J. Planar Chromatogr. 17, 164-168 (2004). HPTLC of flupirtine maleate on silica gel with ethyl acetate - methanol - 25 % ammonia 17:2:1 in a saturated developing chamber. Then the developed plate must be dipped for 2 s in 1:3 paraffin - hexane. Dipping increases the fluorescence tenfold and preserves the fluorescence stability for hours. Presentation of a new formula for transforming fluorescence measurements in accordance with Kubelka-Munk theory. The fluorescence signals, the absorption signals, and data from a selected reference are combined in one expression. Only diode-array techniques can measure all the required data simultaneously. The fluorescence calibration curve was linear over the range 300 to 5000 ng per spot.

J. Planar Chromatogr. 25, 493-497 (2012). TLC of 12 sulfonamides on cyano phase with methyl tert-butyl ether - methanol - dichloromethane - cyclohexane - ammonia 25 % 48:2:2:1:1 in the first direction and with water - acetonitrile - dioxane - ethanol 8:2:1:1 in the second direction. The TLC plate was two-dimensional scanned and measured by use of a diode-array scanner.

Anal. Chem. 55, 2429-2431 (1982). Procedure for evaluating sensitivity of a scanning densitometer operated in the reflectance or transmission mode. Azobenzene or phenylacetylene as reference standards.

Anal. Chim. Acta 196, 259-265 (1987). TLC of the products of enzyme reaction of lysine, ornithine and glutamic acid decarboxylases on silica with acetone - 33% aqueous dimethyl amine - isopropanol 18:25:56. Evaluation by radioactivity linear analyser connected to a computer based on a simple modification of the integrated Michaelis-Menten equation. Direct fit of the experimental points to the equation by iterative techniques, the validity of which is tested on the simulated data.

Bio Chromatogr. 3, 127-130 (1988). Description of imaging scanner providing quantitative results with concise reports of peak position, peak area and percentage of total activity, graphic output for visualization of radioactivity distributions. Precise location of compounds, and quantitative evaluation of 2-dimensional TLC separations. Discussion of the possibilities of its application in liquid biochemistry, drug metabolites, toxicology, radiosynthesis, nuclear medicine, etc.

Labo 21, 7-12 (1990). Description of an additional method for quantification in planar chromatography offering qualified quantitative analysis before, with or instead of HPLC with one or many samples simultaneously. The instrumental requirements can be compared with HPLC.

J. Chromatogr. 607, 159-162 (1992). Device for densitometry of horizontally arranged TLC sheets, and comparison with two other devices. Densitometry at 225, 275 and 520 nm in reflectance and transmittance on silica and RP-18 sheets. Presentation of the results of an application to the determination of aspartame.

Selected application: lower alcohols, tryptophan enantiomers, gold and platinum. J. Chromatogr. A 746, 261-268 (1996). TLC of lower alcohols on cellulose with butanol - NH3 30 % 1:1. Detection by spraying with 5% NiSO4. TLC of tryptophan enantiomers on cellulose with 1M NaCl and 40 mM a-cyclodextrin solution at 7°C. Detection by exposure to iodine vapor. TLC of gold and platinum on cellulose with 2.5 M HCl. Detection by spraying with 1M Na2S. Quantification by videodensitometry. Comparison with previous TLC method.