Scientia Pharmaceutica 55, 101-105 (1987). TLC on silica with benzene - ethyl acetate 9:1. Detection by spraying with anisaldehyde - sulfuric acid reagent.

J. Planar Chromatogr. 15, 466-469 (2002). TLC of tetraphenylporphyrin derivatives belonging to two homologous series A and B on silica gel with chloroform - carbon tetrachloride and on RP-18 with methanol ñ chloroform. After drying visual detection of the spots. Optimal separations were achieved by adsorption TLC with carbon tetrachloride - chloroform 1:1 and by partition TLC on RP-18 with methanol - chloroform 2:3.

J. Planar Chromatogr. 27, 477-479 (2014). HPTLC of N,N-dimethyltryptamine in seized street samples on silica gel with methanol – ammonia 200:3. Quantitative determination by absorbance measurement at 220 nm. The hRF value of N,N-dimethyltryptamine was 50. Linearity was in the range of 11.5-34.2 μg/zone. The intermediate precisios were below 5 % (n=3). The LOD and LOQ were 3.3 and 9.9 μg/zone, respectively. Mean recovery was 117.9 %.

J. Liq. Chromatogr. Relat. Technol. 33, 922-935 (2010). TLC and HPTLC of 22 different pyridinium aldoximes on silica gel with water - acetonitrile - acetic acid 8:1:1, water - acetone - acetic acid 8:1:1, and acetone - 50 mM aqueous sodium acetate 1:4 using unsaturated and saturated vapor phase as well as OPLC. Detection under UV 254 nm.

J. Liq. Chromatogr. & Relat. Technol. 30, 557-574 (2007). TLC of trigonelline (3-carboxy-1-methylpyridinium hydrochloride) and degradation products on silica gel with n-propanol - methanol - water 4:1:4 in a twin-trough chamber. Quantitative determination by absorbance measurement at 269 nm.

E-Journal of Chemistry 7(2), 341-348 (2010). HPTLC of nebivolol hydrochloride and hydrochlorothiazide on silica gel with ethyl acetate - methanol - 25 % ammonia 17:2:1 with chamber saturation. The hRf value of hydrochlorothiazide was 21 and of nebivolol 41. Densitometric evaluation at 285 nm. The method was linear in the range of 200-1000 ng/band for nebivolol and 500-2500 ng/band for hydrochlorothiazide. The recovery was 98.9-102.4 %. Comparison of the HPTLC method with a RP-HPLC method and a UV spectroscopic method gave comparable results. The HPTLC method is suitable for routine quality control.

62nd Indian Pharmaceutical Congress Abstract No. F-242 (2010). TLC of gatifloxacin and ornidazole on silica gel with n-butanol – ethanol – 8M ammonia 10:1:3. Quantitative determination by absorbance measurement at 299 nm. The hRf value of gatifloxacin was 27 and of ornidazole 83. The method was found to be linear between 20-100 ng/zone for gatifloxacin and 50-250 ng/zone for ornidazole (r2> 0.99). The limit of detection and quantitation were found to be 4.1 and 12.5 ng/zone, respectively for gatifloxacin and 10.3 and 31.2 ng/zone, respectively for ornidazole.

J. Liq. Chromatogr. Relat. Technol. 37, 1114-1132 (2014). HPTLC of rosuvastatin on silica gel with chloroform - n-hexane - methanol - glacial acetic acid 80:100:40:15:1. Quantitative determination by absorbance measurement at 295 nm. The hRf value for rosuvastatin was 9. Degradation products (DPs) were characterized by ESI-MS. For acidic hydrolysis, 4 major DPs with hRF values of 16, 27, 74 and 77 were obtained. For alkaline hydrolysis, one major DP of hRF 73 was detected. For thermal hydrolysis two major DPs with hRF 74 and 77 were detected. For exposure to hydrogen peroxide, 5 major DPs with hRF 15, 25, 30, 71 and 77 were obtained. For photolytic hydrolysis, 2 major DPs with hRF 70 and 78 were detected. Linearity was in the range of 500-20000 ng/zone. The intermediate/interday/intra-day precisions were below 2 % (n=3). The LOD and LOQ were 170 and 500 ng/zone. Average recovery was 99.9 %.