59th Indian Pharmaceutical congress F-10, 392, (2007). HPTLC of olmesartan medoxomil and hydrochlorothiazide on silica gel with acetonitrile - chloroform - glacial acetic acid 14:4:1 with chamber saturation for 30 min. Densitometric evaluation at 254 nm. Linearity was between 480 and 900 ng/zone for olmesartan and 150 and 600 ng/zone for hydrochlorothiazide. Recovery was 99.7 - 100.4 % . The method can be used for routine quality control of formulations.

59th Indian Pharmaceutical Congress F-65, 405, (2007). HPTLC of nebivolol and hydrochlorothiazide in on silica gel with n-butyl-acetate - formic acid - chloroform 7:1:2. Densitometry at 273 nm. The hRf value of nebivolol was 21 and of hydrochlorothiazide 46. Linearity was between 200 and 600 ng/zone for nebivolol and between 500 and 1000 ng/zone for hydrochlorothiazide. The limit of quantification was 60 ng and 40 ng/zone for nebivolol and hydrochlorothiazide, respectively. Recovery was 102 - 105 % for both compounds.

Arzneim.-Forsch./Drug Res. 56, 661-664 (2006). TLC of two biflavones, ochnaflavone and 2’’,3’’-dihydroochnaflavone and two isoflavones, 5,7,4’-trihydroxy-3’,5’-dimethoxyisoflavone (piscigenin) and 5,4’-dihydroxy-7,3’,5’-trimethoxyisoflavone on silica gel with dichloromethane - methanol 9:1. Detection by spraying with methanolic DPPH radical (1,1-diphenyl-2-picryl hydrazyl) solution (20 g/L).

J. Liq. Chromatogr. Relat. Technol. 31, 526-542 (2008). TLC of nicotinic acid, nicotinamide, ethyl, isopropyl, butyl, hexyl, benzyl nicotinate, N-methylnicotinamide, N,N-diethylnicotinamide, 3-pyridinecarbaldehyde, 3-pyridinecarbonitrile, 3-pyridylmethanol, and methyl 3-pyridyl ketone on silica gel and kieselguhr impregnated with 2.5 % and 5 % aqueous solutions of copper(II)sulfate, with acetone - n-hexane in different volume compositions. Detection by spraying with Rhodamine B solution. Quantitation by densitometry. The number of absorption bands of the compounds investigated depends on impregnation of the sorbent and the visualization agent.

J. Chromatogr. A 1216 (7) , 1035-1052 (2009). A review on two-dimensional TLC in the analysis of secondary plant metabolites. Plant extracts are usually very complex mixtures, therefore chromatographic methods are one of the most popular analysis techniques. The separation power of one-dimensional techniques is usually inadequate, therefore in this paper multidimensional planar chromatographic methods are reviewed. General aspects of multidimensionality are discussed. Attention is drawn to the potential of two-dimensional planar chromatography in the field of phytochemistry.

Asian J. Chem. 20(7), 5409 - 5413 (2008). HPTLC of atomoxetine HCl on silica gel with acetonitrile - acetic acid 9:1. Quantitative determination by absorbance measurement at 269 nm. The method was linear in the range of 100-1000 µg/mL. The recovery was 99.8 %. The method was suitable for routine analysis of atomoxetine HCl in its pharmaceutical preparations.

Anal. Chim. Acta 582(1), 75 - 82 (2007). TLC of moxifloxacin both as a bulk drug and from pharmaceutical formulation on silica gel with n-propanol - ethanol - 6M ammonia 4:1:2. Quantification by absorbance measurement at 298 nm. The hRf value of moxifloxacin was 58. Linearity was in the range of 100–800 ng/spot. LOD and LOQ were 3.9 and 11.8 ng/spot, respectively. In stability studies (acid and alkali hydrolysis, oxidation, dry heat, wet heat, photodegradation) degradation products were well resolved from the standard drug. The method was suitable to investigate the kinetics of the acidic and alkaline degradation processes at different temperatures.

Asian J. Chem. 19(6), 4177-4182 (2007). HPTLC of amlodipine and ramipril on silica gel with toluene - acetone - ammonia 70:20:3. Quantitative determination by absorbance measurement at 217 nm via peak height and area. The proposed HPTLC method was suitable for routine analysis of the dosage formulation.