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-220, 277, (2007). HPTLC of gallic acid in fruits of Emblica officinalis, on silica gel with touene - ethyl acetate - acetic acid - formic acid 4:9:4:3. Densitometry at 277 nm for quantitative evaluation. The method was linear in the range of 10 and 1000 ng/mL, with an average recovery of 101.4 %. The method was found suitable for routine quality check-up of Emblica officinalis.

59th Indian Pharmaceutical Congress C-66, 240, (2007). Evaluation of Arjunakhseerpak and Arjunaristha, two ayurvedic formulations used for cardiovascular system, which contain Terminalia arjuna as the main ingredient. Simultaneous HPTLC of arjungenin and arjunolic acid from Terminalia arjuna on silica gel with toluene - ethyl acetate - acetic acid 10:10:1. Detection by spraying with 10 % sulphuric acid followed by heating. Densitometric evaluation at 366 nm. The UV spectra of the sandards arjungenin and arjunolic acid was found to be similar to that of arjungenin and arjunolic acid in the formulation. The method was found suitable for standardization of arjuna formulations.

J. Planar Chromatogr. 20, 139-140 (2007). HPTLC of eugenol (4-allyl-2-methoxyphenol) on silica gel with heptane - ethyl acetate 3:2 in normal, unsaturated chambers. Visualization under UV light at 254 nm.

J. Planar Chromatogr. 20, 73-74 (2007). HPTLC of hedychenone (a trimethyldecalin terpene) on silica gel with n-hexane - ethyl acetate 4:1 in a saturated twin-trough chamber. After development the plates were dried at 105 °C for 20 min. Densitometric evaluation in absorbance mode at 254 nm.

J. Chromatogr. Sci. 46 (6), 560-564 (2008). Quantitative TLC is performed with a digital imaging system with simple equipment and software. The method was used for the quantitative assay of cichoric acid in Echinacea purpurea. TLC on polyamide phase with chloroform - methanol - formic acid - water 3:6:1:1. Detection by spraying with 3 % aqueous aluminum chloride solution. Images of chromatograms were acquired with a standard digital camera under a UV lamp at 365 nm in a dark room. The three-dimensional grayscale digital image dataset (x, y, gray) was reduced to a two-dimensional dataset (distance, accumulative gray) and then plotted as a curve. For quantification the area under the curve (corresponding to cichoric acid) was integrated.

Chromatographia 67 (5-6), 487-490 (2008). Simultaneous determination of escitalopram oxalate and clonazepam in a combined tablet dosage form by HPTLC on silica gel aluminum plates with toluene - ethyl acetate - triethylamine 14:7:6. Quantification by densitometry at 258 nm.

J. of Pharm. Biomed. Anal. 44 (3), 812-817 (2007). HPTLC of extracts of Notopterygium incisum Ting ex H.T. Chang (or Notopterygium forbesii Boiss) root and rhizome, and marker compounds isoimperatorin, notopterol and bergapten. The authentication of rhizoma et radix Notopterygii was achieved by comparing the colors and Rf values of the bands in TLC fingerprints with those of the marker compounds. The HPLC fingerprints of 16 batches of herbal samples from different regions of China showed similar chromatographic patterns. Five peaks were selected as characteristic peaks, and three of these were identified by using LC-MS-MS techniques.