Dünnschicht-Chromatographie. InCom Sonderband 1996, 124-138. Comparison of six different optimization methods based on the relationship of coupling the retention parameters with the binary mobile phase composition, as proposed by Snyder, Schoenmakers, Lu Peichang and Lu Xaoming, Purnell, Kowalska, and Horvath and Melander.

J. Planar Chromatogr. 12, 365-372 (1999). Development of a computer program for optimization of mobile phase composition in TLC and examination of this method for chromatography of cyanobacterial hepatotoxins on normal-phase TLC plates and for phenolic compounds on RP layers. HPTLC of microcystins (cyclic heptapeptides) on silica gel with combinations of n-propanol - ethyl acetate - water. Densitometry at 240 nm. TLC of phenolic acids (catechin, ellagic acid, gallic acid, kaempferol, methyl gallate, rutin) on RP-18. Videodensitometry at 254 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.

J. Planar Chromatogr. 21, 315-323 (2008). The role of the mobile phase in controlling selectivity for adsorption chromatography - with either thin-layer plates or columns - is reviewed and expanded. The use of different solvent mixtures of varying selectivity in normal-phase chromatography is now on a firm theoretical and practical basis. The choice of a more polar component (B-solvent) of a binary solvent mixture (A/B) largely determines relative retention and resolution. Maximum differences in selectivity are achieved by the use of two mobile phases where the B-solvent is either very polar (requiring a lower % B for desirable values of k) or relatively nonpolar (requiring a higher % B).

J. Planar Chromatogr. 3, 425-528 (1990). It is proposed the RM values of substances analyzed on silica with tertiary mobile phases may be predicted from one-parameter regression equations. Experimental RM values for a group of isomers investigated have been compared with theoretical values calculated both on the basis of the author’s own studies (RMy = f(RMx)), and from Oscik’s theory. Substances chromatographed: o-, m- and p-isomers of aminophenol, ethylphenol, cresol, nitroaniline, nitrophenol, toluidine, chloroaniline, chlorophenol, nitrotoluene, chlorotoluene.