Abstract: A chromatographic column for simultaneous purification of several compounds in a sample by dry column chromatography comprised by a plastic tube and containing a sorbent is described, wherein there is an empty volume on top of the sorbent large enough to hold the amount of developing solvent needed to develop the column, wherein the plastic material is transparent or semitransparent to UV and visible light and can be cut with a sharp object, and wherein the sorbent particle size is <40&mgr; and contains a fluorescent material.

Abstract: A process for separating lipophilic compounds from other lipophilic compounds and a kit therefore are described, said process comprises the steps of:a) providing a mixture of the lipophilic compounds;b) providing urea dissolved in an inert solvent or solvent mixture in which said lipophilic compounds are at most only slightly soluble;c) contacting the mixture of lipophilic compounds with the urea, whereby said urea complex forming lipophilic compounds form complexes with the urea,d) separating the whole mixture into a two-phase mixture with lipophilic compounds forming a first phase and the solvent or solvent mixture forming a second phase, where the complexes formed are present as solids in the second phase, and the lipophilic compounds, which have not been complexed with urea, are present in the first phase,e) separating, and optionally purifying, the first phase from the second phase;f) heating the second phase to break the complexes and release the lipophilic compounds, thereby forming a two-phase mixture