Asian J. Chem. 19(5), 3627-3632 (2007). TLC of simvastatin and ezetimibe on silica gel with ethyl acetate - chloroform 4:1. Quantitative determination by absorbance measurement at 220 nm. The hRf value of simvastatin was 76 and of ezetimibe 89. Linearity was between 600 and 1400 µg/mL for simvastatin and ezetimibe. The recovery (by standard addition method) was in the range of 99.7 and 99.6 % for both drugs. The proposed method is precise, accurate and can be used for routine analysis of simvastatin and ezetimibe in tablets.

J. Planar Chromatogr. 22, 35-42 (2009). HPTLC of phospholipids (lyso-phosphatidylcholine, sphingomyelin, phosphatidylcholin, lyso-phosphatidylethanolamine, phosphatidylinositol, phosphatidylethanolamine, phosphatidylserine, phosphatidic acid, and triacylglycerol) on silica gel with chloroform - ethanol - water - triethylamine 5:5:1:5. Detection by spraying with a solution of primulin (Direct Yellow 59). Evaluation under UV 366 nm. Detection by MALDI-TOF MS directly on the plates.

Anal. Chim. Acta, 572 (2), 237-242 (2006). Presentation of a stability-indicating method for simultaneous determination of the steroidal hormones levonorgestrel and ethinyloestradiol both in bulk drug and in low-dosage oral contraceptives by HPTLC on silica gel with hexane - chloroform - methanol 4:12:1. The hRf value of levonorgestrel was 65 and of ethinyloestradiol 43. The compounds were well separated from their degradation products. Quantitative determination by absorbance measurement at 225 nm. Linearity of levonorgestrel and ethinyloestradiol was 200–800 and 40–160 ng/spot, respectively.

Anal. Chim. Acta, 576 (2), 253-260 (2006). Description of a simple, sensitive, selective, precise and stability indicating method for determination of gatifloxacin both as a bulk drug and from polymeric nanoparticles by TLC on silica gel with n-propanol - methanol - 25 % ammonia 50:10:9. The hRf value of gatifloxacin was 60. Separation from degradation products (produced under acidic and basic conditions and upon wet and dry heat treatment) was good. Quantitative determination by absorbance measurement at 292 nm. Linearity was 400 - 1200 ng/spot, with a correlation coefficient of 0.9953. The limit of detection and quantitation was 3 and 8 ng/spot, respectively.

J. Chinese Trad. Patent Med. 30 (10), 1478-1482 (2008). TLC of Fangji Guanjie pill extracts on silica gel with 1) petroleum ether (60-90 ºC) - ethyl acetate 10:1; 2) ethyl acetate - formic acid - glacial acetic acid - water 15:1:1:2; 3) petroleum ether (60-90 ºC) - ethyl acetate 17:3; 4) chloroform - methanol - water 40:10:1; 5) diethyl ether - chloroform - methanol 4:2:1. Detection 1) under UV 254 nm; 2) by spraying with 10 % sulfuric acid in ethanol; 3) by spraying with dinitrophenylhydrazine in ethanol and heating at 105 ºC; 4) by spraying with 5 % potassium iodobismuthate solution. Identification by comparison with the standards fangchinoline and tetrandrine.

Chinese J. Pharm. Anal. 28 (3), 470-471 (2008). TLC of glucocorticoid in TCM formulations extracted with chloroform – methanol 9:1 on silica gel with dichloromethane – diethyl ether – methanol – water 385:60:15:2. Detection by spraying with a solution of tetrazolium blue chloride. Successful separation and identification of five glucocorticoids.

60th Indian Pharmaceutical Congress PA-219 (2008). HPTLC of rosuvastatin calcium on silica gel with toluene - ethyl acetate - formic acid 9:7:1. Quantitative determination by absorbance measurement at 254 nm. The hRf value was 32. The method was linear in the range of 100-100 ng/spot, recovery was 99.7 %.

Abstract No. 9162, IHCB (2009). HPTLC of glycyrrhizin in methanolic (70 %) extracts of Glycyrrhiza glabra on silica gel with chloroform - methanol - water 130:72:15. Quantitative determination by absorbance measurement at 254 nm and at 420 nm after spraying with anisaldehyde reagent. The method was linear in the range of 0.8-3.8 µg/spot. The limit of detection and quantification was 0.16 and 0.52 µg/spot, respectively. Glycyrrhizin was used as bioactive marker for quality control.