Comparison with the adsorption properties of Florisil. Chromatographia 43, 405-412 (1996). Examination of the retention behavior of positional isomers and polyaromatic hydrocarbons on mixed silica - magnesia layers with various binary eluents. Investigation of the influence of magnesia content in mixed adsorbents and concentration of polar modifier in the eluent on retention. Comparison of the results with those obtained on Florisil using the same eluent by RM correlation. Comparison of chemical character and distribution of active centers on Florisil and mixed adsorbent surfaces by analysis of the structural effects of solutes and the position of points on RM correlation diagrams.

J. Planar Chromatogr. 11, 283-294 (1998). Examination of the retention of different groups of model substances - 16 phenols, 12 amines, 6 quinoline bases - on polar adsorbents - silica gel, alumina, and Florisil - developed with isoeluotropic eluents. The DRM (Dlogk, selectivity) parameters for different substituents of the compounds were compared as parameters of the energies of adsorption of the various chromatographic systems. The DRM values for substituents were correlated with their reactivity constants.

Sz. Nyiredy, A. Kakuk (eds.): Planar Chromatography 2000, Lillafüred, Hungary, 24-26 June 2000, Res. Inst. for Med. Plants, p. 183-193. The retention behavior of 7 monotetrazolium and 9 ditetrazolium salts were studied by spectral mapping technique. Tetrahydrofuran has the highest solvent strength while the differences among ethanol, 1-propanol, 2-propanol and dioxane were relatively low. The selectivity of tetrahydrofuran was different from those of others. Hydrophobicity and electronic parameters were equally involved in the retention strength and selectivity indicating the mixed character of their interaction with the alumina stationary phase and impregnated one.

J. Planar Chromatogr. B, 152-159 (2001). Review of the use of topological indices based on the adjacency and distance matrixes to predict the Rf and RM values, and the physicochemical properties of a variety of groups of organic compounds investigated by TLC. (131 references).

J. Planar Chromatogr. 17, 233-237 (2004). TLC of biogenic amines (dopamine, adrenaline, noradrenaline, 3-methoxytyramine, methanephrine, normethanephrine, vanillylmandelic acid, homovanillic acid, 3,4-dihdroxyphenylacetic acid, 3,4-dihydroxyphenylethyleneglycol, 3-methoxy-4-hydroxyphenylethyleneglycol) and methylxanthines (1-methylxanthine, 7-methylxanthine, theophylline, paraxanthine, theobromine, caffeine) on silica gel with mobile phases comprising a non-polar or weakly polar diluent (chloroform, heptane, or hexane) and a polar modifier (tetrahydrofurane, dioxane, acetone, or ethyl acetate). Examination under UV light or detection with a solution of iron(III) chloride (5 g) and iodine (2 g) in 50 mL of 20 % aqueous tartaric acid. Relationship between Rf values and mobile phase composition was investigated.

J. Chromatogr. Sci. 52 (9), 1095-1103 (2014). Investigation of the retention behavior for a series of amine neurotransmitters, their precursors, metabolites and structurally related drugs on RP-18, RP-8, RP-2, cyano and diol phases with mixtures of phosphate buffer and methanol. According to the computed lipophilicity of the neutral form of the investigated compounds the most lipophilic compound is dobutamine (log PN = 3.78), while the least lipophilic is norepinephrine (log PN = -0.14). Dobutamine was the most lipophilic compound on RP-18 (RM0 = 1.58) and CN phase (RM = 1.21). Norepinephrine on RP-8 phase was the least lipophilic one (RM0 = -0.70). A similar chromatographic behavior could be assumed for RP-18, RP-8 and cyano phases. The mean of the RM values and PC1/RM (scores of the first principal component) experimental lipophilicity indices showed a high correlation with the computed ones.

Chromatographia 27, 297-300, (1989). Study of the effects of acidity of the media on the adsorption of phenol and cresols. Investigation with TLC on silica, silica containing 3% of active carbon and silica containing 6% of active carbon with various solvent systems, using Rf values as a measure of the adsorption content of the solvent mixture on the adsoption of phenol and cresols on the active carbon layer.

J. Planar Chromatogr. 3, 417-421 (1990). Retention versus eluent composition relationships of 36 drugs and poisons have been determined using silica gel and 20 binary eluents - mixtures of four weakly polar diluents (heptane, chloroform, dichloromethane, and trichloroethylene) and four polar modifiers (MEK, ethyl acetate, ether, diisopropyl ether) or mixtures of the four polar modifiers with methanol. In accordance with the Snyder-Soczewinski model of adsorption, linear relationships of the type RM = RM - m log cmod were obtained in almost all cases.