Magyar Kémiai Folyóirat, 97, 196-205 (1991). TLC of 2-methylenecephalosporins and 2-spirocyclopropyl-cephalosporins on silica with benzene - ethyl acetate 1:1, benzene - ethyl acetate - acetic acid 7:3:1, hexane - ethyl acetate 1:1, chloroform - ether 3:2 or 9:1. Detection under UV and by spraying with ammonium molybdate.

J. Planar Chromatogr. 5, 184-191 (1992). RM values of some basic drugs (used mainly against Parkinson’s disease) and related compounds have been measured by RPTLC with a variety of ion pair reagents in the mobile phase or stationary phases. Retention and separation selectivity were readily controlled by changes in the eluent pH, methanol (modifier) content, or type and concentration of the ion pair reagent. - The strongest effect on the retention of the compounds was obtained when ion pair reagent was incorporated into the stationary phase.

Teil 2 - Simple thin-layer chromatographic identification of active principles in finished products. Part 2. Pharm. Ind. 55, 259-267 (1993). TLC of acetylsalicylic acid on silica with ethyl acetate - methanol - acetic acid 80:19:1. Detection under UV 254 and by exposure to iodine vapor. TLC of paracetamol and of ibuprofen on silica with toluene - acetone - formic acid 50:48:2 and 70:28:2, respectively. Detection under UV 254 and by exposure to iodine vapor. TLC of a series of other drugs from the Essential Drug List were reported, which allow a fast and relatively sure basic quality control in finished products.

J. Planar Chromatogr. 7, 458-460 (1994). HPTLC on silica with chloroform - acetic acid - toluene - methanol 8:1:1:1, previously saturated for 1 h. Quantification by densitometry at 366 nm. Detection limit 0.2 ng. A simple, highly sensitive, and fast HPTLC method.

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.