J. of Medicinal Chemistry 31, 2247-2256 (1988). TLC of cis and trans isomers on silica with acetone - toluene - NH3 - 2-propanol 60:40:2:2. Visualization by spraying the dried plate with a mixture of concentrated sulfuric acid - 37% formaldehyde solution 47:3, heating for 5 min. at 110°C and inspection under UV 365 nm.

J. of Medicinal Chemistry 32, 1522-1528 (1989). TLC of aprophen analogues on silica with chloroform - methanol 95:5. Visualization under UV and by exposing to iodine vapor.

Arzneim.-Forsch. 39, 1251-1253 (1989). TLC on silica with different solvent systems, 1) butanol – ethanol – water 90:70:40, 3-fold development over 15 cm each time, 2) ethyl acetate – methanol – water – pyridine 80:80:40:2, single development. Detection by spraying with a solution of 0.5 g thymol in ethanol – sulfuric acid conc. 95:5 and heating at 120 °C for 15-20 min. Determination of radiochemical purity with two-dimensional TLC on cellulose with acetone – water 70:30.

J. Planar Chromatogr. 3, 407-409 (1990). HPTLC of cyproterone acetate and ethynyl estradiol on silica with cyclohexane - ethyl acetate 6:4 as mobile phase and 17ß-estradiol as internal standard. quantification by densitometry (absorbance at 284 nm). Detection limit for cyproterone acetate was 5 ng, for ethynyl estradiol 30 ng. The relationship between the spot concentration and the cyproterone acetate 17ß-estradiol area ration was linear over a range of 5 to 120 ng; for ethynyl estradiol the linear range was 120 to 1200 ng. The proposed assay is suitable for routine drug control.

J. Planar Chromatogr. 4, 370-372 (1991). HPTLC of polidocanol (mixture of monolauryl ethers of polyethylene glycols) on silica with MEK - acetone 10:1, water saturated. Visualization by dipping the plates for one second into a solution of 2% potassium dichromate in 12% aqueous sulfuric acid. Quantification by densitometry in reflectance mode at 600 nm. CV =3.4% (n=10) and recovery rate 97.0 + 3.1% (n=8).

- Simple thin-layer chromatographic identification of active principles in finished products. Pharm. Ind. 56, 478-483 (1994). TLC of albendazole and mebendazole on silica with hexane - ethyl acetate - acetic acid 7:2:1. Detection under UV 254 nm, by exposing to iodine vapor. and by spraying with Dragendorff / Ce(SO4)2.

J. AOAC Int. 78, 41-49 (1995). TLC on silica: of acetaminophen with ethyl acetate - methanol - NH3 85:10:5; of amoxicillin, ampicillin, benzylpenicillin, cloxicillin with acetone - water - toluene - acetic acid 26:4:4:1; of chloramphenicol with chloroform - methanol 9:1; of chloroquine phosphate with ethanol - water - NH3 85:11:4; of estradiol cypionate with chloroform - toluene - ethyl acetate - methanol 45:36:6:1; of mebendazole with chloroform - methanol - formic acid 90:5:5; of praziquantel with chloroform - acetone 1:1; of quinine sulfate with ethanol - NH3 - water 85:4:1; of sulfamethazine, sulfamethoxazole with chloroform - acetone - methanol - NH3 - water 80:80:40:3:2; of theobromine, theophylline with chloroform - acetone 1:1; of trifluoperazine with acetone - NH3 24:1. Detection by immersion into a solution of iodine and acidified potassium iodide; quantification by densitometry at 254 nm.

J. Planar Chromatogr. 9, 197-198 (1996). TLC of sorbic acid, p-hydroxybenzoic acid, parabens, carbamazepine, methylparaben, propylparaben on silica with e.g. toluene - isopropanol - diethylamine 10:10:1 in the first direction and after impregnation of the plate with paraffin in n-hexane resp. with methanol - water - acetic acid 350:150:1, saturated with liquid paraffin, in the second direction. Detection under UV. The proposed approach has the advantage of enabling determination of p-hydroxybenzoic acid in the presence of other acidic compounds.