J. Planar Chromatogr. 19, 443-448 (2006). HPTLC of diclofenac sodium and paracetamol (with aceclofenac as internal standard) on silica gel, pre-washed with methanol, in a presaturated twin-trough chamber with toluene - ethyl acetate - methanol - formic acid 50:40:10:1. Quantitative determination by absorbance measurement at 260 nm. The method was validated regarding accuracy and precision.

Acta Chrom. 17, 292-301 (2006). TLC of ibuprofen and naproxen on silica gel pre-washed with methanol - water 9:1 and dryed at ambient temperature for 3 h. The plates were impregnated with a 0.03 M solution of L-arginine in methanol. Development with acetonitrile - methanol - water 5:1:1 containing several drops of glacial acetic acid for S-(+)-ibuprofen, and acetonitrile - methanol - water 10:2:3 containing several drops of glacial acetic acid for S-(+)-naproxen. Densitometry at 200, 205, and 210 nm for S-(+)-ibuprofen and at 202, 215, and 225 nm for S-(+)-naproxen. The investigations were performed by using three independent measurement techniques, all based on UV absorption: HPLC–UV, HPLC–DAD, and TLC–densitometry.

J. Liq. Chromatogr. Relat. Technol. 29, 1317-1330 (2006). TLC of 13 1H-pyrazolo[3,4-b]pyidine derivatives (e. g. 4-(3’- or 4’-X-phenylamino)-5-carbethoxy-1,3-dimethl-1-H-pyrazolo[3,4-b]pyridine derivatives) on hydrocarbon impregnated silica gel with acetone - phosphate buffer (0.01 M; pH 7.4) mixtures with concentrations ranging from 40-70 % in acetone. Detection under UV 254 nm.

Indian Drugs 44 (3), 205-208 (2007). HPTLC of frusemide (= furosemide) and spironolactone on silica gel with toluene - acetonitrile - glacial acetic acid 70:30:2, with chamber saturation for 15 min at room temperature. Development over 8 cm, followed by air drying. Quantitative determination by densitometry at 254 nm. Linearity was between 8 - 32 ng/µL and 20 - 80 ng/µL for frusemide and spironolactone respectively. The method was validated for accuracy and precision. The limit of detection and quantification for frusemide was 3 ng/µL and 8 ng/µL respectively, and for spironolactone 2 ng/µL and 6 ng/µL, respectively. Recovery by standard addition was 99.4-101% for both compounds.

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.

J. Planar Chromatogr. 20, 451-456 (2007). HPTLC of levetiracetam and oxcarbazepine on silica gel, prewashed with methanol, with toluene - acetone - methanol 3:1:1 in a twin-trough chamber saturated for 20 min at 25 °C. Densitometric evaluation in absorbance mode at 200 and 261 nm.

Ind. J. Pharm. Res. 6 (4), 205-207 (2007). HPTLC of itraconazole on silica gel with toluene - acetone - triethylamine 30:30:1. Detection at 270 nm. The hRf value of itraconazole was 62. Linearity was between 0.2 and 0.6 µg. The market formulation contained itraconazole amounts of 99.6 % via peak height and 100.2 via peak area, respectively. Recovery (by standard addition) was 99.4 % and 100.3 % respectively.