Half-Way Development - The Technique and the Device

A new horizontal sandwich chamberis described in this paper. Mobile phase can be applied to any part of the plate by use of this chamber. This has enabled a new mode of development in TLC, in which the starting position of development can be anywhere instead of at the origin; we therefore call this new mode 'half-way development'. Compared with traditional development, the new mode can be used to develop any separated spot again. Many other modes of development can also be performed with this chamber, for example relay development on an over-length plate, programmed multiple development, gradient development, band application, concentration, and micropreparative separation. These methods are simple and convenient and give good results. Mixtures of dyes have been used to verify above supposition with the above-mentioned methods. The results obtained are satisfactory. Application of a Mixed Adsorbent for Flow TLC Alexandre M. Worontsov, Alexei B. Markov, and Victor G. Berezkin*