Chromatographia 35, 102-108 (1993). Study of the optimization of TLC parameters. Comparison of the window diagram and overlapping resolution map methods. Use of the latter to take into account the spot diameter and the average plate height variations with the development distance, in order to improve the reliability of the method.

J. Planar Chromatogr. 8, 319-323 (1995). Application of a test mixture (thymol blue, methyl red, bromothymol blue, oracet blue) on silica with an automatic TLC sampler. Followed by radial development with a selection of solvents also delivered by the automatic TLC sampler. Chromatograms can be obtained by densitometry. Inspection enables selection of the approximate solvent strength (Snyder’s solvent classification table) for the separation. The results indicate which solvent group has the required selectivity. So a suitable solvent system can generally be determined in two to three methodical steps. Rapid, cost-effective method requiring minimal solvent and sample consumption.

J. Liq. Chrom. & Rel. Technol. 22, 15-27 (1999). Investigation of the dependence between retention of five different test solutes and the mobile phase composition in TLC systems with 3-cyanopropyl modified silica gel and binary 2-propanol - n-hexane eluents; calculation of regression parameters and conclusions regarding efficiency of the retention models.

J. Planar Chromatogr. 28, 223-228 (2015). HPTLC of beta-amyrin in the leaves of five different Ficus species (F. carica, F. nitida, F. ingens, F. palmata and F. vasta) on silica gel with toluene - methanol 9:1. Detection with p-anisaldehyde reagent followed by heating. Quantitative determination by absorbance measurement at 550 nm. Precisions (intra- and inter-day) were 1.6-1.8 % and 1.7-1.8 % respectively (n=6). The hRF value was 58. Linearity was between 100 and 900 ng/zone. The LOD and LOQ were 32 ng and 96 ng/zone, respectively. Recoveries were 97.6-98.3 %.

InCom-Sonderband 241-244 (1997). Because of the "in-line quality assessment" of the development and the evaluation in TLC at each step of preparation as well as the evaluation of the quality of the separation process after the chromatographic procedure TLC is - according to the author - the most reliable separation technique.

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.