New versions of circular thin-layer chromatography on plates with a closed sorption layer

New versions of circular thin-layer chromatography (corner TLC and lateral TLC) with a closed sorption layer are proposed, studied, and compared with traditional methods of linear and circular TLC. The use of a closed sorption layer in the new versions of circular chromatography is demonstrated to reduce the duration of separation (by 15–20%) while lowering the efficiency of separation negligibly. The feasibility of TLC with a closed sorption layer is demonstrated for the determination of highly volatile compounds.