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Ternary mobile phases in adsorption in thin-layer chromatography

✍ Scribed by Andrzej Waksmundzki; Jan K. Róźylo

Publisher
Elsevier Science
Year
1970
Tongue
English
Weight
324 KB
Volume
49
Category
Article
ISSN
1873-3778

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✦ Synopsis

Ternary mobile phases in adsorption thin-layer chromatography *' In thin-layer chromatography multi-component solvent systems are generally used as mobile phases due to their adsorptive capacity for the substances being separated. Establishing an optimal chromatography system and the separation of substances is easiest if mono-or di-component solvent systems are used. The results of investigations for both systems can be easily presented on simple diagrams, Z.C. chromatographic spectra or curves giving the relationship RI,-= f(composition of the solvent)1-8.

The task is much more difficult with three-component solvent systems; few reports have so far dealt with this problem. They have mostly shown the relationship RI,-= f(tbe composition of a three-component solvent system) on spatial diagrams". However, diagrams of this type serve only theoretical considerations and have never been used in analytical practice. A lack of general rules does not make the choice of solvents for the system easy.

The aim of the present paper is to study the behaviour of some substances of different chemical structure during chromatograpliy in three-component solvent systems, in addition to find an easy way of choosing optimal three-component solvent systems and presenting them on diagrams which would be available for practical use.

Investigations were carried out by ascending TLC, using silica gel (Merck) as adsorbent. Layers of the adsorbent, 0.3 mm thick, were heated for 2 11 at 135". The following components were used as model substances: quinoline (class I3 according to

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