Chromatographia 35, 325-326 (1993). TLC on silica with 14 different solvent systems. Detection by spraying with concentrated sulfuric acid and heating at 100 °C for 1-2 min. discussion of the correlation of the colors of spots of guaianolides after spraying.

J. Planar Chromatogr. 6, 204-207 (1993). TLC of sodium phosphate salts of betamethasone, dexamethasone, and prednisolone on mixtures of silanized silica gel H and HF 254 with aqueous 0.05 M triethylamine, pH 4.2 - methanol 3:2. Quantification by densitometry at 240 nm.

J. Planar Chromatogr. 6, 212-215 (1993). OPLC of 8 aromatic N glycosides on silica impregnated with 0.2 M TCMA and methanol - water 4:6. Visualization under UV at 254 nm.

Phytochemistry 36, 377-382 (1994). TLC of Gentiana constituents on silica with chloroform - methanol 17:3. Detection by UV and with vanillin-sulfuric acid reagent. Preparative centrifugal TLC on silica with a chloroform - methanol gradient.

Part 1: Chromatographic separation and postchromatographic derivatization. J. Planar Chromatogr. 7, 10-13 (1994). TLC/HPTLC of neomycins A, B, and C on silica with methanol - NH3 25% - acetone - chloroform 7:4:4:1 at 50°C. Postchromatographic derivatization with fluorescamine, stabilization of fluorescence by dipping the developed chromatogram into a solution of dichloromethane - triethanolamine - light liquid paraffin 8:1:1. Quantification by densitometry at 302/>400 nm. The method is so sensitive that it is possible to determine the individual neomycin components quantitatively at the very low concentrations at which they are found in neomycin raw material. Detection limits: 20 ng substance / chromatogram zone.

Int. J. Pharmacog. 31, 68-76 (1994). TLC of 153 plant extracts on silica with petrol ether - ethyl acetate 1:1 for chloroform extracts and with chloroform - methanol - water for methanol and water extracts. TLC plates were run in duplicate. One plate was used for bioautography with Cladosporium cucumerinum, the second plate serving as reference chromatogram was stained with Godin reagent. Propiconazole and miconazole were used as positive controls. Also assessment of activity against Candida albicans by an agar overlay TLC assay.

J. Planar Chromatogr. 7, 221-228 (1994). One and two-dimensional HPTLC of benzophenanthridine alkaloids on silica with benzene - methanol 6:1 and with chloroform - benzene - methanol - formamide 80:100:20:1. Visualization under UV. Quantification by coupling TLC-FAB. The combination of mass spectrometric detection with a chromatographic separation method provides analytical data of equal utility for characterization of this mixture as does capillary electrophoresis, but the higher loadings of material on the TLC plate enable easier identification of the mixture components. Despite the perceived lower reproducibility for TLC, it is shown that reproducibility in Rf and mass spectral data is excellent.

Chinese J. Herb Med. (Zhongcaoyao) 25, 462-463 (1994). TLC of the saponins from medicinal herbs on silica with cyclohexane - ethyl acetate 5:3. Detection by spraying with vanillin - acetic acid - sulfuric acid 1:50:1. Quantification by densitometry at 425 nm. Comparison of the extraction technologies according to the results.