J. Liq. Chromatogr. Relat. Technol. 31, 2019-2034 (2008). TLC of captopril, delapril, enalapril, lisinopril, amd moexipril on silica gel (impregnated by continous development with 10 % paraffin oil in n-hexane for 18 h) and RP-18 with various mobile phases. Detection under UV 254 nm. TLC is a fast and economical method for the determination of lipophilicity.

Chem. 18(1), 667-672 (2006). HPTLC of mefenamic acid and drotaverine HCl in tablets on silica gel with methanol - toluene - triethylamine 10:75:2. Quantitative determination by absorbance measurement at 241 nm. The hRf values were 31 and 47 for mefenamic acid and drotaverine HCl, respectively. The method was validated in terms of accuracy, precision, specificity, ruggedness. Linearity was between 3800 and 8400 ng for mefenamic acid and 1200 and 2700 ng for drotaverine HCl. The recovery (by standard addition method) was in the range of 99.1-100.9 % for both compounds. The method could be used for routine analysis of these compounds and their combined dosage form.

Ind. J. Pharm. Sci. 69 (6), 834-836 (2007). HPTLC of olmesartan medoxomil and hydrochlorothiazide on silica gel with acetonitrile - chloroform - acetic acid 14:4:1. Quantitative determination by absorbance measurement at 254 nm. The calibration curve was linear between 500 and 750 ng/spot for olmesartan medoxomil and between 100 and 600 ng/spot for hydrochlorothiazide. The limit of detection and quantification for olmesartan medoxomil was 170 and 500 ng/spot, and for hydrochlorothiazide 30 and 100 ng/spot. The proposed method can be successfully used to determine the drug content of marketed tablet formulation.

Chromatographia 70 (1-2), 305-308 (2009). Description of color channel selection, three-dimensional visualization, and acquisition time of computerized image analysis for one-dimensional planar separation, known as computerized image analysis or video densitometry. This is an efficient, low-cost technique for quantitative and qualitative analysis of planar separations, e.g. planar chromatography and gel electrophoresis. The image of the TLC plate is captured in black and white, then the proper color channel of the image is selected in order to enhance the signal-to-noise ratio. To facilitate image evaluation a three-dimensional visualization of the planar image was applied by use of OpenGL technology. It was found that the sensitivity is increased by use of longer acquisition times whereas linearity of quantitative analysis is reduced.

Ind. J. Pharm. Sci. 70(5), 644-647 (2008). HPTLC of meloxicam on silica gel with ethyl acetate - cyclohexane - glacial acetic acid 325:175:1 with chamber saturation for 45 min. Quantitative determination by absorbance measurement at 353 nm. The method was linear in the range of 100-500 ng/zone, recovery was 100.3 %. The method was evaluated for stability (acid, base, thermal, oxidative, photodegradation) and degradation products were well separated from the main drug.

Ind. J. Pharma Sci. 70(6), 798-800 (2008). HPTLC of plumbagin in Drosera burmannii Vahl on silica gel with toluene - glacial acetic acid 55:1 (for alcoholic extracts) and toluene - chloroform - glacial acetic acid 10:10:1 (for aqueous extracts) with chamber saturation for 60 min. Evaluation in visible light at 425 nm. The alcoholic extract showed seven components, the main zone with hRf value of 56 corresponded to plumbagin. The aqueous extract showed two zones but no plumbagin.

J. Chinese Trad. Patent Med. 30 (11), 1635-1638 (2008). TLC of Sanjin Ganmao pill extracts on silica gel with 1) chloroform - methanol 17:3; 2) chloroform - methanol - formic acid 35:5:2; 3) chloroform - methanol - formic acid 90:10:1. Detection 1) by spraying with 10 % sulfuric acid in ethanol and heating; 2) by exposure to ammonia vapor. Identification by comparison with the standard hyperin and other standards of the component drugs.

by HPTLC. Abstract No. 9191, IHCB (2009). HPTLC of (-)hydroxy citric acid (the main constituent of Garcinia gummigutta fruits) on silica gel with n-propanol - water - glacial acetic acid 50:50:1. Quantitative determination by absorbance measurement at 210 nm. The hRf value was 46. The method was linear in the range of 100-1000 ng/spot, recovery was 99.8-100.9 %.