title: The ring-air technique: An alternative to the ring-oven technique in circular thin-layer chromatography.
abstract: A technique is described in which a ring of air is used to produce sample concentration by solvent evaporation on high-performance thin-layer chromatography plates. The technique is compared to the ring-oven technique and both are evaluated by using a dye mixture. Both techniques are employed to reduce the size of relatively large spots on the plates in an attempt to match the resolution obtained from small spots in circular chromatography.
authors.affiliation: Institute for Chromatography, University of Pretoria, Pretoria, South Africa.
authors.forename: R D
authors.initials: RD
authors.lastname: Davies
authors.forename: V
authors.initials: V
authors.lastname: Pretorius