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  • 1 Shenyang Pharmaceutical University Department of Analytical Chemistry Shenyang 110016 P.R. China
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A new distributor which can be used more perfectly for half-way development is described in this paper. The distributor is made from two microscope slides which are specially treated and glued together like a funnel. The mobile phase can be delivered to the new distributor by means of a syringe; the solution fills the capillary crack immediately and then leaks on to the thin layer plate. Development can then begin at the same starting line. Compared with the old device the distance traveled by the mobile-phase front before it becomes even (which we denote the ‘even distance’) is much lower, so the new device is more suitable for re-chromatography of two close spots. Mixtures of dyes have been used to verify this supposition, with satisfactory results.

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