This review is in support of the development of selective, reproducible and validated capillary electrophoretis (CE) methods. Focusing on pharmaceutical and biological applications, the successful use of CE is demonstrated by more than 800 references, mainly from 1994 until 1998. Approximately 80 recent reviews have been catalogued. These articles sum up the existing strategies for method development in CE, especially in the search for generally accepted concepts, but also looking for new, promising reagents and ideas. General strategies for method development were derived not only with regard to selectivity and efficiency, but also with regard to precision, short analysis time, limit of detection, sample pretreatment requirements and validation. Standard buffer recipes, surfactants used in micellar electrokinetic capillary chromatography (MEKC), chiral selectors, useful buffer additives, polymeric separation media, electroosmotic flow (EOF) modifiers, dynamic and permanent coatings, actions to deal with complex matrices and aspects of validation are collected in 20 tables. Detailed schemes for the development of MEKC methods and chiral separations, for optimizing separation efficiency, means of troubleshooting, and other important information for key decisions during method development are given in 19 diagrams. Method development for peptide and protein separations, possibilities to influence the EOF and how to stabilize it, as well as indirect detection are considered in special sections.

Strategies for capillary electrophoresis: Method development and validation for pharmaceutical and biological applications

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Arguably, the most important parameter in modern liquid chromatography is the hold-up (or dead) volume, VM, the volume of mobile phase contained within the chromatographic system between the sample injector and the detector. Without this knowledge many dependent parameters such as capacity factor (k), selectivity (α), and resolution (Rg) cannot be computed (104, 15, 78). These data are of the utmost importance for the optimization of conditions for the separation of complex mixtures and the identification of solute bands.

A review of methods for the determination of hold-up volume in modern liquid chromatography

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A review of methods for the determination of hold-up volume in modern liquid chromatography