J. Liq. Chromatogr. Relat. Technol. 37, 2892-2914 (2014). Study of the background mass signals derived from different solvents either used for prewashing or chromatography that may interfere in HPTLC-MS using the elution head-based TLC-MS Interface. Pre-washing of plates with methanol – water 3:1 reduced background signals to a minimum, but also special plates for MS are suited (plates of specified MS quality). The results showed that acidic solvents can cause intense background signals due to acid adduct cluster formations. The fluorescence indicator did not impact the mass spectra. It was shown that subtraction of background spectra (at a comparable migration distance) from the analyte mass spectrum is a helpful tool, especially in the case of cluster formation. Recommendations for general plate handling for use in TLC/HPTLC-MS were provided.

Comparison between high-performance liquid and thin-layer chromatography. J. Chromatogr. 447, 404-409 (1988). TLC of benzodiazepines on octadecyl-bonded silica with mixtures of acetonitrile-phosphate buffer in concentration range 30-65% and methanol-phosphate buffer in 55-90% range. Measurement of RM values. Discussion of the range of lipophilicity of compounds interacting with BDE receptors. Comparison between TLC and HPTLC.

J. Planar Chromatogr. 3, 317-321 (1990). A computer program has been developed which can be used to select optimal solvent systems (i.e. diluent, modifier and concentration of the latter) for the chromatographic analysis of a given set of compounds.

J. Planar Chromatogr. 6, 438-445 (1993). Multiple development in TLC provides a straightforward means of improving the separation capacity obtained by normal development. Maximum separation power in isocratic multiple development is obtained when the distance between the solvent entry position and the sample application position is minimized and when the solvent entry position and the solvent front are incremented at each development step. Concerning the resolution the solvent selectivity is the most important parameter. A further advantage of multiple development methods is the ease of automation and the possibility of incorporating solvent gradients into the separation strategy.

J. Planar Chromatogr. 9, 92-97 (1996). Investigation of mixed (adsorption - partition) retention mechanisms on normal phase cyano, amino, and diol stationary phases with binary alcohol - n-aliphatic hydrocarbon eluents. The impact of the nature of the chemically bonded ligand and of the qualitative composition of the mixed mobile phase on the relative amounts of adsorption and partition has been clearly demonstrated for a selection of test solutes.

J. Chromatogr. Sci 37, 41-44 (1999). Determination of Rf values of 25 2-cyclo-3-methyl-thio-3-substituted amine-acrylates on RP-18 with methanol - water mixtures. Establishment of the relationship between Rm value and partition coefficients. Evaluation of the lipophilicity of the compounds using the Rmo value.

J. Planar Chromatogr. 15, 177-182 (2002). HPTLC of 12 fatty acids, hydroxy fatty acids and methyl esters (oleic acid, elaidic acid, palmitic acid, stearic acid, ricinoleic acid, methyl ricinoleate, a-hydroxypalmitic acid, methyl a-hydroxypalmitate, 12-hydroxystearic acid, methyl 12-hydroxystearate, 9,10-dihydroxystearic acid, methyl 9,10-dihydroxystearate) on RP-18 with methanol and methanol - water 19:1 and 9:1. previously saturated for 30 min. Visualization by exposure to iodine vapor. The most accurate prediction of the RM values of the acids and esters, for all the mobile phases investigated, was achieved by use of four-parameter equations relating the dipole moments of the mobile phases to three other parameters.

J. Liq. Chromatogr. Relat. Technol. 28, 907-922 (2005). HPTLC of eight pairs of ortho and para substituted phenols and anilines on amino, diol, and cyano phase, with chamber saturation for 15 min, with nonaqueous eluents consisting of n-heptane and polar modifier (tetrahydrofuran, ethyl acetate, or 2-propanol), or on cyano phase in RP systems with aqueous solutions of methanol or acetonitrile. Evaluation under UV 254 nm.