J. Pharm. Res. 6(4), 233-235 (2007). HPTLC of ofloxacin and satranidazole on silica gel with n-butanol - ethanol - ammonia 5:5:4. Quantitative determination by absorbance measurement at 320 nm. The method was linear in the range of 200-1000 ng/spot (ofloxacin) and 300-1500 ng/spot (satranidazole) with a recovery of 99.1 - 99.9 % for both component. The hRf value was 54 for ofloxacin and 83 for satranidazole. The method is suitable for routine quality control of raw material and formulations.

60th Indian Pharmaceutical Congress PA-08, (2008). HPTLC of ofloxacin and ornidazole on silica gel with chloroform - methanol - toluene - diethyl amine - water 20:15:25:10:1 in a saturated (20 min) twin trough chamber. Densitometric evaluation at 304 nm. The method was linear in the range of 20-250 ng/µL for both compounds. Recovery was between 100.6 and 101.2 %. The method is suitable for routine quality control.

60th Indian Pharmaceutical Congress PA-87, (2008). HPTLC of carvedilol on silica gel with toluene - chloroform - methanol - acetic acid 20:20:10:1. Densitometric evaluation at 240 nm. The method was linear in the range of 50-1000 ng/spot. The method could effectively separate the drug from its degradation products (acid, base, oxidaline, photodegradation). The kinetic studies confirmed that the drug is more degraded in alkaline medium than in acidic medium.

J. Planar Chromatogr. 22, 83-88 (2009). TLC of isoniazid, pyrazinamide, ethambutol, and aminosalicylic acid on RP-18 in a horizontal chamber at 20 °C with acetonitrile - water 3:7. The mobile phase was modified by adding copper(II) chloride to the mixture at a constant concentration of 0.05 M. Detection under UV light at 254 nm. Quantitative determination by absorbance measurement in the range 200 - 700 nm with a TLC scanner equipped with a diode-array detector.

J. Planar Chromatogr. 22, 175-181 (2009). TLC of 14 tetraoxanes on silica gel with ethyl acetate - toluene and ethyl acetate - petroleum ether, on cyano phase with methanol - water and acetone - water, and on RP-18 with water - organic modifier (methanol, acetone, or dioxane) in various combinations, with chamber saturation for 15 min at ambient temperature (22 +/- 2 °C). Detection by spraying with 50 % sulfuric acid, followed by heating until spots became visible.

Ind. J. Pharma. Sci. 8(4), 198-201(2009). HPTLC of nebivolol hydrochloride and valsartan on silica gel with ethyl acetate - methanol - acetic acid 12:2:1 in a twin trough chamber saturated for 15 min. Quantitative determination by absorbance measurement at 240 nm for valsartan and 280 nm for nebivolol hydrochloride. The method was found to be linear in the range of 600-1400 ng/band for valsartan 1200-2800 ng/band for nebivolol. The sample were subjected to different stress conditions (acid, alkali, oxidation, photolysis, thermal) and all degradation products were well separated from the main compounds.

Abstract No. F-269, 61st IPC (2009). HPTLC of hydrochlorothiazide and irbesartan on silica gel with acetonitrile - chloroform 5:6. The hRf value was 27 and 45 for irbesartan and hydrochlorothiazide, respectively. Quantitative determination by absorbance measurement at 270 nm. The sample was exposed to different stress conditions (acid, alkali, oxidative, photodegradation, thermal). Neither of the compounds showed degradation under thermal and photodegradation conditions, but both compounds showed significant degradation under acid, alkali and hydrolytic conditions. Degraded products were well resolved from the parent compounds.

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 %.