CBS Publishers & Distributors)*, Delhi 110032 (India), 1992, 244 pages. Detailed TLC procedures for the separation and identification of more than 170 drug formulations in divergent combinations, arranged in 17 classification systems are described; predominantly silica is used with numerous solvent systems, two of them designated universal systems as these are suitable for more than 100 drug formulations; solvent system I = benzene)** - methanol - NH3 75:25:0.25; system II = butyl acetate - formic acid - chloroform 60:40:20. UV and iodine vapors were used for visualization in most cases. Recommendations for setting up a TLC laboratory are given in the introduction. (Remarks by the editor: )* CBS Publishers have nothing to do with the CAMAG CBS, the name is coincidental. )** Benzene, which is banned from laboratory use in most countries, may be substituted with toluene.)

J. Planar Chromatogr. 6, 38-42 (1993). Displacement TLC can be used for fast and effective separation of some plant ecdysteroids. Presentation of results obtained by one-dimensional (displacement) and two-dimensional (elution - displacement) TLC and description of the use of pilot systems for determining the optimum conditions for displacement TLC.

Chinese J. Chromatogr. (Sepu) 11, 146-148 (1993). TLC of oligonucleotides on silica with 1) isopropanol - water - NH3 6:3:1, 2) propanol - water - NH3 6:3:1, and 3) propanol - water - NH3 11:7:2. Detection under UV 254 nm.

J. Planar Chromatogr. 6, 112-116 (1993). The use of the colorimeter for standardization of color measurement in thin-layer chromatography, and the handling of the data obtained, have been evaluated. The identification power, expressed as the mean list length (MLL), was 8.32 and 6.34 for visual and colorimetric methods, respectively. When fluorescence measurements were included in the encoding system, the MLL obtained from visual coding dropped dramatically to 2.90. The colorimeter tested was not able to measure UV reflection.

J. Planar Chromatogr. 6, 232-237 (1993). TLC of 47 flavonoids and related compounds (glycosides, flavonols, phenolcarboxylic acids, coumarins, flavones, isoflavones) on 7 different layers (normal phase silica, RP-18, Diol, Cyano, RP-2, Phenyl, amino) with 7 mobile phases. Detection by spraying with 4% NP/PEG reagent and inspection under UV at 365 nm.

J. Chromatogr. 626, 109-116 (1992). TLC of isomers of methyl oleate hydroperoxides on silica, or on silver nitrate-impregnated silica with hexane ether 65:35. Detection under UV 254 nm after spraying with a 0.2% ethanolic solution of 2,7-dichlorofluorescein sodium salt. Analysis by HPLC and determination by GC-ion-trap detector MS.

J. Planar Chromatogr. 6, 181-186 (1993). TLC of 30 cephalosporins on silanized silica with 7 mobile phases; detection under UV 254 or by spraying with a solution containing 0.25% ninhydrin and 1% acetic acid in ethanol and subsequent heating at 105 °C for 15 min. Also by exposure to iodine vapor. Identification of all the substances by combining chromatography with two mobile phases and color reactions.

J. Agric. Food. Chem. 42, 1110-1114 (1994). TLC of lipoic acid on silica with sequentially 1. diethyl ether - petrol ether (35-65°) - acetic acid 30:20:1, 2. hexane and 3. water-saturated butanol - acetone 1:1 against oxidized lipoic acid as standard.