Indian J. Pharm. Sci. 68 (6),788-789 (2007). HPTLC of etorocoxib in dosage forms on silica gel with chloroform - methanol - toulene 2:1:2. The plate was scanned at 289 nm for quantitative evaluation. The hRf value of etorocoxib was 58. The method was linear in the range of 100 - 600 ng/spot.The method was validated for accuracy, precision and repeatability. It was found suitable for routine quality control of formulations.

Pharm. Res. 23, 2024-2029 (2006). HPTLC of the chloroform extract of a lipophilic model drug (tempol benzoate) into a long-chain triacylglyceride (olive oil) after 0, 5, 20 and 45 min of digestion with pancreatin on silica gel, by AMD using an 11 step gradient based on hexane and ethyl acetate. Detection by spraying with an aqueous copper sulfate solution (10 % copper sulfate, 8 % phosphoric acid, 5 % methanol), followed by heating at 150 °C. Quantitative determination by absorbance measurement at 675 nm. Lipid recovery was between 104 and 119 %.

J. Planar Chromatogr. 20, 43-48 (2007). Two dimensional TLC of flavonoids (with quercetin 3-rhamnoside, quercetin 3-glucoside, quercetin 3-rutinoside, catechin, and gallic acid as markers) on cellulose with n-butanol - acetic acid - water 6:4:1 in the first direction and 15 % acetic acid in the second direction; TLC of phenolic acids on cellulose with toluene - methanol - acetic acid - acetonitrile 16:2:1:1 in the first direction and sodium formate - formic acid - water 10:1:200 in the second direction. Flavanols were separated on silica gel with chloroform - methanol - water 13:7:2 in the first direction and ethyl acetate - formic acid - acetic acid - water 75:3:2:20 in the second direction. Chromatograms were developed in a horizontal chamber after saturation for 10 min. Detection after drying by UV light at 254 and 366 nm. Detection also by spraying with 5 % aluminium chloride in methanol for flavonoids, with aqueous 5 % iron(III) chloride for gallic acid,1 % diazosulfanilamide in acetone and 1 % vanillin in hydrochloric acid for flavanols. After spraying with vanillin solution plates were heated at 110 °C for 5 min and viewed in white light and, after 30 min, under UV light at 366 nm. Also TLC of flavonoids (astragalin, quercetin 3-galloylglucoside, rutin, hyperoside, quercitrin, kaempferol 3-rhamnoside on silica gel with ethyl acetate - methanol - formic acid - acetic acid - water 80:10:1:1:8. For an identity test natural product reagent, 0.5% diphenylborinic acid 2-aminoethylester in ethyl acetate, was used. After develoment the plates were heated at 100 °C for 3 min and immediately immersed in the NP reagent, then viewed under UV light at 366 nm and in white light.

Chromatographia 67 (1-2), 101-107 (2008). HPTLC of simvastatin and ezetimibe on silica gel with n-hexane – acetone 3:2. Quantification by densitometry in absorbance mode at 234 nm. The hRf value of simvastatin was 39 and of ezetimibe 50. Linearity was between 200 and 1600 ng/spot with correlation coefficients r2 = 0.9917 for simvastatin and r2 = 0.9927 for ezetimibe. Limits of detection and quantitation were 25 and 150 ng per band, respectively. For investigation of stability simvastatin and ezetimibe were subjected to acid, pH 6.8 phosphate buffer, oxidation, dry heat, and wet heat. The degradation products were well resolved from the pure drug, therefore the method could be effectively used for stability-indicating analysis.

59th Indian Pharmaceutical Congress C-43, 234, (2007). HPTLC of Z-guggulsterone (a steroidal ketone present in oily resin of Commiphora mukul) and five marketed ayurvedic tablet formulations containing guggul, on silica gel with toluene - propane-1-ol - glacial acetic acid 8:1:1. Densitometry at 254 nm. The hRf of E-guggulsterone was 55. Several marketed formulations were evaluated for Z-guggulsterone, the UV spectra of the standard and that of the formulations were comparable in respect of Z-guggulsterone.The method was found suitable for evaluation of Z-guggulsterone in presence of other phytochemicals present in formulations.

by TLC. Chromatographia 66 (7-8), 631-634 (2007). TLC of heraclenin and heraclenol in the roots of Heracleum candicans D.C. on silica gel with toluene - ethyl acetate 7:3. Quantitative determination by densitometry at 366 nmn. Linearity was between 4 - 10 µg/zone for heraclenin and 1 - 5 µg/zone for heraclenol.

59th Indian Pharmaceutical congress C-324, 302, (2007). HPTLC of aqueous and alcoholic extracts of different plant parts (fruits, leaves, stem and root) of Solanum xanthocarpum and Solanum trilobatum, on silica get with toluene - ethyl acetate - diethyl amine 7:2:1. Detection at 254 nm and 366 nm, and by spraying with antimony tretrachloride and vanilin - sulphuric acid.

Pharmazie 63, 405-407 (2008). TLC of (+)-haemanthamine on silica gel or on RP-18. Detection by spraying with Dragendorff reagent or with 1 % cerium sulfate - sulfuric acid, followed by heating.