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Capillary Electrophoresis - Methods and Potentials (Paperback, 1996 ed.)
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Capillary Electrophoresis - Methods and Potentials (Paperback, 1996 ed.)
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Capillary electrophoresis (CE), also designated by the acronym HPCE
for "High Per- formance Capillary Electrophoresis" is a rapidly
growing analytical separation method. It unites the separation
technique of classical electrophoresis on plates with the
instrumental methods of chromatography with respect to direct
detection of the solutes separated in the capillary and their ready
identification and quantification. The initial problems of
inadequate reproducibility in quantitative analysis, due to the
necessity of handling extremely small volumes, have largely been
solved in the sec- ond generation commercial instruments. Hence, a
rapid and reliable separation sys- tem is available for ionic
compounds from the smallest cation (the lithium ion) up to poly
anions with molecular weights ranging in the millions (such as DNA
molecules). The methods of gel electrophoresis and isoelectric
focusing can be readily extended to separation techniques carried
out in a capillary. For nonionic compounds an addi- tional
separation method is available in the form of micellar
electrokinetic chroma- tography (MEKC). This involves a true
chromatographic separation process because the distribution of the
analytes between the buffer and the micelles is superimposed on the
electrophoretic migration, which contributes substantially to the
selectivity.
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