Indian J. Pharma Educ. Res. 42(1), 32-35 (2008). HPTLC of metoprolol succinate on silica gel with toluene - methanol - triethylamine 30:50:3. Quantitative determination by absorbance measurement at 274 nm. The hRf value was 40. The method was linear in the range of 5-10 ng/spot. The limit of detection and quantification was 430 ng/spot and 1310 ng/spot respectively. The method was suitable for routine quality control.

J. AOAC Int. 91, 1162-1167 (2008). HPTLC of curcumin, demethoxycurcumin, and bisdemethoxycurcumin as standards on silica gel prewashed with methanol using chloroform - methanol 97:3 in a twin-trough chamber at 23 °C and 31 % relative humidity. Quantitative determination by absorbance measurement at 430 nm.

Asian J. Chem. 19(6), 4183-4187 (2007). HPTLC of atenolol and indapamide in tablet formulation on silica gel with toluene - ethanol - acetone - acetic acid 70:25:30:3. Quantitative determination by absorbance measurement at 266 nm. The hRf value of atenolol and indapamide was 21 and 74, respectively. The linearity range was 3.8-10.9 ng/spot and 0.2-0.6 ng/spot for atenolol and indapamide respectively. The recovery was in the range of 98.7-100.1 % for both compounds.

Chromatographia 68 (9-10), 877-880 (2008). TLC of betulinic acid in Nymphoides macrospermum on silica gel with hexane - ethyl acetate - acetic acid 700:300:3. Detection by spraying with anisaldehyde-sulphuric acid reagent. Quantification by absorbance measurement at 540 nm. Linearity was in the concentration range of 100–600 ng/spot. The method is suitable for the routine quality control of Granthika Tagara.

Indian Drugs 45(8), 663-666 (2008). HPTLC of geranial and luteolin from leaves of Cymbopogon citratus on silica gel with toluene - ethyl acetate 9:1 for geranial and toluene - ethyl acetate - formic acid 10:7:1 for luteolin. Densitometric evaluation at 200 nm (geranial) and 254 nm (luteolin). Alcoholic extracts of the plant leaves were found to contain 1.34 % and 1.49 % of geranial and luteolin respectively.

J. Pharm. Res. (7)4, 229-232 (2008). HPTLC of lumefantrine and artemether on silica gel with toluene - ethyl acetate - formic acid 60:60:7. Quantitative determination by absorbance measurement of lumefantrine at 267 nm and of artemether at 561 nm. The hRf value for lumefantrine was 54 and of artemether 89. Linearity was in the range of 1200-6000 ng/spot for lumefantrine and 200-1000 ng/spot for artemether. The method was successfully applied to the analysis of commercial formulations.

J. Planar Chromatogr. 21, 337-341 (2008). HPTLC of phospholipids (cholesterol, phosphatidylethanolamine, phosphatidylcholine, and lysophosphatidylcholine) on silica gel plates with a concentration zone (prewashed with dichloromethane - methanol 1:1) with chloroform - methanol - water 65:25:4 in a saturated twin trough chamber. Detection by spraying with aqueous copper sulfate reagent followed by heating. Quantitative determination by absorbance measurement at 370 nm. Ninhydrin spray reagent was used to confirm the presence of phosphatidylethanolamine. The limit of quantification was 250 ng/spot.

Acta Chromatographica 21 (1), 83-93 (2009). HPTLC of quetiapine fumarate on silica gel with toluene - methanol 4:1. The hRf value of quetiapine fumarate was 37. Quantitative determination by absorbance measurement at 254 nm. There was no chromatographic interference from tablet excipients. The drug is susceptible to treatment with acid and alkaline hydrolysis, oxidation, and photodegradation. The method was able to separate the degradation products from the pure drug, it can be used for stability tests.