J. Planar Chromatogr. 11, 132-136 (1998). HPTLC of fourteen 1,4-benzodiazepines (diazepam, bromazepam, dipotassium chlorazepate, chlordiazepoxide, clonazepam, flurazepam flunitrazepam, nitrazepam, medazepam, lormetazepam, oxazepam, prazepam, temazepam, tofisopam; clobazam, midazolam, triazolam, alprazolam, clotiazepam) on silica gel with chloroform - acetone 4:1and benzene. After thermal treatment the Bratton - Marshall diazotization reaction can be used for the detection of benzodiazepines (BZ) and benzophenones when the substituent is a secondary amino group. Thermal treatment alone also gives color reactions with some BZ, and in combination with Bratton-Marshall reagent and the Rf values of the drugs serves as a specific method of identification of various BZ.

J. Planar Chromatogr. 12, 161-164 (1999). HPTLC of isosorbide mononitrate on silica gel with chloroform - methanol - acetic acid 270:30: 1. Evaluation by densitometry in absorbance mode at 200 nm. The HPTLC method for determination of IS-5-MN in pharmaceuticals has been fully validated and applied successfully for process-parameter assessment and in-process monitoring of Monosan tablets. Terfenadine was used as the internal standard. Large sample throughput, small solvent consumption, and robustness in terms of in situ analyte stability and applied volumes are the main advantages of the HPTLC method. System suitability results indicate that the method could be used for impurity and stability testing of IS-5-MN when IS-2-MN and ISDN (isosorbide dinitrate) are considered as impurities.

J. Liq. Chrom. & Rel. Technol.19, 17-21 (1996). HPTLC of salicylic acid on silica gel with n-pentyl formate - chloroform - formic acid 2:7:1. Detection under UV 254 nm; quantitation by densitometry in the single-beam reflectance mode. Variation coefficients for the analyses was 3.9 and 5.6 %, respectively.

Part 1. Lipophilicity of 1-(1-arylimidazolin-2-yl)-3-arylureas and 1-aryl-2-imine-3-arylaminocarbonylimidazolidines. J. Planar Chromatogr. 13, 52-56 (2000). Determination of the lipophilicity of forty new derivatives of 1-aryl-2-aminoimidazolines (twenty 1-(1-arylimidazolin-2-yl)-3-arylureas and twenty 1-aryl-1-2-imine-3-arylaminocarbonyl-imidazolidines) by RP-TLC with methanol - acetic acid - water. Visualization under UV at 254 nm.

J. Planar Chromatogr. 14, 47-52 (2001). TLC and rotation planar chromatography (RPC) of 17 indol derivatives on silica gel with acetic acid - ethyl acetate - toluene - hexane 4:11:70:15. The PRISMA system was used in pre-assays to optimize mobile-phase composition. Another mobile phase used was chloroform - ethyl acetate - formic acid 5:4:1. Quantitation by densitometry at 280 nm.

JAOAC Int. 84, 1703-1707 (2001). TLC of indomethacin, 4-chlorobenzoic acid, and 5-methoxy-2-methyl-3-indoleacetic acid on silica gel with 2-propanol - 25% NH3 - water 8:1:1. Detection under UV 268, 236 and 292 nm. Simultaneous determination of both impurities by densitometry at 230 nm and at 284 nm for indomethacin.

J. Planar Chromatogr. 15, 42-45 (2002). TLC of acyclovir (9-[(2-hydroxyethoxy)methyl]guanine) on silica gel with n-butanol - acetic acid - water 5:3:2. Densitometry in absorbance-reflectance mode at 277 nm. The method was validated for linearity, homogeneity, detection limit, accuracy (100.2 to 101.5%), and range. Simple, rapid, cheap and validated TLC method.

J. Liq. Chrom. & Rel. Technol. 25, 1483-1495 (2002). TLC of phenolic drugs (methyldopa, norepinephrine, terbutaline, bamethane, ethamivan, phloroglucinol, pentazocine, hexachlorophene, pyrocatechine, niclosamide, salicylanilide, thymol, eugenol) on silica gel with acetic acid - n-butanol - water 1:4:1, chloroform - methanol 9:1 and with benzene. 13 detection agents (e.g. alkaline blue, aniline blue, bromophenol blue, bromothymol blue, alkaline solution of brilliant cresyl blue, bromocresol green, helasol green, aqueous solution of brilliant cresyl blue, neutral red, phenol red) were tested; aniline blue and brilliant green were the best and most universal visualizing reagents for the phenolic drugs investigated.