Read e-book online Capillary Electrophoresis: Principles and Practice PDF

By Reinhard Kuhn, Sabrina Hoffstetter-Kuhn

ISBN-10: 3540564349

ISBN-13: 9783540564348

Capillary electrophoresis (CE) is a brand-new analytical process with the potential of fixing many analytical separation difficulties very speedy and economically. this technique offers new information regarding the investigated components which can't simply be received by means of different capacity. CE has develop into a longtime approach only in the near past, yet may be applied in virtually each analytical laboratory in undefined, carrier devices and academia within the close to destiny. an important fields of CE program are pharmaceutical and biochemical learn and quality controls. The authors have exhaustive useful adventure within the software of CE tools within the pharmaceutical and supply the reader with a entire therapy of this system. the main target is on the best way to resolve difficulties while utilizing CE within the laboratory. Physico-chemical conception is simply handled extensive while essential to comprehend the underlying separation mechanisms so that it will remedy your difficulties on the analytical bench. An addendum comprises tables at the practise of buffers and steered additional analyzing.

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17 (a) and 18 (b) The addition of organic modifiers such as alcohols or hydrophilic linear polymers also leads to a reduction of EOF (see Sect. 7). As an alternative to the dynamic coating, polymers like polyacrylamide are covalently bound to the silica to eliminate entirely the EOF, with the additional benefit of minimizing the adsorption of proteins to the capillary wall (see Sect. 2). Finally, gelfilled capillaries are another approach to minimize electroosmosis. A detailed description of the different procedures for the control or elimination of EOF by capillary coating can be found in Sect.

2. Characteristic thermal conductances K according to Ref. 21 and 33. d. d. K-l] The thennal conductance of the fused silica is double the conductance of water which means that heat is more effectively conducted across the capillary than through the liquid. Because of this reason the temperature difference per volume will be smaller than within the bore. d. 47 K. 1 K, approximately 1/4 of the temperature difference of the solution. 2. it becomes evident that the efficiency of heat removal is governed by the heat transfer between the outer wall of the tube and the surrounding air, which is the limiting factor, and not by the inside diameter of the capillary.

The temperature is related to the viscosity of the medium according to Eq. 2-12. leo = C . e _ EA RT (3-9) 44 Factors Influencing Performance C is the proportionality constant For the quotient of two EOF mobilities at two different temperatures, it follows: (3-10) Index 1 refers to the measurement at low voltage and 2 to the measurement at running voltage. In aqueous solution EA/R is 1820 K. 5 . 6 K for forced air convection (see below). If, for instance, the voltage is 20 kV and the current 50 ~A, the temperature increase in the capillary is about 11 K.

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Capillary Electrophoresis: Principles and Practice by Reinhard Kuhn, Sabrina Hoffstetter-Kuhn


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