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.

Part II – is silica gel a reliable adsorbent for lipophilicity estimation? J. Planar Chromatogr. 25, 5-9 (2012). TLC of 35 simple compounds with known literature lipophilicity on silica gel with nine concentrations of six modifiers: acetone, dioxane, ethyl acetate, methylethylketone, propan-2-ol, and tetrahydrofuran as mobile phases. Different approaches for lipophilicity determination such as single TLC run, Soczewiñski-Wachtmeister equation coefficients, principal component analysis (PCA) of the retention matrix, and PARAFAC on a three-way array were applied.

J. Chromatogr. 435, 397-416 (1988). Study of the formation of multiple fronts when pure liquids such as methanol and heptane and multi-component liquids such as ethanol - toluene mixtures flow through dry TLC layers of silica or octadecyl-silica. Measurement of the dynamics, and explanation of the formation and motion by using a model.

J. Planar Chromatogr. 3, 389-396 (1990). Forced flow development (OPLC) was used to determine the porosity, permeability, and apparent average particle size of commercially manufactured TLC plates and Empore sheets. Compared with columns, layers exhibit smaller values for the total porosity (eT - 0.69) and interstitial porosity (e U - 0.42).

Chromatographia 34, 431-432 (1992). Reverse-phase TLC of porphyrin ether glycerides on RP-18 silica with acetone - methanol 1:1, and paraffin oil - impregnated silica with acetone - methanol 1:1. Also HPLC. Supplementary physico-chemical characteristics are given for the compounds.

Part I. Linearly increasing development distances. J. Planar Chromatogr. 8, 279 - 283 (1995). Determination of the value RFn, the retention factor after the nth development step (i.e. the ratio of the total migration distance of the component during consecutive development steps to the chromatographic distance of the last development step). The zone width dn of a given spot (after the nth step) is also predicted. The elaborated models are supported with experimental results. - TLC and HPTLC of mixtures of furocoumarin isomers, cannabinoids, and poppy alkaloids (isopimpinellin, xanthotoxin, bergapten, psoralen, angelicin; cannabigerol, cannabichromene, cannabidiol; morphine, codeine, narcotoline, thebaine, papaverine, narcotine) on silica with chloroform and toluene as monocomponent mobile phases for furocoumarins and cannabinoids, resp. chromatography of poppy alkaloids was performed with ethyl acetate - acetone - hexane - methanol - dichloromethane - diethylamine 113:113:226:19:19:1. Detection and evaluation under UV 313 nm for furocoumarin isomers, at 200 nm for cannabinoids, and at 280 nm for alkaloids.

J. Planar Chromatogr. 11, 379-382 (1998). Photoacoustic spectroscopy (PAS) has been used to investigate the influence of the plate-drying process (in a dryer, in a current of warm air, or in ambient air) on the depth-distribution of compounds inside the sorbent layer of TLC plates. The results obtained by PAS studies from different TLC plates were compared with those obtained by reflectance mode slit-scanning densitometry. Use of different drying conditions resulted in significant differences between PAS signals obtained from the same compound in the uppermost 62 µm layer of the sorbent. HPTLC of a test dye mixture on silica gel with toluene. Densitometry at 514 nm.

J. Liq. Chrom. & Rel. Technol. 24, 1381-1396 (2001). Investigation of intermolecular hydrogen-bonding interactions among adsorbed analyte molecules (i.e. so-called lateral interactions) and their real impact on the retention process. To this effect, two different models were elaborated, taking into account the aforementioned interactions. The validity of the two models was checked experimentally with three higher fatty acids as test solutes. The results obtained fully confirmed the practical usefulness of the two approaches. TLC of dodecanoic, tetradecanoic, and hexadecanoic acid on cellulose with decalin. Visualization by spraying with ethanolic bromocresol green solution. Quantification by densitometry at 625 nm.