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.

Proc. Intern. Symp. on Planar Separations Plan. Chrom. 357-362 (2003). Investigation of the retention behavior of thiazoles as function of organic modifier content of the eluents using two types of stationary phases. TLC of 12 3-benzyloxycarbonyl-5-substituted 2,4-dioxotetrahydro-1,3-thiazoles on silica gel, impregnated with paraffin oil, and rice starch with NH3 conc. - methanol, conc. NH3 conc. - dioxane, and NH3 conc. - acetone with different modifier content (from 0.01 to 0.34 ) for methanol, dioxane, and acetone. Visualization under UV 254 nm.

J. Planar Chromatogr. 16, 351-358 (2003). TLC of bezafibrate, ciprofibrate, clofibrate, clofibric acid, fenofibrate, and gemfibrozil on silica gel, aluminium oxide, amino-, diol-, and cyano-modified silica gel and polyamide 11 with mobile phases containing hexane as weakly polar diluent and five polar modifiers: acetone, dioxane, methyl ethyl ketone, ethyl acetate, and tetrahydrofuran. Visualization under UV 254 nm. Quantitation by videodensitometry and densitometry.

Indian Journal of Pharmaceutical Sciences 66 (1), 132-135, 2004. HPTLC of bacoside A in Bacopa monnieri and in its commercial monoherbal capsule formulation on silica gel 60 F254 aluminium sheet, 20 x 10 cm, with chloroform - methanol - water 30:15:1. Quantification by densitometry at 540 nm via linear regression in the range of 30 -180 µg/mL. Rf of Bacoside A was found to be 0.51. Validation regarding to accuracy, precision, specificity and recovery (97.4 – 100.1%). The proposed simple and sensitive method provides faster and cost effective qualitative control for routine analysis of bacoside A in formulations containing Bacopa monnieri saponins.