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. 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.

Abstract G-29, IPC (2005). HPTLC of valdecoxib in tablets and human plasma on silica gel with methanol - water - chloroform 6:3:1. Celecoxib was used as internal standard. Quantitative determination by absorbance measurement at 254 nm. The compound was extracted from plasma with ethyl acetate showing an extraction yield of 85 %. Linearity was obtained in the range of 25-200 ng/mL, recovery rate was 99.8 % from tablets and 97.2 % from plasma.

J. Planar Chromatogr. 18, 388-390 (2005). TLC of haloperidol and metabolites on RP-18 previously equilibrated for 30 min with methanol containing 0.001 % triethylamine at 27 +/- 1 °C (room temperature). Detection by treatment with iodine vapor. Quantitative determination at 230 nm.

Indian J. Pharm Sciences 67 (6), 762-764 (2005). HPTLC of fenofibrate in methanolic capsule extracts on silica gel with toluene - chloroform 7:3 with chamber saturation for 10 min. Quantitative determination by absorbance measurement at 296 nm. Linearity range was 1.2-3.8 g with recovery of 101.43 %. The proposed validated method was stability indicating and useful for routine analysis.

Indian Drugs 42 (7), 465-468 (2005). HPTLC of tizanidine and diclofenac in tablet formulations on silica gel with chloroform - methanol 4:1. Quantitative determination by absorbance measurement at 230 nm. Cetrizine was used as an internal standard. The solvent system was found to give compact spots for diclofenac sodium (Rf value 0.86), tizanidine (0.26) and cetrizine (0.52). The method was validated for linearity, accuracy and precision. Linearity for tizanidine was 0.6-1.4 µg/mL, and for diclofenac sodium 7.5-17.5 µg/mL . The mean recoveries obtained for tizanidine and diclofenac sodium were 98.73 % and 99.70 %, respectively. The proposed method was accurate, precise, selective and rapid for simultaneous estimation of tizanidine and diclofenac sodium in tablets.

J. Sep. Sci. 28, 1566-1576 (2005). HPTLC of itopride (subjected to acid and alkaline hydrolysis, oxidation, dry and wet heat treatment, UV and photo-degradation) on silica gel with toluene – methanol – chloroform 5:3:6 and 1 drop a of ammonia. Quantitative determination by absorbance measurement at 270 nm. The drug is well separated from its degradation products upon applying the two methods.

J. AOAC Int. 89, 995-998 (2006). HPTLC of phenobarbital on silica gel, prewashed with methanol and then acetone, using dichloromethane - ethyl acetate - formic acid 95:5:1 in a horizontal chamber. Quantitation by densitometry in the absorbance/reflectance mode at 210 nm. The validity of the HPTLC-densitometric method was established through a study of linearity, sensitivity, accuracy, and reproducibility.