J. Planar Chromatogr. 14, 378-383 (2001). Report of experimental results relating to the thermal instability of selected alkyl chemically bonded stationary phases as a result of their irradiation with a high-power neodymium laser, the light source of a Raman spectrometer used for the investigation. The results reported furnish a convincing confirmation of earlier intuitions, described as "vague speculations about the possible aromatization of these ligands".

J. Planar Chromatogr. 17, 250-254 (2004). TLC of three series of beta - diketonato complexes of the type [M(acac)3-n(phacphac)n], [M(acac)3-n(phacphSac)n], and [M(acac)3-n(phSacphSac)n] (where M represents cobalt(III), chromium(III), or ruthenium(III), acac is the 2,4-pentanedionato ion, phacphac is the 1,3-diphenyl-1,3-propanedionato ion, phacphSac is 3-mercapto-1,3-diphenyl-prop-2-en-1-one, phSacphSac is the 3-mercapto-1,3-diphenyl-prop-2-en-1-thion ion, and n = 0-3) on silica gel with five mono-component (chloroform, toluene, dichloromethane, xylene, tetrahydronaphthalene) and five two-component eluents (n-amyl acetate - carbon tetrachloride 1:1, n-butyl acetate - carbon tetrachloride 2:3, chloroform - carbon tetrachloride 1:1 and 3:7, and dichloromethane - carbon tetrachloride 4:1. Separations were performed in a horizontal chamber after equilibration for 30 min. After development the colored spots were readily visible.

J. Planar Chromatogr. 20, 27-37 (2007). The retention factor Rf is used in several criteria generally known as chromatographic response functions. In TLC and HPTLC most of these are based on differences between the retention factors of two substances, which are summed or multiplied. There are also other functions, e. g. the multispot response function which has a clearly defined range (0 to 1), but its distribution is unstable. Here two new independent coefficients: Ru (retention uniformity) and Rd (retention distance) are proposed; these always have values between the range 0 to 1 and stable density, irrespective of the number of compounds separated. An example is given of their use in the separation of fibrate-type antihyperlipidemic drugs by normal and RP-TLC (114 systems).

J. Planar Chromatogr. 30, 401-404 (2017). HPTLC of 35 model compounds on RP-8 with 61 chromatographic systems to determine the solvent strength of 20 solvents on_x000D_ RP-8 phase and to compare the values with a previous study on silica gel. The study showed that the RP-8 phase can behave as normal-phase adsorbent.

J. Planar Chromatogr. 2, 49-52 (1989). Luminiscence polarization of chromatographic spots of 23 DNS amino acids using a two channel scanning laser fluorometric detector. TLC of DNS amino acids on polyamide with 1.5% formic acid in water.

J. Planar Chromatogr. 3, 68-72 (1990). Development of an absolute method for the determination of molecular weight distribution (MWD) of oligomers, based on i.a. 1.) the preparation of chromatograms with continuous distribution of oligomer homologues (OH) into individual peaks in the initial part of the chromatogram, 2.) the micropreparative isolation of the first two low molecular weight OH, and the determination of their structure by high resolution NMR. The MWD of oligostyrenes was calculated from the chromatograms obtained with adsorption HPTLC.

J. Planar Chromatogr. 7, 251-253 (1994). Employment of the Kowalska model of solute retention in liquid - solid chromatography with alcohol - aliphatic hydrocarbon mixtures as binary eluents, for the investigation of the retention of azines, diazines, their dehydrocondensation products, and their methyl and sulfur derivatives. TLC on silica with propanol - hexane in various proportions.

Part II: Characteristics of the second, equilibrium stage of chromatographic separation. J. Planar Chromatogr. 10, 163-166 (1997). Study of the factors which influence the progress of a chromatographic separation provide data which enable better understanding of the process. The properties of a liquid-crystal detector have been used to display changes in the distribution of spot concentration in the second stage of the chromatographic process (in the mobile phase range Zf > 20 mm). Estimates were made of the influence on spot broadening of the type of chromatographic system, the concentration distribution at the origin, RF values, and the duration of the chromatographic process. HPTLC of diphenylamine on silica/kieselguhr with different solvents or their mixtures. The detector was made from the nematic liquid crystal hexylcyclohexylisothio-cyanphenyl.