A Century of Separation Science by Haleem J. Issaq

By Haleem J. Issaq

This reference overviews vital advancements in separation technological know-how in view that 1900, and covers contemporary advances and present innovations. Many individuals supply own views on their paintings and the paintings of comrades within the box. a few issues tested contain the advance of chromatography, thin-layer chromatography, the evolution of capillary column gasoline chromatography, and a basic idea of gradient elution. different topics mentioned contain gel permeation chromatography, box movement fractionation, good section microextraction, and a background of the use and size of affinity interactions in electrophoresis. Issaq is a scientist within the Analytical Chemistry Laboratory and supervisor of the Separation know-how crew at SAIC Frederick, NCI-Frederick melanoma study and improvement middle.

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One of the ideas I found very useful was the addition of long-chain quaternary ammonium salts, as suggested by Metcalfe and Martin [4] (their material became commercially available under the name Gas-Quat). Indeed, adsorption of compounds like amines was significantly reduced, but results were inconsistent; for example, a new batch of stainless steel could show inferior behavior. It became obvious that column materials other than stainless steel had to be utilized, and glass was clearly the most interesting material.

Small’’ as well as large inventions have been vitally important. However, some work should perhaps be highlighted. Gerhard Schomburg should be remembered for many efforts, particularly for development of two-dimensional techniques [13–16]. Likewise, the Eindhoven group (Carel Cramers, Jaques Rijks, and coworkers) made numerous contributions to the field; particularly important was their work on narrow-bore, high-speed GC [17–20]. Also, the whisker columns of Victor Pretorius should be mentioned [21,22], which in our hands was the only method for keeping a stable layer of very polar stationary phases.

17]: Several milliliters of the resulting solution were passed through an insulin column. The out flowing liquid was first colorless and then yellow, containing much fatty matter. Pure naphtha was passed through the column for a long time until the out flowing liquid stopped being yellow, but gave a transparent fatty spot on silk paper after drying out. Then, naphtha with the addition of ethanol was allowed to flow through the filter. A light yellow solution began to flow out, and the dry residue from this turned out to be a waxy substance exhibiting double refraction, swelling in water and becoming liquid in a concentrated aqueous solution of resorcinol; that is, showing properties characteristic of lecithin.

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