J. Chromatogr. 295, 31-47 (1984). The Rf values of 55 drugs in 40 eluent mixtures are reported. Principal components analysis of these data provides a four-significant-components model, which explains 92 % of the total variance. Four eluent mixtures, chosen on the basis of the above criterion and of the Rf reproducibility, provide a two significant principal components model that can be used for the identification of unknown samples.

Chromatographia 23, 648-650 (1987). Survey of the TLC behavior of 58 inorganic ions on polyethyleneimine (PEI) cellulose in hydrochloric acid - ammonium thiocyanate media. Investigation of the correlation between Rf values on PEI cellulose in the thiocyanate media and the paramagnetic moment of the rare earths (III), and of an odd-even fluctuation against the atomic number for the heavy rare earths (III). Demonstration of separation of many inorganic ions in the system.

J. Planar Chromatogr. 6, 362-367 (1993). Use of thermodynamic treatment for the description of the chromatographic process in the system adsorbent - two component mobile phase - solute. Two parameters (As(12), a term describing molecular interactions in the bulk phase, and K12, the adsorption equilibrium constant for the system adsorbent)characterize the given chromatographic system and must be known for theoretical prediction of solute retention in column liquid chromatography. Experimental chromatographic data obtained by TLC performed in saturated and sandwich chambers were used for the theoretical prediction of As(12) and K12 in given chromatographic systems.

J. Planar Chromatogr. 17, 464-467 (2004). Displacement chromatography (DC) has been widely used to separate metabolites with similar chemical characteristics. DC works with highly overloaded sample sizes, which are normal for samples not subjected to clean-up. DC successfully handels samples which contain high concentrations of salts and/or proteins, and results in consecutive steps of displaced compounds rather than Gaussian curves. Planar displacement chromatography (DTLC) is suitable for seeking new metabolites in excreted body fluids. Transfer of the radiolabeled methyl group can easily be proven using spacer-displacement planar chromatography. Displacement TLC of L-deprenyl and 14C-L-deprenyl on silica gel with chloroform - triethanolamine 19:1. Detection by X-ray film with an exposure time of 120 h.

Abstracts of 1985 Beijing Conference and Exhibition on Instrumental Analysis, 528, (1985). Utilization of relative scattered target (RST), set pattern count (SPC) and stepwise combination (SC) in selecting the optimal TLC system for 13 barbiturates from 14 different systems SC method was found best.

Comparison of 5 methods for selecting the best solvent combinations from 34 systems in TLC of 16 steroid hormonal drugs with systematic combination as the best

J. Planar Chromatogr. 1, 102-115 (1988). Discussion of the role of the vapor phase in TLC, stressing on the influence of gaseous solvent molecules on sorbent-solvent sorbent-water, water-solvent, sorbent-water-solvent, solvent- solvent interactions, with experimental data related to pre-conditioning. Description of the methods controlling chromatographic behavior of layer locally via pre-conditioning gradients.

J. Planar Chromatogr. 2, 71-75 (1989). A validation procedure for TLC scanners is presented including determination of signal to noise ratios and instrumental sensitivity. Using test plates, the overall reliability can be determined. Validation of individual parts of the software is done by comparison of different algorithms, for example smoothing algorithms. Validation of spotting devices is shown to be possible by analysis of variances from different types of scans in order to separate errors created by positioning and measurement.