J. Planar Chromatogr. 22, 29-33 (2009). HPTLC of theophylline (extracted at pH 8.5 with chloroform - isopropanol 4:1 from post-mortem blood after acid hydrolysis) on silica gel in a twin trough chamber with chloroform - methanol 9:1. Quantitative determination by absorbance measurement at 277 nm. Polynomial regression in the range of 0.5-20 µg/mL. The limit of detection was 0.5 µg/mL (S/N = 3). Intra-day and inter-day repeatability was between 0.5-0.8 % and 0.5-1.3 %, respectively, for three different concentrations in the range of 0.5-10 µg/mL. Recovery was 89.1-93.4 % at a concentration of 10 µg/mL and pH 8.3-8.6. An average analytical recovery of 89.9 % was achieved at pH 8.5 with a relative standard deviation of 2.2 %. Theophylline was stable in methanolic solution and during chromatography.

J. Planar Chromatogr. 22, 363-366 (2009). HPTLC of 5-hydroxymethylfurfural in seven Turkish fruit wines and three Turkish vinegars on silca gel with toluene - ethyl acetate - 90 % formic acid 6:3:1 in a twin trough chamber saturated for 20 min. Quantitative determination by absorbance measurement at 286 nm. The limit of detection and quantification was 0.05 and 0.13 ng/mL, respectively.

J. Planar Chromatogr. 22, 371-376 (2009). HPTLC of indolizidine alkaloids and extracts on silica gel and RP-18 (both prewashed with chloroform-methanol 1:1) with 11 mobile phases in a horizontal chamber without chamber saturation. The best resolution was achieved on silica gel with chloroform - methanol 20:1. Detection under UV 254 nm and after spraying with Dragendorff reagent. Quantitative determination of securinine and allosecurinine by absorbance measurement at 254 nm. The limit of detection and quantification was 11 and 36 ng/zone for securinine and 12 and 41 ng/zone for allosecurinine, respectively.

60th Indian Pharmaceutical Congress PG-251 (2008). HPTLC of glycyrrhetinic acid and piperine in haematinic herbomineral capsule formulation on silica gel with toluene - ethyl acetate - glacial acetic acid 25:15:1. Quantitative determination by absorbance measurement at UV 254 nm. The method was linear in the range of 0.8-2.4 ng/spot (glycyrrhetinic acid) and 10-50 ng/spot (piperine). Recovery was 96.3-98.6 %.

Phytochem. Anal. 20, 421-426 (2009). HPTLC of delta-9-tetrahydrocannabinol in the flowertops of Cannabis sativa on silica gel with chloroform with chamber saturation for 20 min. Quantitative determination by absorbance measurement at 206 nm. Derivatization by dipping in Fast Blue B solution for 5 s. The hRf value of delta-9-tetrahydrocannabinol was 47 and selectivity regarding matrix was given. Linearity was given between 50 and 500 ng/zone. The limit of quantification and detection was 50 and 10 ng/zone, respectively. The intra- and inter-day repeatability (%RSD, n = 9) were not higher than 5.0 %. Recovery was 85.8 % for delta-9-tetrahydrocannabinol in decarboxylated Cannabis samples. The method was shown to be comparable within a small degree of error (0.5 %) to results from a validated HPLC method.

J. Planar Chromatogr. 22, 417-420 (2009). HPTLC of escitalopram oxalate and clonazepam on silica gel, prewashed with methanol, in a twin trough chamber saturated for 20 min at 25 °C with methanol - toluene - triethylamine 10:35:1. Quantitative determination by absorbance measurement at 253 nm.

Abstract No. F-244, 61st IPC (2009). HPTLC of rabeprazole and itopride on silica gel with ethyl acetate - methanol - benzene - chloroform 2:4:3:1. The hRf value was 42 and 61 for rabeprazole and itopride, respectively. Quantitative determination by absorbance measurement at 276 nm. The method was linear in the range of 200-300 ng/band for rabeprazole and 1500-2250 ng/band for itopride.

Abstract No. F-274, 61st IPC (2009). HPTLC of ondansetron HCl on silica gel with chloroform - ethyl acetate - methanol - 25 % ammonia 90:50:40:1. The hRf value was 52. Quantitative determination by absorbance measurement at 254 nm. The method was linear in the range of 100-1400 ng/band. Recovery was 99.3 %.