RM and log P values. J. Chromatogr. 498, 179-190 (1990). Measurement of the RM values of a series of xanthine and adenosine derivatives on silicone-impregnated silica and C-18 silica with aqueous glycine buffers (pH 9.0) or sodium acetate veronal buffer (pH 7.0), alone or mixed with various amounts of acetone. Correlation of the two series of data obtained. Comparison of experimental log p values with calculated ones. The TLC data proved to be reliable for describing the lipophilic properties of the test compounds.

J. Planar Chromatogr. 5, 50-56 (1992). Calculation of the mean pore size and the pore size distribution using the approximate methods developed by Halasz and Knox after determination of the cumulative pore volume distribution curve for precoated silica gel TLC and HPTLC plates. Results agree reasonably with the values specified by the manufacturers. (No evidence that the presence of a binder in the layer structure adversely affected the pore size distribution.) Simple method for the determination of basic physico-chemical values.

Influence of the organic modifier on the slope of the thin-layer chromatographic equation. J. Chromatogr. 669, 246-253 (1994). Determination of the RM values of a series of steroids. Investigation of the influence of the organic solvent in the mobile phase on the slopes of the TLC equations. Analysis of the equation correlating slopes and intercepts in different solvent systems. Proposal of a TLC method to be considered as a general procedure for the determination of lipophilicity.

Proc. 9th Internat. Symp. Instr. Chromatogr., Interlaken, April 9.-11., 179-186 (1997). In chromatographic systems containing weak monocomponent mobile phases and polycyclic hydrocarbons as solutes on silica no differences between retention parameters and analysis time were observed. In the case of aluminium oxide as stationary phase the electric field evidently influenced the chromatographic parameters of non-active solutes and the migration velocity of solvents.

J. Planar Chromatogr. 13, 149-151 (2000). TLC of polystyrene of average molecular weights of 117, 240 and 460 kDa on silica gel by one-dimensional single development in an N-type unsaturated chamber with cyclohexane - toluene - methyl ethyl ketone or cyclohexane - toluene. Details and detection as described in J. Planar Chromatogr. 11, 114-118 (1998).

J. Liq. Chrom. Rel. Technol. 27, 2019-2030 (2004). Comparison of the N-type and S-type chambers in terms of mobile phase flow rate, the Rf values obtained, and the densitometrically established concentration profiles of the test analytes. Selected were several phenyl-substituted alcohols and acids, low activity adsorbents (e. g. cellulose powder), and low-polarity solvents (n-octane and decalin) as the components of the chromatographic systems investigated. The overall conclusion from the results obtained is that the physico-chemical performance of the S-chamber is comparable with that of the N-chamber, and that the only indisputable superiority of the S-chamber is the more economical use of the mobile phase.

J. Liq. Chromatogr. Relat. Technol. 38, 1113-1120 (2015). HPTLC of orbifloxacin (1), danofloxacin (2), ciprofloxacin (3), norfloxacin (4), enrofloxacin (5), marbofloxacin (6), difloxacin (7) and ofloxacin (8) on silica gel with 1,4-dioxane - ammonia - tetrahydrofuran 6:3:2. Quantitative determination by absorbance measurement at 320 nm. The hRF value was 19 for (4), 23 for (3), 30 for (2), 37 for (8), 40 for (6), 44 for (5), 56 for (1) and 59 for (7). Linearity was in the range of 159-513 ng/zone for (1), 99-238 ng/zone for (2), 97-244 ng/zone for (3), 69-163 ng/zone for (4), 63-170 ng/zone for (5), 103-250 ng/zone for (6), 84-251 ng/zone for (7) and 94-260 ng/zone for (8). LOD and LOQ were 53 and 159 ng/zone for (1), 32 and 98 ng/zone for (2), 32 and 97 ng/zone for (3), 23 and 69 ng/zone for (4), 21 and 63 ng/zone for (5), 34 and 103 ng/zone for (6), 28 and 84 ng/zone for (7) and 31 and 94 ng/zone for (8), respectively. Selection of appropriate viscosity of the mobile phase may be important in obtaining optimal chromatographic separation.

J. Planar Chromatogr. 3, 521-526 (1990). HPTLC of estrone, equilin, equilenin and their 17a-diols on silica with cyclohexane - chloroform - methanol - triethylamine 16:18:2:3 and, after drying, chloroform - dioxan - triethylamine 40:3:2 (same direction). Mestranol was used as internal standard and densitometric measurement was made in the reflectance mode at 282 nm. Also study of the relationship between structure and retention.