Indian Drugs 42 (12), 805-807 (2005). HPTLC of alprazolam and sertraline in tablet dosage form on silica gel with toluene - ethyl acetate - methanol - acetic acid 90:30:20:3 without saturation. Quantitative determination by absorbance measurement at 217 nm. Accuracy, precision, and linearity were established. The linearity range was 20-100 ng for alprazolam and 100-500 ng for sertraline. Recovery rates were between 99.8-100.5 % for both drugs.

Talanta 60 (5), 945-953 (2003). TLC of linezolid from its alkaline degradation product on silica gel with isobutanol - ammonia 9:1. Quantitative determination by densitometric measurement at 244 nm. The proposed method and two other methods (based on spectrophotometry) were successfully applied to the determination of the drug in bulk powder, in laboratory prepared mixtures with its degradation product and in commercial tablets.

J. Planar Chromatogr. 19, 42-47 (2006). TLC of 14C metabolites of denaverin (2,2-diphenyl-2-(2-ethylbutoxy)acetic acid-2-(dimethylamino)-ethyl ester) on silica gel with chloroform - cyclohexane - methanol - ammonia 100:70:30:3. Detection with autoradiographic films after exposure for one week. Quantitation after scraping the adsorbent from the plate followed by determination of radioactivity by LSC.

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.

Acta Chrom. 12, 159-169 (2002) Acta Chrom. 12, 159-169 (2002) TLC of carbohydrates on LK5DF silica gel plates containing 19 lanes and a pre-adsorbent sample-application zone, prewashed with dichloromethane – methanol 1:1, with ethyl acetate – glacial acetic acid – methanol – water 12:3:3:2. Detection by spraying with alpha-naphthol–sulfuric acid sugar-detection reagent followed by heating at 110 ºC for 5 min. Densitometry of glucose and raffinose at 515 nm. HPTLC of amino acids with four different TLC systems: on silica gel with preadsorbent zone, on RP-18 with concentrating zone, on cellulose F with n-butanol – acetic acid – water 3:1:1, and on ion-exchange sheets with citrate buffer of pH 3.3 (84 g citric acid monohydrate, 16 g NaOH, and 5.9 mL HCl 37% per L). Detection by spraying with ninhydrin reagent, followed by drying in air for 30 min and heating for 10 min at 110 ºC. Quantification by densitometry at 495 nm for histidine and 610 nm for tryptophan.

J. Chinese Trad. Patent Med. (Zhongchengyao) 27 (8), 896-899 (2005). TLC of Wumei Rendan pills on silica gel with ethyl acetate - formic acid - water 2:1:1. Detection by spraying with 10 % ethanolic H2SO4 solution followed by heating at 105 ºC. Identification of the fingerprint. Quantification of menthol by GC, and of ammonium glycyrrhiziate by HPLC.

Durand & H. Durand by pH-zone-refining countercurrent chromatography. J. Liq. Chromatogr. Relat. Technol. 28, 775-783 (2005). TLC of Picralima alkaloids (akuammigine, picraline, akuammicine, picranitidine, akuammine, akuammiline, akuammidine, akuammigine) on silica gel with benzene - ethyl acetate - methanol - isopropanol - 25 % ammonia 12:6:3:3:1; toluene - ethyl acetate - diethylamine, saturated with 25 % ammonia 7:2:1, and toluene - ethyl acetate - diethylamine 7:2:1. Detection under UV light or by spraying with Dragendorff reagent.

Indian J. Pharm. Sci. 68 (6),788-789 (2007). HPTLC of etorocoxib in dosage forms on silica gel with chloroform - methanol - toulene 2:1:2. The plate was scanned at 289 nm for quantitative evaluation. The hRf value of etorocoxib was 58. The method was linear in the range of 100 - 600 ng/spot.The method was validated for accuracy, precision and repeatability. It was found suitable for routine quality control of formulations.