J. Planar Chromatogr. 5, 323-333 (1992). Discussion of methods commonly used to determine the observed plate height in TLC including problems arising in experimental measurements. At present it seems reasonable to conclude that none of the reported methods provides an adequate description of the average plate height for TLC.

J. Planar Chromatogr. 8, 336 - 340 (1995). Introduction of a new model of solute retention for RPTLC with (B + AB)-type mobile phase. On the basis of theoretical assumptions physico-chemical relationships were derived for solute Rf values in RPTLC with acetonitrile - water, tetrahydrofuran - water, and acetone - water. The practical utility of the model has been demonstrated with abundant experimental results. Excellent agreement was observed between experimental and predicted Rf values for test solutes. - RPTLC of naphthalene, anthracene, phenanthrene, chrysene, and pyrene on RP-18 silica developed with ACN - water, THF - water, and acetone - water mixtures of different ratios.

J. Planar Chromatogr. 11, 383-387 (1998). The lipophilicity and specific hydrophobic surface area of 18 nonsteroidal anti-inflammatory drugs have been determined by RP TLC for subsequent studies of quantitative structure-activity relationships (QSAR). The mobile phases were mixtures of water and methanol containing 59 mM acetic acid, sodium acetate, or sodium chloride. The lipophilicity and specific hydrophobic surface area were calculated from the linear relationship between the actual RM value of the solutes and the concentration of methanol in the mobile phase. RP TLC on silica gel impregnated by overnight development in n-hexane - paraffin oil with water - methanol mixtures; the methanol concentration ranged from 0 to 35% in steps of 5%. The solute spots were revealed by their UV absorbance.

J. Planar Chromatogr. 14, 224-233 (2001). Review of findings on the susceptibility of the organic chemically bonded ligands to hydrolytic cleavage from the silica matrix for the most common TLC-type stationary phases, i.e. RP-18, RP-8, CN and DIOL. This process was induced by repeated (i.e. one-, two-, four-, and eightfold) development of these phases with mixed mobile phases comprising methanol, water, and buffers of different pH. Quantification of the extent of hydrolytic cleavage of the different ligands from the silica gel surface was basically achieved by means of Raman spectroscopy, although other analytical techniques like elemental (combustion) analysis, thermogravimetry, and differential scanning calorimetry were also employed. Also investigation of the factors influencing the efficiency of the hydrolytic cleavage.

J. Planar Chromatogr. 18, 443-449 (2005). TLC of six 2-[1-(4-alkylpiperazinyl)]benzothiazoles, two 2-[4-(1-alkyl)piperidinyl]benzothiazoles, three 2-(N,N’-dimethyl-1,2-ethanediamino)benzothiazoles, and 2-[1-(4-aminopiperidinyl)]benzothiazole on RP-18 in a saturated horizontal chamber with mixtures of acetone and aqueous Tris (tris(hydroxymethyl)-aminomethane) buffer (pH 7.4). The organic modifier (acetone) content varied from 40 to 85 % in 5 % increments. Detection under UV.

J. Planar Chromatogr. 3, 430-431 (1990). TLC of 4 dithia[3.3]-phanes on RP-18 silica with methanol - water 9:1. Visualization under UV. Numerical values of the Rf coefficient were established for each solute-phase combination, regressionally fitted into a physically based equation resulting in good correlation.

Chromatographia 34, 303-307 (1992). Stepwise gradient TLC of mixture containing model colored solutes and glycosides from Digitalis species on silica with toluene - ethyl acetate system and ethyl acetate - methanol system. Determination of the optimal gradient programs by using a computer. Discussion of the separation and the agreement of predicted and experimental Rf values and the elution time with the non-aqueous system.

J. Planar Chromatogr. 8, 23-32 (1995). Description of a simple method for optimizing the composition of ternary and quaternary mobile phases based on seven simultaneous experiments using isocratic multi-component phases. The mixture that furnishes the best separation is chosen.