packard.

The review of the chromatographic methods (paper, thin-layer, electrochromatography, gas, liquid - column and high pressure liquid chromatography) used for the analysis of amino acids in the paper is presented. The method with using of the Hewlett Packard's HPLC Chromatograph AminoQuant 1090 series II with a diode array detector is especially exhibited.