Acta Chromatographica 22 (2), 267-279 (2010), DOI:10.1556/AChrom.22.2010.2.9. Presentation of a general equation for modeling retention, using the organic modifier content of the mobile phase, which is based on the Box-Cox transform of modifier concentration. Both the semilogarithmic relationship (Soczewinski-Wachtmeister equation) and logarithmic relationship (Snyder-Soczewinski equation) are found to be special cases of the proposed equation. The equation can be fitted easily with free software and an additional coefficient can be interpreted as closeness to the previous models. The equation enables extrapolation to zero modifier content even with strong closeness to log-log dependence. Discussion of a case study on nine drug-like substances, with comparison of 14 previously proposed retention equations found in the literature.

Analyt. Chemistry 54, 1955-1959 (1982). A method is described for predicting the optimum combination of solvent path length and binary solvent composition for obtaining a given separation between a pair of compounds in the minimum time by continuous development TLC. The continuous development of a pair of dyes and a pair of steroids is presented to illustrate the agreement between predicted and experimental analysis time and spot separation.

J. Chromatogr. 270, 87-96 (1984). The influence of mobile phase composition on lipophilicities determined by reversed phase TLC has been investigated by measurement of RM values of homologous n-alkyl phenyl ketones (methyl-to n-heptyl-, n-decyl- and n-undecylketone) using liquid paraffin as the stationary phase and aq. mixtures of acetone, methanol and N,N-dimethylformamide as the eluents.

Budapest Chromatography Symposium June 13, 1985. TLC on starch and cellulose with four solvent systems. a) ethyl acetate - methanol - NH3 5:3:5, b) tert-butanol - MEK - water - NH3 4:3:2:1, c) butanol - acetic acid - water 50:25:25, d) ethyl acetate - acetone - methanol - NH3 2:3:3:2. Identification of aminophylline, azathiopurine, mercaptopurine, thioguanine, xantinolnicotinate and their metabolites: 1-methylxantine, 1, 3-dimethylxantine, 1-methyl uric acid, 1, 3-dimethyl uric acid, thyoxantine, methylthyoguanine.

J. Planar Chromatogr. 4, 127-133 (1991). Comparison of the adsorption properties of Florisil and silica by TLC of aromatic acids and aldehydes in three solvent systems under equilibrated conditions. Discussion of specific differences in adsorption, the influence of polar modifier on the retention, and structural and steric effects of the compounds investigated. These differences enable the choice of the best system for the separation or micropreparative isolation of isomers from natural mixtures.

J. Chromatogr. A 910 (1), 137-145 (2001). Determination of the relative strength of interaction between anionic (SDS) and nonionic surfactant (octaethoxyated oleyl alcohol, GEN) and homologous series of peptides by reversed-phase TLC on alumina layers impregnated with paraffin oil. Correlation of the relative strength of interaction with the physicochemical parameters of peptides, showing the dependence of the relative strength of interaction and the number of amino acid units in the peptides, side chain bulk and electronic properties and hydrophobicity of the amino acids, and the dependence of the impact of individual parameters on the character of surfactant. Discussion of modification of the retention order of peptides by adding different surfactants and surfactant mixture to the mobile phase.

Chromatographia 20, 739-742 (1986). Discussion of the effects of stabilizers such as 2, 6-di-tert-butyl-4-methyl-phenol and hydroquinone and impurities in solvents on the reproducibility of the quantitative analysis (stability tests) of mebeverine by HPTLC.