Anal. Chem. 81, 8426-8433 (2009). HPTLC of zeaxanthin, cryptoxanthin, beta-carotene, lutein and pollen extracts on silica gel with tetrahydofuran - methylene chloride - n-hexane by automated multiple development. Quantitative determination by absorbance measurement at 425 nm, which has to be accomplished within 5 min after development due to the fast bleaching of the carotenoid color. The analysis of carotenoids in pollen extracts was confirmed by resonance Raman data measured directly on the HPTLC plates.

Abstract No. 9226, IHCB (2009). HPTLC of oleanolic acid (in extracts of Ocimum sanctum collected from different geographical sources) on silica gel with toluene - ethyl acetate - glacial acetic acid 55:45:2. Detection by spraying with Liebermann-Burchard’s reagent. Quantitative determination by absorbance measurement at 600 nm. Linearity was in the range of 1-4 µg, recovery was 100.4-102.1 %. Hydro alcoholic extracts of the plant contained high amounts of oleanolic acid, maximum contents were found in plants collected in the Kerala region.

J. Planar Chromatogr. 22, 235-240 (2009). HPTLC of pesticides (clofentezine, neburon, chlorfenvinphos, lenacyl, trifluralin, thiram, procymidone, flufenoxuron, tralkoxydim, propaquizafop, dinoseb) and water samples (sample preparation by solid phase extraction) on silica gel with ethyl acetate - n-heptane 1:4 and 3:7 in a horizontal chamber. Quantitative determination by diode array densitometry in the range of 200 to 600 nm. The limit of detection was between 40 and 650 ng/spot and the limit of quantification was between 120 and 1920 ng/spot.

Br. root powder and extract. J. Planar Chromatogr. 22, 453-456 (2009). HPTLC of 2-hydroxy-4-methoxybenzaldehyde and biological extracts on silica gel with toluene - ethyl acetate - acetic acid 7:2:1 in a twin trough chamber saturated for 20 min. Quantitative determination by absorbance measurement at 277 nm.

60th Indian Pharmaceutical Congress PA-212 (2008). HPTLC of atomoxetine HCl on silica gel with acetone - methanol - triethylamine 30:15:2. Quantitative determination by absorbance measurement at 275 nm. The method was linear in the range of 300-2100 ng/spot and was suitable for routine quality control of pharmaceutical formulations.

J. Planar Chromatogr. 22, 349-354 (2009). HPTLC of flurbiprofen (2-(3-fluoro-4-phenyl)phenylpropanoic acid) and degradation products on silica gel, prewashed with methanol, with chloroform - acetone - xylene 5:2:1 in a twin trough chamber saturated for 20 min. Quantitative determination by absorbance measurement (the authors report no wavelength). Linearity was between 50 and 600 ng/band. The limit of detection and quantification was 10 and 32 ng/band, respectively.

Abstract No. F-320, 62st IPC (2009). HPTLC of ezetimibe on silica gel with ethyl acetate - toluene - methanol - formic acid 10:10:1:1. Quantitative determination by absorbance measurement at 231 nm. The method was linear in the range of 301-3610 ng/band. Recovery was 99.3-100.4 % The drug was exposed to different stress conditions (acid, base, oxidative, thermal) and all degradation products were well resolved from the main compound.

J. Planar Chromatogr. 22, 359-362 (2009). HPTLC of aloenin in aloe juice, tablets, and liquid extracts on silica gel with ethyl acetate - 95 % ethanol - water 20:3:1 at room temperature in a saturated chamber. Detection by immersion for 1 s in freshly prepared 5 % sodium hydroxide solution in 95 % ethanol, followed by heating at 100 °C for 5 min. Quantitative determination by absorbance measurement at 365 nm.