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.

CBS 92, 10-12 (2004). Conversion of AMD1 gradients into AMD2 gradients with a mathematical system using Excel 97.

J. Planar Chromatogr. 22, 313-319 (2009). Presentation of two different methods of three-dimensional TLC using plates with open and sealed (closed) adsorption layers. In the suggested method the components of the test dye mixture initially migrate in the first direction, then in the second direction (different from the first) and in the third direction (different from first and second). TLC of dye mixture 1 (crystal violet, xylen cyanol, neutral blue, bromothymol dark blue, methanyl yellow, acridine orange, indophenol, ariabel red, Sudan blue II, Sudan IV, dimethylaminoazobenzene) with ethanol - acetic acid 10:1 (1D), acetone (2D), and toluene (3D) and of mixture 2 (dark violet, bright orange, yellow, dark red, violet) on silica gel with tetrahydrofurane - benzene 9:1 (1D), dichloromethane - benzene 3:1 (2D), and toluene (3D).

J. Planar Chromatogr. 27, 299-314 (2014). 2D-HPTLC of 115 toxicological relevant drugs in serum or blood on silica gel with different solvent mixtures. Quantitative determination by absorbance measurement at different wavelenghts. The 2D-HPTLC method provided significant qualitative and quantitative improvements related to separation efficiency, comparable with HPLC-DAD, GC-MS and LC-MS.