J. Planar Chromatogr. 17, 454-458 (2004). HPTLC of lipids and phospholipids (tricylglycerols, free sterols, free fatty acids, steryl esters, phosphatidylcholine, phosphatidylethanolamine) on silica gel with petroleum ether - diethyl ether - glacial acetic acid 80:20:1 in a presaturated twin-trough chamber. Detection by spraying with 5 % phosphomolybdic acid in ethanol, followed by heating for 10 min at 115 °C. The neutral lipids are visible as blue spots on a yellow background. For polar lipid analysis, plates were developed with chloroform - methanol - water 65:25:4 and sprayed with 10 % cupric sulfate, followed by heating for 10 min at 140 °C, to detect phospholipids as brown spots on a white background. Quantitative determination by densitometric analysis at 610 nm for neutral lipids and at 370 nm for polar lipids.

56th IPC 2004, Abstract No. GP-46. Stability indicating HPTLC determination of cefuroxime axetil in bulk drug and in formulations on silica gel with chloroform - methanol 23:2. Quantitative determination by scanning at 278 nm. The sample was subjected to acidic, and alkali hydrolysis, oxidation and photo degradation. The degraded products were well separated. The method was validated for accuracy, precision, linearity, specificity, ruggedness, and recovery (98 - 100 %).

IPC 56th 2004, Abstract No. G-5. HPTLC of conessine in Holarrhena antidysentrica, an important ayurvedic drug, on silica gel with toluene - ethyl acetate - diethyl amine 13:5:2. Detection by spraying with Dragendroff’s reagent. Quantitative determination by densitometric scanning at 520 nm. Different market samples of the drug were found to contain 0.30 - 1.46 % of conessine with recovery of 95.18 - 102.70 %

J. Planar Chromatogr. 17, 238-240 (2004). HPTLC of aceclofenac and mosapride citrate (as internal standard) on silica gel in a twin-trough chamber equilibrated with the mobile phase with toluene - methanol - ethyl acetate - glacial acetic acid 550:250:200:1. Quantitative determination by densitometry at 284 nm.

J. AOAC Int. 88, 1516 (2005). Short overview on the use of densitometry in thin-layer chromatography as one of the most active areas in TLC research. See also the biennial reviews of Planar Chromatography by J. Sherma in Anal. Chem 74, 2653-2662 (2002) and 76, 3251-3261 (2004).

J. Planar Chromatogr. 18, 400-402 (2005). HPTLC of beta-carotene on silica gel and RP-18 with preadsorbent sample-application zones (prewashed with dichloromethane - methanol 1:1) with petroleum ether (35-60 °C) - acetonitrile - methanol 1:2:2 or petroleum ether (20-40°C) - acetone 7:3. HPTLC of biliverdin on silica gel with n-butanol - methanol - water 4:2:3. Quantitative determination by absorbance measurement at 628 nm.

J. Planar Chromatogr. 18, 269-273 (2005). HPTLC of flavonoids (hyperoside, isoquercitrin, luteolin, luteolin 7-O glucoside, rutin, vitexin, quercetin, quercitrin as standards) and phenolic acids (caffeic and chlorogenic acid) on silica gel after presaturation with ethyl acetate - acetic acid - formic acid - water 100:11:11:26. Detection by spraying with natural products reagent, followed by spraying with PEG. Visualization under UV light at 254 and 366 nm. Quantitative evaluation by video-densitometry.

J. AOAC Int. 88, 1517-1524 (2005). HPTLC of fenofibrate and gemfibrozil on diol phases in horizontal chambers using the sandwich technique with hexane - tetrahydrofuran 4:1. Quantitative determination by classical densitometry at 227 nm and videodensitometry at 254 nm. Recovery in the densitometric assay was 101.4 % for fenofibrate and 100.5 % for gemfibrozil. Videodensitometry resulted in recoveries of 102.7 % and 98.8 %, respectively.