J. Planar Chromatogr. 27, 1999-2020 (2014). HPTLC of methocarbamol in pharmaceutical mixtures with ibuprofen, paracetamol and diclofenac sodium and in the presence of its degradation product guaifenesin on silica gel with chloroform - methanol 47:3. Quantitative determination by absorbance measurement at 264 nm. A chemometric handling of the TLC peak responses involving the convolution of the derivative curves using 8-points sin x i polynomials, allowed the analysis of different mixtures of methocarbamol with enhancing of the regression parameters.

J. Planar Chromatogr. 10, 114-117 (1997). Using the analysis of addictive substances as an example an overview is given of the use of eight different development techniques to illustrate the improvements of the efficiency of thin-layer chromatography. Optical comparison of chromatograms and determination of separation numbers are used to provide information about the separation performance of each system. A comparison has been made of AMD, ADC and normal chamber developments of HPTLC and TLC plates with and without chamber saturation. The separation performance has been investigated using separation numbers according to Geiss and Kaiser. The highest separation number (23.5) was obtained by use of AMD. Separation numbers of approximately 18 were obtained with HPTLC plates. The worst separation numbers (7.7-15) were, as expected, obtained with TLC plates. The improvements in TLC techniques over recent years are emphasized. Substances chromatographed: anthranilic acid, codeine, DMT, etryptamine, morphine, DOB, theobromine, Sudan III.

Acta Chromatographica 20(3), 309-327 (2008). Presentation and discussion of an approach based on the distances to the closest spot and to the top or bottom of the plate in the optimization of two-dimensional thin-layer chromatographic separation. This is different to the method of relying on selection of the two most orthogonal chromatographic systems which best co-operate in the separation, which is mainly achieved by investigating the correlation between hRf values or scoring the distances between the spots. The theory arises from a well-known geometrical problem about equal-spreading of the points inside a unit square, proposing two coefficients, sensitive and insensitive, to complete separation. This is the two-dimensional version of the previously proposed criteria retention uniformity and retention distance, which describes the equal-spreading of the spots in one-dimensional chromatography. The coefficients range from 0 to 1 and their distribution as a random variable is well defined and not affected by the number of separated compounds.

J. High Resol. Chromatogr. 5, 139-142 (1982). Considerations of TLC process optimization based on the thermodynamic theory of adsorption from multicomponent solvents using experimental and theoretical RM 1,2 = f (01) relationship.

J. Chromatogr. 262, 113-120 (1983). OPTLC of mixture of lipophilic dyes. Studies of different parameters such as flow-rate, migration distance and layer thickness. Comparison of OPTLC with HPTLC.

Chromatogr. 2, 13-19 (1985) (Chinese) (Analysis of organometallic compounds IV. Thin-layer chromatography of borane anion ferrocene quaternary ammonium salts.) TLC of the title compound on silica with cyclohexane - acetone - 0.2 M tetraethyl ammonium bromide 2:10:1.2, or cyclohexane - acetone - 0.2 M tetrethylammonium iodide 2:10:1.2. Detection with iodine vapour. Discussion of relationship between the structure and Rf values.

J. Planar Chromatogr. 5, 275-279 (1992). Study of the chromatographic behavior of 12 compounds structurally related to diethanolamine on 4 types of RP-plates with methanol - water and examination of the linear, quadratic, and multi parametric correlations between the experimentally determined chromatographic parameter log k’, and the calculated molecular structure descriptors of the amino alcohols. HPTLC of 2-aminoethanol, diethanolamine, tris-(2-hydroxyethyl)amine, N-methyldiethynolamine etc. on silanized RP-8 and RP-18 silica, silica with methanol - water. Visualization with 2,2-dihydroxyindan-1,3-dione solution (0.4 g in butanol - acetic acid 100:1) and heating at 80° for 180 min.

Chromatographia 53 (Sup.), S-442 - S-444 (2001). Study of the chromatographic behavior of six antihypertensive drugs from the class of ACE inhibitors under conditions of salting-out. TLC on silica gel, cellulose and polyacrylonitrile (PANS) as sorbents, and with different concentrations of aqueous ammonium sulfate solution as solvents. It was established that in all cases studied hRf values decrease with increasing salt concentration in the solvent systems used. A linear relationship of the corresponding RM values and ammonium sulfate content in the solvent was observed. Proposal of a separation mechanism based on hydrophobic interaction between the sorbent and sorbens.