J. AOAC Int. 82, 38-47 (1999). Description of a 2-day program with 9 exercises in TLC in order to teach the basics of the technique including the preparation of written reports. The exercise consisted i.a. of the study of the influence of several factors on chromatographic behavior (e.g. sorbent type, layer thickness, particle size and distribution, chamber saturation, 2-dimensional TLC, HPTLC); visualization techniques, and discussion of the results. Substances chromatographed, e.g. benzodiazepines, sulfonamides.

- Part 1. Fundamentals of systematic quantitative errors. J. Planar Chromatogr. 18, 51-56 (2005). First part of a series covering systematic errors arising in separation systems, evaluation and calibration errors, nonlinear separation and quantitation techniques, the sf4-procedure for finding total systematic errors, systematic errors caused by regulations, and conclusions and proposals for quantitative planar liquid chromatography (PLC). 1) Nonsystematic errors: 1.1 Finding systematic errors hidden in nonsystematic errors, 1.2 Are random errors unstable? 1.3 Errors caused by (false) statements. 2) The main sources of systematic errors in quantitative PLC: 2.1 Chromatography, 2.2 Physics (baseline - baseplane; practical example). 2.3 Mathematics (detectability limit of the systematic error and the standard certainty STC). 3) Sampling chromatography.

Chromatographia 18, 249-252 (1984). TLC of 25 steroids on silica with ethyl acetate1,1,2-trichlorotrifluoroethane, in various proportions. Detection by spraying with 10 % aqueous sulfuric acid. Discussion of the relationship of binary solvent systems used in continuous development TLC.

J. Planar Chromatogr. 3, 73-76 (1990). Construction of an equilibrium simulation model to describe the chromatographic properties of chelates and reagents, dissociation of silanol groups and reagents, step dissociation of complexes, exchange of chelate metal for the hydrogen atom of silanol groups, and solvent adsorption on adsorption centers. This model facilitates an adequate description of the dependence of chelate and reagent Rf values on their concentration in the sorbent layer.

Part 1: The characteristics of the initial, non-equilibrium stage of the chromatographic separation. J. Planar Chromatogr. 8, 430-438 (1995). Investigation of the factors which influence the progress of a chromatographic separation. Profiting from the properties of a liquid-crystalline detector, distributions of spot concentration at the origin, and the disturbance of these distributions during the initial, nonequilibrium stages of chromatogram development, have been displayed as three-dimensional images. The influence on the shapes of these images of the concentration of the solution investigated, the polarity of the solvent used to dissolve the sample, the volume applied, and the type of sorbent have been determined.

J. Planar Chromatogr. 20, 251-257 (2007). TLC with aqueous ammonia-organic modifier (acetonitrile, dioxane, acetone) mobile phases has been used to study the effect on retention of the chromatographic system and the physicochemical properties of twelve 2,4-dioxotetrahydro-1,3-thiazoles. Principal-component analysis and partial least-squares regression were used to determine the molecular properties with the greatest effect on retention for each modifier. Good correlation was obtained between experimental and calculated retention data. HPTLC on RP-18 without chamber saturation. Detection under UV 254 nm.

J. Planar Chromatogr. 26, 153-159 (2013). TLC lipophilicities of 21 newly synthesized 1,2,4-triazoles on RP-8 and RP-18 with buffered solutions of acetone, 1,4-dioxane, tetrahydrofuran and acetonitrile as well as on cyano phase with solutions of 0.03, 0.04, 0.06, 0.08 and 0.1 M sodium dodecyl sulfate modified with the constant (20 %) addition of organic modifier (acetone, 1,4-dioxane, tetrahydrofuran and acetonitrile). Partitioning lipophilicity indices showed mobile phase composed of sodium dodecyl sulfate and tetrahydrofuran as the system providing the best linear correlations between chromatographic and partitioning lipophilicities of tested 1,2,4-triazoles.

J. AOAC Int. 98, 345-353 (2015). HPTLC of 14 derivatives containing the phenanthrene skeleton on RP, CN and NP phases. Quantitative structure-retention relationship analysis determined that the best conditions to predict log P was RP with acetone–water ranging from 30 to 80 % in 10 % increments of the organic modifier.