J. Planar Chromatogr. 18, 372-376 (2005). HPTLC of sildenafil in four commercial products and three aphrodisiac herbal preparations on silica gel after pre-saturation with chloroform - methanol - diethylamine 90:10:1. Quantitative determination by absorbance measurement at 305 nm. Recovery was 100.6 and 98.2 % for pure and spiked samples.

J. Chinese Trad. Patent Med. (Zhongchengyao) 27(5), 529-532 (2005). TLC of extracts on silica gel developed with 1) ethyl acetate - ethanol 4:1; 2) ethyl acetate - methyl ethyl ketone - formic acid - water 10:1:1:1; 3) cyclohexane - acetone 10:3. Detection 1) under UV 254 nm; 2) by spraying with 5 % AICl3 in ethanol followed by heating at 105 ºC for 5 min, and inspection under UV 365 nm; 3) by spraying with 5 % vanillin in H2SO4 followed by heating at 105 ºC until the spots are visualized. Identification by fingerprint technique. Quantification of ginsenoside Rg1 by HPLC. The results for three real life samples are given.

J. AOAC Int. 88, 70-79 (2005). HPTLC of haloperidol, amitriptyline, sulpiride, promazine, fluphenazine, doxepin, diazepam, trifluoperazine, clonazepam, and chlorpromazine in 25 selected psychotropic drugs on silica gel with 30 mobile phases, eight of them were selected based on spot location and developing time. Identification and quantification were carried out based on UV densitometric measurements. In addition to retention factors, the absorption spectra recorded directly from chromatograms were also used in qualitative analysis. Limit of detection ranged from 0.009 to 0.260 µg depending on the wavelength used. A satisfying recovery, ranging from 92.9 to 104.7 %, was achieved for individual constituents.

J. Planar Chromatogr. 18, 194-198 (2005). HPTLC of rosuvastatin calcium (with aceclofenac as internal standard) on silica gel with toluene - methanol - ethyl acetate - formic acid 60:10:30:1. Quantitative determination by absorbance measurement at 265 nm. A good determination coefficient (r2 = 0.9999) was obtained for the linearity in the range of 1.0 to 15.0 µg of sample. For formulation and bulk drug the mean percentage assay was 100.09 +/- 0.20 and 100.07 +/- 0.48, respectively. The accuracy of the method was found to be 100.62 % and precision was found to vary from 0.01 to 0.77 %.

Indian Drugs 42 (6), 340-344 (2005). HPTLC of captopril and hydrochlorothiazide in tablets on silica gel with methanol - toluene - ethyl acetate - glacial acetic acid 2:12:6:1. Quantitative determination by absorbance measurement at 219 nm. The Rf value of hydrochlorothiazide was 0.38 and of captopril 0.57. The calibration curve response was 4-14 µg for both drugs. Recovery was determined by standard addition method. The percent recovery by area was found to be 100.25 for captopril and 99.98 for hydrochlorothiazide. The method was suitable for routine quality control of such formulations.

Indian J. Pharm. Sci. 67 (3), 351-355 (2005). HPTLC of carbamazepine, phenytoin, and phenobarbitone in tablets on silica gel with toluene - acetone 5:2. Quantification by absorbance measurement at 217 nm. This method was quantitatively evaluated in terms of linearity, accuracy, precision, repeatability and specificity proving its utility in estimation of drug content in tablet dosage form.

J. Chinese Trad. Patent Med. (Zhongchengyao) 27 (7), 783-785 (2005). TLC of ecdultin in Bazi Bushen capsules on silica gel with benzene - ethyl acetate 30:1. Detection under UV 365 nm. Quantitative determination of ecdultin by fluorescence measurement at 320 nm. Validation of the procedure by investigation of the optimum excitation wavelength; linearity range (0.022 - 0.13 µg/spot, R = 0.9998); repeatability (1.5 %, n = 6); precision (0.87 %, n = 6 within plate and 1.42 %, n= 6 plate-to-plate); and standard addition recovery (98.7 %, RSD = 1.83 %, n = 6). The results for six batches of real life samples are given.

C. Cheng by thin-layer chromatography) (Chinese). Chinese J. Pharm. Anal. (Yaowu Fenxi Zazhi) 25 (6), 719- 721 (2005). TLC of fulvotomentoside A on silica gel with chloroform - methanol - water 61:32:5. Detection by spraying with 10 % H2SO4 in ethanol followed by heating at 105 ºC for 5 min. Quantitative determination by densitometry at 518 nm. The procedure was validated regarding linearity range (1.20 - 7.20 µg/spot, r = 0.998), repeatability (0.51 %, n = 5), precision (0.21 %, n = 5 within plate and 0.87 % n= 5 plate-to-plate), and recovery (99.7 %, RSD = 2.45 %, n = 5). The results are given for three batches of real life samples.