Desaga offprint Thin-layer Chromatography, Heidelberg, 1-4 (1994). Parameters to validate a method are listed and explained like purity of reagents/reference substances/solvents, identity testing, specificity, linearity, precision, trueness, detection resp. determination limits, sensitivity and ruggedness.

TrAC 21, 468-486 (2002). The article describes the valuable lessons learned from EU while funding a method-validation project (1996-2000) to meet European mycotoxin control in foodstuffs. It shows the performance characteristics of validated and official methods for aflatoxins, the selection and development of methods for validation, and the preparation of naturally contaminated mycotoxin test materials for validation studies. The authors put special emphasis on validation of TLC methods for mycotoxins for developing countries, as the main exporters to Europe of food and food products.

Biomed. Chromatogr. 23 (8), 881-887 (2009). HPTLC investigation of salicylic acid derivatives on RP-phase with various methanol - water and dioxane - water binary mixtures in order to establish relationships between chromatographic data and selected physico-chemical parameters that are related to ADME (absorption, distribution, metabolism and elimination). A linear correlation between RM values and the volume fraction of mobile phase modifier was observed. The obtained RM0 values were correlated with lipophilicity, solubility, human intestinal absorption, plasma-protein binding, and blood-brain barrier data.

Part 6. Calculation of reflection and transmission using Markov chains. J. High Resol. Chromatogr. 5, 694-695 (1982). Theoretical model for quantitative evaluation of chromatograms using Markov chains and transition matrix in probability calculations to describe a stochastic process.

11. Mitteilung: Berechnung von Retentionen an Kieselgel. (Ion-pair adsorption TLC of quarternary ammonium ions. 11. Communication: calculation of retention values on silica.) Pharmazie 39, 396-398 (1984). TLC of Me4N+, Et4N+ and other quaternary ammonium cations on silica with acetone - water. Detection with Dragendorff reagent.

Chromatography the State of the Art, Vol. II, Akademiai Kiado, Budapest 1985, 633-652. The reliability of the suggested mathematical model for the determination of ion exchange constants (in the absence of complex formation in solution) base on the Rf values of the "tail" of a zone obtained in elution TLC demonstrated with the example of lanthanum and nickel adsorption from perchlorate solutions on Fixion 50 x 8 plates, by comparing calculated and experimentally measured results. Layer: Dowex 50 x 8 in the Na-form; lanthanum oxide and nickel chloride in 1M HClO4 or 1M HCl; 0.1 % aq. arsenazo (III) solution was used to visualize the lanthanum zones, and a 0.1 % ethanolic solution of rubeanic acid (dithiooxamide) to visualize the nickel zones.

II. Comparison of different TLC techniques as pilot methods for mixtures separation by column liquid chromatography. J. Planar Chromatogr. 4, 241-245 (1991). Theoretical parameters for an adsorbent - binary solvent mixture - solute chromatographic system describe (i) the equilibrium between adsorbed solute and solute dissolved in the mobile phase, (ii) molecular interactions accuring in the mobile phase. Separations by HPLC, TLC in a saturated chamber and TLC in a sandwich chamber show clearly, that TLC should be performed in a sandwich chamber if TLC is used as a pilot technique for HPLC.

J. Planar Chromatogr. 13, 276-280 (2000). The study of different papers for printing and archiving chromatograms indicates that the quality of ink-jet printing is also substantially determined by the choice of the right paper and color combination. Quantitative evaluation of the paper samples was performed by a video documentation system.