J. Planar Chromatogr. 9, 185-188 (1996). HPTLC of buspirone, gepirone, ipsapirone, zalospirone and their resp. impurities on silica with the upper layer of n-butanol - acetic acid - water 4:1:2, isopropanol - butanone - NH3 50:50:1, or isopropanol - acetone - NH3 70:30:1; quantification by densitometry at 237 nm. Detection of a specific impurity by spraying with hydroxylamine solution. - Detection limits of a few nanograms were obtained at a signal-to-noise ratio 3:1. The relative standard deviation values for the main components and related impurities were between 2.2 and 3.4%.

J. Planar Chromatogr. 9, 382-387 (1996). TLC of oxazepam, diazepam, nitrazepam, chlordiazepoxide, and medazepam on silica with 6 different mobile phases and on RP-18 with 7 different mobile phases. Visualization under UV 254 nm, by spraying with 2% ethanolic dinitrobenzene solution and after drying with 10% ethanolic sodium hydroxide solution, by exposure to HCl vapor, by placing the plate into a cooled TLC chamber with nitrous gases, or by spraying with Dragendorff's reagent. Quantification by densitometry. Best separation on RP-18 with methanol - pH 3.0 acetate buffer 3:1, detection under UV 254 nm. Detection limits for diazepam and nitrazepam 0.005 mg/mL.

Proc. 9th Internat. Symp. Instr. Chromatogr., Interlaken, April 9.-11., 223-229 (1997). HPTLC of tropisetrone (1aH, 5aH)-8 azabicide (3,2,1)(oct-3 a-yl)-1H indole -3 carboxilate) on silica with chloroform - methanol - hexane - NH3 30:15:5:1. Quantification by densitometry at 228 and 282 nm; at 656 nm after spraying with Dragendorff's reagent and heating at 110°C for 10 min. Reliable and rapid test system.

J. Planar Chromatogr. 11, 247-253 (1998). Investigation of the TLC behavior of deprenyl and some structural analogs. Depending on the pH of the aqueous butanol mobile phase, which can be regulated by changing the ratio of ammonia to acetic acid, use of elution-type separation enables adequate differentiation of a variety of compounds structurally related to deprenyl. TLC of deprenyl and 33 other phenylalkylamines on RP-18 and silica gel impregnated with a solution of paraffin in hexane (10%). Displacement TLC on RP-18 was achieved by forced-flow TLC using a home-made equipment. Spots and displaced bands were observed visually under UV and also monitored by densitometry. 12 different mobile phases were used.

J. Planar Chromatogr. 12, 158-160 (1999). HPTLC of azelastine hydrochloride on silica gel (after prewashing of the plate) with dichloromethane - methanol - triethylamine 75:25:1 with chamber saturation for 10 min. Spot detection and densitometry at 210 nm. The proposed HPTLC method was found to be highly accurate, precise, and sensitive. It is suitable for routine quality control analysis and quantitative determination of azelastine hydrochloride in pharmaceutical preparations.

J. Planar Chromatogr. 12, 225-227 (1999). HPTLC of reaction products between o-aminothiophenol and benzoylformic acid (i.a. phenylbenzothiazole) on silica gel with benzene - dichloromethane 4:1, benzene - methanol 3:7 and methanol. Detection under UV 254 and 366 nm.

J. Planar Chromatogr. 13, 123-129 (2000). TLC of 2-amino-5,6-dimethylbenzimidazoles, 2-aminobenzimidazoles, and 5,6-dimethylbenzimidazoles on layers of rice starch, cellulose and Aminoplast, a carbamide-formaldehyde polymer, with conc. NH3 - n-propanol in varying compositions for rice starch and cellulose resp. cyclohexane - acetone - conc. NH3 in varying concentrations for Aminoplast. Dark spots were observed under UV 254 nm.

Chin. J. Chem. 19, 378-380 (2001). TLC on silica gel with petroleum ether (30-60°C) - ethyl acetate 5:1. Visualization under UV and by exposure to iodine vapor.