Abstract No. F-395, 61st IPC (2009). HPTLC of domperidone and paracetamol on silica gel with acetone - toluene - methanol 2:2:1 with chamber saturation at room temperature. The hRf value was 52 and 74 for domperidone and paracetamol, respectively. Quantitative determination by absorbance measurement at 248 nm (paracetamol) and 285 nm (domperidone). The method was linear in the range of 16-48 ng/band. Recovery was 99.5-101.2 %.

J. Planar Chromatogr. 22, 283-286 (2009). HPTLC of withaferin and extracts of the powdered root on silica gel, prewashed with methanol, with toluene - ethyl acetate - acetone 2:3:3 in a twin trough chamber saturated with mobile phase for 30 min. Detection by spraying with anisaldehyde reagent followed by heating for 15 min at 105 °C; characteristic orange fluorescence was observed for whithaferin. Quantitative determination by absorbance measurement at 214 nm. The limit of detection and quantification for withaferin A was 258 and 782 ng/zone, respectively.

Abstract No. F-271, 61st IPC (2009). HPTLC of telmisartan and rampril on silica gel with methanol - chloroform 1:6. The hRf value was 38 and 68 for rampril and telmisartan, respectively. Quantitative determination by absorbance measurement at 210 nm. The sample was exposed to different stress conditions (acid, alkali, oxidative, photo degradation and thermal). Both drugs did not degrade under acidic and photolytic conditions, but showed significant degradation under alkaline and thermal conditions. Both compounds were well separated from different degradation products under experimental conditions.

60th Indian Pharmaceutical Congress PA-231 (2008). HPTLC of voriconazole on silica gel with toluene - ethyl acetate 1:3. Quantitative determination by absorbance measurement at 255 nm. The linearity range was 10-1200 ng/spot, recovery was 99.5 %. The method was suitable for routine quality control of formulations.

J. Planar Chromatogr. 22, 399-403 (2009). TLC of celecoxib, etoricoxib, and valdecoxib on silica gel with chloroform - acetone - toluene 12:5:2 with chamber saturation for 15 min at room temperature. Quantitative determination by absorbance measurement at 254 and 290 nm.

Chinese J. Pharm. Anal. 28 (4), 608-610 (2008). TLC of hyperoside in the raw extract of Hypericum perforatum on silica gel with petroleum ether (60-90 °C) – ethyl acetate – methanol 1:4:2. Detection under daylight. Quantification by densitometry at 591 nm. Linearity was given between 0.1 and 14.4 µg/spot (r2 = 0.9892), recovery was between 96.4 and 100.1 %.

Abstract No. C-338, 61 IPC (2009). HPTLC of gallic acid and piperine in combined formulation on silica gel with toluene - ethyl acetate - formic acid 16:8:1. Quantitative absorbance measurement at 320 nm. The method was linear in the range of 200-800 ng/band for gallic acid and 50-350 ng/band for piperine.

J. Planar Chromatogr. 23, 208-211 (2010). HPTLC of prednisolone (and hydrocortisone as impurity) on silica gel (prewashed with methanol) with chloroform - methanol 19:1 in a twin-trough chamber previously saturated for 30 min. Quantitative determination by scanning densitometry at 250 nm. Linearity was in the range of 2-10 µg/band (r = 0.9967, calculated via peak area). LOD and LOQ was 200 and 600 ng/spot, respectively. Recovery was 100.0 % for prednisolone. Repeatability was 0.74 % and the inter-day (n = 6) and intra-day (n = 12) precision was 2.6 and 2. 7 %, respectively.