J. Planar Chromatogr. 19, 157-160 (2006). Determination of the lipophilicity of twenty new diquinothiazines by reversed-phase thin-layer chromatography on RP18 with acetone-aqueous TRIS (tris(hydroxymethyl)aminomethane) buffer as mobile phase. TLC on RP18 with mixtures of acetone and aqueous TRIS buffer pH 7.4 in pre-saturated chromatographic chambers. Detection by UV 254 nm.

J. Planar Chromatogr. 19, 288-296 (2006). TLC of metformin hydrochloride, pioglitazone hydrochloride, rosiglitazone maleate, gliclazide, and glibenclamide on silica gel in a pre-equilibrated chamber at 26 - 30 °C with toluene - ethyl acetate - methanol 17:2:17 and n-butanol - acetic acid - water - methanol 12:4:1:2. Detection by exposure to iodine vapor. Highly reproducible RF and compact spots were obtained in normal-phase TLC which was found to be the least expensive method.

J. Planar Chromatogr. 19, 427-431 (2006). HPTLC of sildenafil citrate on silica gel, pre-washed with methanol, with toluene - acetone - methanol 3:1:1 in a saturated twin-trough chamber. Quantitative determination by absorbance measurement at 312 nm. The method was validated in accordance with ICH guidelines on the validation of analytical methods.

J. Liq. Chromatogr. & Relat. Technol. 30, 489-498 (2007). TLC of fenbendazole (methyl [5-(phenylthio)-1H-benzimidazole-2-yl]-carbamic acid methyl ester) on silica gel using dichloromethane - ethyl acetate - formic acid - methanol 60:5:3:3. Quantitative determination by absorbance measurement at 293 nm. Linearity (peak area) is given between 500 and 1400 ng/spot.

Pharmazie 61, 517-521 (2006). TLC of 1-phenyl-2-(4-aryl-1,3,4,5-tetrahydropyrido[2,3-b][1,4]diazepin-2-ylidene)-ethanone on silica gel with diethyl ether - ethanol 5:1; detection under UV light.

A study of the mechanism and thermodynamics of retention. J. Liq. Chromatogr. Relat. Technol. 28, 2499-2513 (2005). TLC of R,S-(+/-)-ibuprofen and S-(+)-ibuprofen on silica gel prewashed with methanol - water 9:1 and impregnated with a 0.03 mol/L methanolic solution of L-arginine by dipping. Separation with acetonitrile - methanol - water 5:1:1 and several drops of acetic acid to adjust the pH to 4.8. Two dimensional development with the same mobile phase in the first direction, followed by drying and application of the S-(+)-enantiomer and development in the second direction. Densitometric evaluation at 210 nm. Chiral separation of propanolol with acetonitrile - methanol 15:4 containing ammonia for one and two dimensional separation.

Indian Drugs 44(10), 734 (2007). HPTLC of valdecoxib on silica gel with toluene - ethyl acetate 1:1. Quantitative evaluation by densitometry at 262 nm. Valdecoxib was well separated from rofecoxib. Linearity was between 800 and 1000 ng/zone. Recovery was 98.9 %.

J. Sep. Sci. 30, 1893-1898 (2007). HPTLC of L-DOPA in tablets on silica gel with acetone – chloroform – n-butanol – acetic acid glacial – water 12:8:8:8:7. Quantitative determination by absorbance measurement at 497 nm. The hRf value of L-DOPA was 37 and selectivity regarding matrix was given. Linearity was between 100 and 500 ng/µL. The intra-assay variation was between 0.26 and 0.65 % and inter-assay variation was between 0.52 and 2.04 %. The limits of detection and quantification were 1 and 3 ng/µL, respectively. No significant difference was found between this method and the official HPLC method.