Phytochemistry 31, 3909-3914 (1992). Comparative study of the triterpene patterns of seven sanguisorbeae species by TLC on silica with toluene - ethyl acetate - formic acid 8:2:1. Detection with anisaldehyde - sulfuric acid - water 18:1:1. Detection with anisaldehyde - sulfuric acid. Also PTLC using the same conditions. TLC is used as main tool in a chemotaxonomic study. Excellent conditions for the separation of closely related triterpenes.

Phytochemical Analysis 3, 218-222 (1992). TLC of numerous plant hormones on silica with a chemically bonded C-2 substituent using methanol - water in different proportions and containing 0.7 N NH3. Also TLC on silica impregnated with liquid paraffin and with the silicone fluid dimethylpolysiloxane. Development with aqueous methanol solvents containing NH3. Detection under UV. Systematic study of numerous cytokinins by TLC. Description of excellent chromatographic conditions for the separation of closely related plant hormones.

J. Planar Chromatogr. 4, 293-298 (1991). HPTLC of bitumen (aliphatic compounds, aromatics, resins, and asphaltenes) on silica with heptane; further successive elution with dichloromethane and THF resp. Quantification of aromatics by densitometry (absorbance) at 254 nm; for asphaltenes and the saturates by immersion in a solution of berberine sulfate and densitometry (fluorescence) at 264 nm.

J. Planar Chromatogr. 5, 376-382 (1992). Description of methods for the efficient separation of the 2,4-dinitrophenylhydrazones of eight saturated aldehydes and five saturated ketones by thin-layer and overpressured layer chromatography in normal and reverse phase systems. The migration distances, retardation factors, and selectivity factors measured by overpressured layer chromatography were in most cases greater in overpressured layer chromatography than those measured by thin-layer chromatography. In reverse phase systems there was a stronger linear relationship between RM value and carbon number than in normal phase systems.

J. Chromatogr. 607, 105-111 (1992). TLC of insecticidal amides on silica with chloroform - methanol 10:1, and hexane - ethyl acetate 3:1, followed by reverse-phase HPLC. Detection by their insecticidal activity and purification of five different active amides. Identification by spectral and chemical methods.

Biochemical Systematics and Ecology 20, 771-781 (1992). 2D-TLC of anthocyanins on cellulose with butanol - acetone - water 4:1:5 (top phase) for the first direction and acetone - hydrochloric acid - water 15:3:82 for the second.

J. Planar Chromatogr. 6, 495-496 (1993). Description of an arrangement whereby the TLC plate can be used to receive 2-4 mL volumes of eluate directly from an SPE cartridge. TLC separation of 12 insecticides (oxamyl, dimethoate, methomyl, pirimicarb, carbaryl, carbosulfan, bromopropylate, phosalone, fenithothion, deltamethrin, lindane, endosulfane) on silica with dichloromethane - carbon tetrachloride 9:2 (first development, 8 cm) and dichloromethane - acetonitrile 10:1 (second development, 4 cm).

J. Planar Chromatogr. 6, 322-323 (1993). OPLC of phospholipids (lysophsphatidycholine, sphingomyelin, phosphatidylcholine, phosphatidylserine, phosphatidylinositol, cardiolipin, and phospatidylethanolamine on HPTLC silica gel with hexane - 2-propanol - water 40:53:7. Visualization by treatment with 3% copper acetate in 8% phosphoric acid followed by heating at 180 °C for 5 min.