J. China Pharm. Univ. (Zhongguo Yaoke Daxue Xuebao) 19, 62-64 (1988). Micellar TLC of acetylsalicylic acid and chlorpheniramine on silica with mobile phase containing sodium dodecyl sulfate and Tween 80 or ß-cyclodextrin in aqueous solution. Detection under UV.

Labo 21, 7-12 (1990). Description of an additional method for quantification in planar chromatography offering qualified quantitative analysis before, with or instead of HPLC with one or many samples simultaneously. The instrumental requirements can be compared with HPLC.

J. Planar Chromatogr. 3, 199-200 (1990). The distinguishing feature of the new design is that instead of using the distributor as applied by Soczewinski, a shallow eluent reservoir is used; its level is close to the level of the chromatographic plate. Development is started by shifting the chromatographic plate in the direction of the eluent reservoir so that it comes into contact with the eluent on a narrow zone. In the reservoir the eluent forms a vertical meniscus between the bottom and the cover plate which, during development, shifts in the direction of the cover plate; the eluent is exhausted completely, so solvent consumption is minimal. Publication annotated as CBS references 67017 and 67018 are based on the same device.

J. Planar Chromatogr. 5, 221-228 (1992). Study of zone width, zone separation distance, and resolution in unidimensional multiple development TLC for solutes of different Rf, using different numbers of successive developments and different development distances. Zone separation distance and resolution are strongly influenced by the solvent entry position. Experiments were performed with test mixtures of PTH-amino acids, equilenin, 17a- and 17ß-estradiol, estrone, 1-nitronaphthalene, benzo(e)pyrone, fluoranthene, biphenyl.

Part. 1. Planar electrochromatography on non-wetted thin-layers. Chromatographia 38, 83-87 (1994). Description of planar electrochromatographic separations of test dry mixture on non-pre-wetted TLC plates. Studies of the behavior of different layers and solvents in an applied electric field of up to 2000 V cm-1. Evident electrokinetic effects, electromosis and electrophoresis were observed only on silica gel and polyamide layers developed with polar solvents. Reproducibility, within 5%.

Bunseki Kagaku (Jap. Anal. Chem.) (2), 133-135 (1994). A review with 14 references on the optimization of the mobile phase in TLC by Prisma method.

J. Planar Chromatogr. 11, 388-393 (1998). Special development techniques have been used for preparative zonal TLC of closely related compounds (e.g. positional isomers). Improvement of the separation of test mixtures was achieved by use of multiple development and incremental multiple development coupled with stepwise gradient elution. Improved separation resulted from zone preconcentration and as result of mutual displacement effects occurring during chromatography under overloaded conditions. TLC of mixtures of positional isomers on silica gel with a variety of different mobile phases; detection i.a. under UV 254 and 366 nm. Densitometry at 320 nm.

II. TLC on silica of trans- and cis-2-phenethyl-3-(9-methylcarbazol-3-yl)-4-substituted isoquinolines. J. Liq. Chrom. & Rel. Technol. 25, 3131-3140 (2002). TLC of 25 different cis and trans-4-substituted tetrahydroisoquinolines on silica gel. The automatic selection of mobile phase strength was performed by the LSChrom software, incorporating the Snyder theory and data about the adsorption properties of usual structural elements or functional groups. These data enabled the authors to describe any sample structure necessary to do further calculations. Using the same software, 12 mobile phases having the calculated values of epsilon were selected. The experimental Rf values were, in general, in the favorable range, showing proper automatic prediction both of epsilon and the concrete mobile phase for TLC of the 25 compounds.