Acta Chromatographica 1, 81-90 (1992). Introduction of a new thermodynamic definition of the Rf coefficient and furnish of empirical evidence to support it. Concept is the mental division of the multicomponent mobile phases into the individual liquid moieties. Practical example: Solute : methyl undecyl ketone; stationary phases : RP-2, RP-8, RP-18; mobile phases : methanol : water, binary mixtures in varying proportions.

A linear free energy relationship analysis. J. Chromatogr. A 749, 201-209 (1996). Presentation of a linear free energy relationship to analyze the RMw values determined on RP-18 silica with aqueous methanol mobile phases and give a equation, involving the solute descriptors such as excess molar refraction, dipolarity/polarizability overall or effective hydrogen-bond acidity and basicity, and McGowan characteristic volume etc. Comparison of the coefficients in the equation with those for the correlation of water - octanol partition coefficients. Discussion of the limitation of the equation in its application.

J. Planar Chromatogr. 12, 446-451 (1999). Determination of the lipophilicity and the specific hydrophobic surface area of seven monotetrazolium and nine ditetrazolium salts by RP TLC with ethanol, THF and dioxane as organic modifiers. The nature of the organic modifier significantly influenced the specific hydrophobic surface area. TLC of tetrazolium salts on alumina, also on alumina impregnated by overnight predevelopment in n-hexane - paraffin oil 19:1. After drying visualization under UV and under visible light.

Proc. Intern. Symp. on Planar Separations Plan. Chrom. 13-23 (2003). TLC of newly synthesized benzanilides, benzamide and a group of pesticides on RP-18 with aqueous solutions of acetonitrile or methanol with different organic modifier concentrations. Visualization under UV 254 or 366 nm.

J. Planar Chromatogr. 3, 326-330 (1990). Optimization of mobile phase composition for the separation of phenylurea and s-triazine herbicides on silica by means of the „ELUO“ method in which solvents are selected from an eluotropic series based on solvent power. The method is complementary to the „PRISMA“ method for optimizing the compositions of binary, ternary and quaternary mobile phases for OPLC, or even HPLC and HPTLC. TLC of 13 herbicides on silica with five different binary solvent systems.

J. Planar Chromatogr. 6, 144-146 (1993). Investigation of a computer assisted retardation factor prediction system (RFPS) for 15 O-ethyl-O-aryl-N-isopropyl phosphoroamidothioates in HPTLC. The system is based on the use of 4 physico-chemical parameters: hydrophobicity, electric affect, field effect, and steric effect, all of which have a significant influence on HPTLC retention mechanism. The system has been evaluated by comparison of measured retardation factors with those predicted data and experimental results.

J. Planar Chromatogr. 9, 192-196 (1996). Optimization procedures in TLC require unambiguous goals, and optimization criteria express such goals in mathematical terms. If the retardation factor, Rf, varies as a function of the parameters to be optimized criteria should be selected that enable simultaneous optimization of retention and selectivity. It is demonstrated that the result of an optimization process depends on the optimization criterion selected. Substances chromatographed: Metalaxy, pyridaphenthion, trademefon, thiobencarb on HPTLC silica with hexane - ethyl acetate in different compositions.

J. Planar Chromatogr. 13, 88-92 (2000). TLC of cephalosporins (cephalexine, cefaclor, ceftriaxone, cefixime, cefotaxime) on silica gel developed with a variety of binary mobile phases containing different amounts of organic modifier. The influence of type, chemical character, and position of the substitution of functional groups (steric and structural effects) on the retention was of particular interest.