Ind. J. of Pharma Sci. 70(6), 844-847 (2008). HPTLC of plumbagin in alcoholic root extracts of Plumbago indica and Plumbago zeylanica on silica gel with n-hexane - ethyl acetate 4:1. The hRf value of plumbagin was 67. Quantitative determination by absorbance measurement at 265 nm. Plumbago indica showed significantly higher plumbagin contents than P. zeylanica. The HPTLC method was the method of choice for simultaneous analysis of several samples, whereas the RP-HPLC method was very sensitive.

Alpha-hydroxybutyric and mandelic acids. J. Planar Chromatogr. 22, 241-248 (2009). TLC of alpha-hydroxybutyric acids and mandelic acid on silica gel, prewashed with methanol - water 9:1 and impregnated by dipping for 2 s in 0.05 g/L aqueous copper acetate solution, with dioxane - water 9:1 at 22 +/- 2°C. Quantitative determination by absorbance measurement during 16 days at 326 nm. Spontaneous oscillatory in-vitro chiral conversion was observed for alpha-substituted propionic acids as well as chiral carboxylic acids with two and four carbon atoms.

60th Indian Pharmaceutical congress PA-235 (2008). HPTLC of strychnine and brucine (in seeds of Strychnos Nux Vomica) on silica gel with chloroform - methanol - ammonia 38:2:1. Quantitative determination by absorbance measurement at 258 nm (strychnine, hRf value 29) and 271 nm (brucine, hRf value 21). The method was linear in the range of 100-1000 ng/spot (both compounds). The method was suitable for standardization of several herbal formulations containing nux vomica as an ingredient.

Abstract No. F-280, 61st IPC (2009). HPTLC of nebivolol HCl and hydrochlorothiazide on silica gel with toluene - ethyl acetate - methanol - 25 % ammonia 30:27:17:2. The hRf value was 38 and 68 for hydrochlorothiazide and nebivolol, respectively. Quantitative determination by absorbance measurement at 281 nm. The method was linear in the range of 500-3000 ng/band for nebivolol and 1000-6000 ng/band for hydrochlorothiazide. Recovery was 100 %.

Chinese J. Hospit. Pharm. 29 (8), 686-688 (2009). TLC of the extracts of Yixuean pills on silica gel with 1) chloroform - ethyl acetate - acetone - formic acid 60:25:25:4; 2) n-hexane - chloroform - methanol 15:5:2; 3) ethyl acetate - formic acid - acetic acid - water 15:1:1:2. Detection 1) under UV 254 nm; 2) by exposure to iodine vapor and under UV 254 nm; 3) by spraying with 10 % sulfuric acid in ethanol followed by heating at 105 °C until coloration evaluation under visible light and UV 254 nm.

Abstract No. F-248 61st IPC (2009). HPTLC of benzhexol HCl and trifluperazine HCl on silica gel with methanol - acetone - toluene - 25 % ammonia 10:10:70:1. The hRf value was 37 and 82 for trifluperazine and benzhexol respectively. Quantitative determination by absorbance measurement at 210 nm. The method was linear in the range of 40-800 ng/band for benzhexol and 100-2000 ng/band for trifluperazine. Recovery was 99.7-99.9 % for both compounds.

Abstract No. F-258, 61st IPC (2009). HPTLC of olmesartan medoximal and amlodipine besylate on silica gel with chloroform - methanol - toluene - acetic acid 80:10:1:1. Quantitative determination by absorbance measurement at 254 nm. The linearity range was 800-5000 ng/band for olmesartan and 200-1400 ng/band for amlodipine. Recovery was in the range of 98-102 % for both drugs.

Abstract No. F-311, 61st IPC (2009). HPTLC of levocetirizine dihydrochloride and montelukast sodium on silica gel with chloroform - methanol 93:7. The hRf value was 21 and 65 for levocetrizine and montelukast, respectively. Quantitative determination by absorbance measurement at 345 nm. The method was linear in the range of 100-350 ng/band for levocetrizine and 600-1100 ng/band for montelukast.