Chromatography and Electrochromatography

Requirements for Analysis by Differerntial Migration

“…The geometry of the sorbent may also be varied. Examples of this kind of variation are the dimensions of the tubes and columns in gas and solution chromatography, and the variation of paper from strips to sheets in paper chromatography, two-way paper chromatography, and radial paper chromatography (1,(4)(5)(6)(7).…”

“…These differential migration methods are very simple in principle, but they are endlessly variable with respect to modification and application. Consequently there have been few attempts to systematize the basic principles and the requisite conditions (1)(2)(3)(4)(5)(6)(7)(8). This paper describes the important features that are common to all differential mi-gration methods of analysis.…”

Apparatus for Continuous Electrochromatography

“…The continuous resolution of mixtures of solutes by electrical migration transverse to flow of a suitable electrolytic solution in a stabilizing medium was described independently and virtually simultaneously by Durrum (2), Grassmann (3), Svensson and Brattsten (IS), and Strain (10). Many modifications of this continuous electrochromatographic (zone electrophoresis) technique and most of the applications have been cited in books (1,5,6,14) and reviews (7,11).…”

“…A primary requirement for continuous electrochromatography is uniform flow of the background electrolytic solution or wash liquid. This has usually been achieved by the use of porous beds of packed powders (13) or of sheets or pads of filter paper (2,3,7,9,11,12). As uniform flow through porous beds is difficult to control, most modifications have employed filter paper.…”

Chromatography of Organic Acidic Compounds on Multibuffed Paper

“…rT^HE literature of paper chromatog-X raphy, including paper chromatography of acidic compounds, has been covered by Block, Durrum, and Zweig (1), Lederer (4), Turba (10), and Hais and Macek (3). The most recent developments were reviewed by Strain and Sato (9).…”