J. Planar Chromatogr. 23, 265-269 (2010). TLC of the epimers of cefaclor on silica gel (impregnated with beta-cyclodextrin by development with 1:9 aqueous beta-cyclodextrin solution - methanol) with chloroform - ethyl acetate - glacial acetic acid - water 4:4:4:1 with chamber saturation. Chromatograms were developed at 5 °C and dried at room temperature. Quantitative determination by absorbance measurement at 274 nm. The limit of detection was 0.24 and 0.27 µg/band for the epimers at hRf 26 and 33, respectively. The limit of quantification was 0.74 and 0.83 µg/band, respectively. The recovery was between 100.0 and 100.8 % and the precision between 0.7 and 1.7 %.

Journal of Pharmacy Research 2(5), 789-791 (2009). TLC of harmaline in methanolic leaf extracts of Passiflora foetida on silica gel with chloroform - acetone - diethylamine 5:4:1. The hRf value of harmaline was 76. Densitometric quantification at 351 nm. The plant was found to contain 0.75 % w/w of harmaline. The method was linear in the range of 1-10 µg/band.

J. AOAC Int. 93, 1222-1227 (2010). HPTLC of rosuvastatin (ROS) and ezetimibe (EZE) on silica gel with n-butyl-acetate - chloroform - glacial acetic acid 1:8:1 with chamber saturation for 30 min. Quantitative determination by densitometry at 245 nm. The hRf value of ROS was 30 and of EZE 58. The linearity for ROS and EZE was 0.1 to 0.9 µg/zone.The intraday and interday precision was 0.62 % and 0.73 % for ROS and 0.59 % and 0.69 % for EZE (n=3). The LOD values for ROS and EZE were found to be 0.04 and 0.07 µg/spot, respectively, and their LOQ values were 0.07 and 0.1 µg/spot, respectively. The recovery study results ranged from 98 to 101 % for ROS and EZE.

F-247 (2010). TLC of aceclofenac and thiocolchicoside on silica gel with methanol – chloroform – water 48:1:1. The hRf values were 70 and 83 for thiocolchicoside and aceclofenac, respectively. Quantitative determination by absorbance measurement at 254 nm. The method was linear in the range of 30-180 ng/band for thiocolchicoside and 750-4500 ng/band for aceclofenac. The recovery was in the range of 99.2-100.0 % for both drugs.

62nd Indian Pharmaceutical Congress Abstract No. F-233 (2010). TLC of metoprolol and ramipril on silica gel with methanol – toluene – ethyl acetate – ammonia 25:30:50:7. Quantitative determination by absorbance measurement at 209 nm. The hRf values of metoprolol and ramipril were 67 and 37, respectively. The reliability of the method was assessed by evaluation of linearity (2-12 µg/band for metoprolol and 0.2-1.2 µg/band for ramipril).

F-255 (2010). TLC of irbesartan on silica gel with ethyl acetate – toluene – glacial acetic acid 35:15:1. Quantitative determination by absorbance measurement at 240 nm. The method was linear in the range of 200-800 ng/band. The sample was subjected to different stress conditions (acid, alkali, oxidation, thermal & photolytic). The compound was well separated from the different degradation products and could be estimated without any interference from the degradation product. The proposed stability indicating assay method was found suitable for routine quality control.

62nd Indian Pharmaceutical Congress Abstract No. F-254 (2010). TLC of amlodipine besylate and telmisartan on silica gel with ethyl acetate – methanol – 25 % ammonia – glacial acetic acid 75:15:1:2. The hRf value was 34 and 60 for amlodipine besylate and telmisartan, respectively. Quantitative determination by absorbance measurement at 226 nm. The linearity was in the range of 500-6000 ng/band for amlodipine and 1000-8000 ng/band for telmisartan. The sample was subjected to various stress conditions and all the degradation products were well resolved from the pure drugs. The method can be used for stability studies.

62nd Indian Pharmaceutical Congress Abstract No. F-265 (2010). TLC of cholesterol on silica gel with carbon tetra chloride – methanol – formic acid 270:30:11. The hRf value was 55. Quantitative determination by absorbance measurement at 366 nm. The method was linear in the range of 100-600 ng/band.