Vapor-phase chromatography theoretical plate

During recent years, the problem of optimization of separation techniques in thin-layer chromatography has been tackled in both theoretical treatments (129-133) and in the development of instrumentation (134-136). In overpressured TLC (137) a pressurized ultramicrocham r is used. The essential feature of this chamber system is that, in contrast to the rigid glass plate used in the earlier ultramicrochamber (138,139), the sorbent layer is completely covered by an elastic membrane under external pressure, so that vapor phase above the layer is eliminated. Solvent is admitted into the chamber under overpressure by means of a pump system. This technique essentially combines the... 

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