J. Chromatogr. 437, 411-421 (1988). Description of a two-dimensional image-processing procedure for TLC ojects. Use of a computer-controlled high-speed scanning photometer in vertical remission mode. Presentation of the software for digital evaluation of chromatograms. Demonstration of the flexibility of the method with some typical examples. Detection limit, in ng range. Mean error < 2%.

Anal.Chem. 61, 1931-1933 (1989). Description of a laser-based indirect fluorometric detection method for TLC with two-dimensional scanning capability and without derivatization. Detection limit 6 ng. The linearity in indirect fluorometric detection is found to be over 2 orders of magnitude.

J. Planar Chromatogr. 5, 9-15 (1992). TLC of amiloride and an organic sulfonium salt (C13H17OS·AsF6) on silica C-8 resp. silica. Subsequent successful imaging of these samples directly from the TLC plates with high spatial resolution, high mass resolution, and high sensitivity.

J. Planar Chromatogr. 9, 4-15 (1996). Description of basic principles of reflectance measurement (Kubelka-Munk Equation, inhomogeneity of absorption), calibration and evaluation (introduction, linear regression, linearized regression, two-dimensional linear regression, saturation function as calibration curve, single level calibration), errors in quantitative HPTLC analysis (systematic errors, statistical errors, reduction of errors). - HPLC and HPTLC, based on absorption and fluorescence phenomena, should be directly comparable in terms of precision and accuracy. Under certain precautions the relative standard deviation is ca. 0.6 to 1.5%, depending on the problem, if calibration and data evaluation are performed correctly.

J. Planar Chromatogr. 12, 244-254 (1999). Evaluation of a new type of radiodetector designed for digital autoradiography of TLC plates. The concept is based on the parallel avalanche detection. - TLC of lipids and steroids on silica gel with n-hexane - ether - acetic acid 65:35:1 in a horizontal glass chamber previously saturated with the same mobile phase. A second development was performed with n-hexane as eluent. Quantitation by densitometry after dipping for 30 s in 3% sulfuric acid, drying at 60°C for 15 min, and heating at 160°C for 15 min.

Part 1. Description of the method and basic possibilities. J. Planar Chromatogr. 15, 454-457 (2002). Description of the principle of a novel liquid chromatographic method, fully on-line TLC/HPTLC, which integrates the idea of the continuous development, continuous-flow TLC, and diode-array detection; including the design of the prototype apparatus, and the fundamental advantages of the novel technique. HPTLC and TLC of a test dye mixture on silica gel with dichloromethane. Detection was performed with a new TLC/HPTLC scanner with optical fibers, a special fiber interface and a diode-array detector working in the range of 197 nm to 800 nm with an average optical resolution better than 2.0 nm.

J. Liq. Chromatogr. Relat. Technol. 40, 320-326 (2017). HPTLC of 31 substances of toxicological interest on RP-18 with 60 % acetonitrile in buffer pH 6.0, on silica gel with chloroform – methanol 9:1 and using pressurized planar electrochromatography (PPEC) on RP-18 with 60 % acetonitrile in buffer pH 2.2. The authors showed the application of the migration distance of the solutes, obtained by the PPEC technique, with a proposed equation allowed for increase of likely identification of substances in toxicological analysis.

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.