Indian Drugs 44 (2), 111-116 (2007). HPTLC for simultaneous determination of mosapride citrate and pantoprazole from pharmaceutical formulations by using loratadine as an internal standard. HPTLC on silica gel with toluene - acetone - methanol 16:4:1. Quantitative determination by absorbance measurement at 254 nm. Mosapride citrate response was linear over the range 0.075 - 0.225 µg/mL, and that for pantoprazole was 0.2 - 0.6 µg/mL. Recovery was 99.6 - 101.3 % for both compounds. The developed method was validated regarding accuracy, precision, and stability, and can be used for routine quality control of formulations containing mosapride citrate and pantoprazole.

Indian J. Pharm. Sci. 68 (6),788-789 (2007). HPTLC of etorocoxib in dosage forms on silica gel with chloroform - methanol - toulene 2:1:2. The plate was scanned at 289 nm for quantitative evaluation. The hRf value of etorocoxib was 58. The method was linear in the range of 100 - 600 ng/spot.The method was validated for accuracy, precision and repeatability. It was found suitable for routine quality control of formulations.

CBS 97, 6-7 (2006). HPTLC of absinthe (a beverage of the wormwood plant, Artemisia absinthium) on silica gel with acetone - acetic acid (98 %) - toluene - dichloromethane 1:1:3:5 over 70 mm. Detection by dipping in a solution of acetic anhydride - sulphuric acid - ethanol 1:1:10 followed by heating at 104 °C for 5 min. Quantitative determination by absorbance measurement at 554 nm. The hRf value of absinthin was 64 and selectivity regarding matrix was given. Linearity was between 0.1 and 10 g/L. The limit of detection and quantification for absinthin was 0.05 and 0.11 g/L, respectively. The precisions were better than 13.5 % (intraday) and 15.8 % (interday).

J. AOAC Int. 90, 1203-1209 (2007). HPTLC of terpenelactones (total bilobalide, gingkolide A, and gingkolide B) on prewashed and sodium acetate preimpregnated silica gel with toluene - ethyl acetate - acetone - methanol 50:25:25:3 or ethyl acetate - hexane 9:1; also HPTLC of flavonol glycosides (quercetin, kaempferol, isorhamnetin as standards) on prewashed and preimpregnated silica gel with chloroform - acetone - formic acid - acetic acid 50:11:6:6. Plates were developed in solvent equilibrated, vapor saturated twin-trough chambers at 30°C. Densitometry in absorbance mode at 370 nm (for aglycones) and at 290 nm following a 1 s immersion in acetic anhydride and heating at different temperatures for varying lengths of time (for terpenelactones). Good relationship (95%) was determined between HPTLC and HPLC for determination of total flavonol glycosides. The HPTLC flavonol aglycone method also performed well in terms of accuracy and consecutive plate repeatability.

59th Indian Pharmaceutical congress F-154, 426, 2007. HPTLC of atorvastatin calcium and amlodipine besylate on silica gel with ethyl acetate - 1,4-dioxane - methanol - ammonia 10:1:2:1. Quantitative evaluation by densitometry at 254 nm. The hRf value was 35 and 56 for atorvastatin and amlodipine, respectively. Linearity was between 200 and 1000 ng/zone for atorvastatin and 400 and 2000 ng/zone for amlodipine. Recovery was 99.8 - 100.9 % for both compounds. The method was found suitable for routine quality control of formulations containing both drugs in combined formulations.

59th Indian Pharmaceutical Congress C-176, 267, (2007). HPTLC of tylophorine, kaempferol, alpha-amyrin, and quercetin in an alcoholic extract from Tylophora indica on silica gel with ethyl acetate - formic acid - glacial acetic acid - water 100:11:11:26. Densitometry at 366 nm. The method was found suitable for the estimation of quercetin in plant drugs and their formulations.

Indian J. Pharm. Sci. 69(4), 589 (2007). HPTLC of ropinirole on silica gel with methanol - acetone 4:1. Aripiprazole was used as internal standard. Under chromatographic conditions both ropinirole and aripiprazole were well separated. Evaluation under UV 254 nm. UV spectrometry was carried out at 250 nm.

J. Chromatogr. Sci. 46 (1), 4-9 (2008). Presentation of a simple and accurate stability-indicating method for the quantitative determination of ribavirin in its bulk and capsule forms by TLC on silica gel aluminium layer with chloroform – methanol – acetic acid 4:1:1. Detection by spraying with anisaldehyde reagent. Ribavirin is found to undergo degradation under all stress conditions, and the degradation products are well resolved from the pure drug with significantly different Rf values. Linearity was between 5 and 40 µg/spot (r = 0.9980). The limit of detection and of quantification was 1 and 5 µg/spot, respectively. Application of the proposed TLC method for the determination of ribavirin in pure form and in capsules, with good accuracy and precision. The results obtained by the proposed TLC method are comparable with those obtained by the official method.