J. Chromatogr. Sci. 33, 485-492 (1995). Use of TLC for drug screening. Assay of the underivatized amines with standards containing amphetamine as reference compounds to standardize Rf values. Comparison of the responses to different visualization reagents. Description of the analytical profiles for the title drugs by GC-MS.

Indian Drugs 34(1), 36-42, (1997). TLC on silica with hexane - ethyl acetate 2:1. Densitometry at 254 nm and in the visible after spraying with sulfuric acid - methanol 1:9, followed by heating at 80°C.

Anal. Chem. 69, 145R-163R (1997). A review with 14 references on TLC applications.

J. Chinese Trad. Patent Med. (Zhongchengyao) 22 (9), 618-621 (2000). TLC on silica gel with 1) cyclohexane - chloroform - ethyl acetate - acetic acid 40:10:16:1, 2) hexane - ethyl acetate 17:3, 3) petroleum ether (30-60°C) - ethyl formate - formic acid 15:5:1. Detection 1) by spraying with 10% sulfuric acid in ethanol and heating at 100°C for 5 min, 2) by spraying with 5% vanillin in sulfuric acid, 3) under UV 254 nm. Identification by finger print. Quantitation of paeoniflorin by HPLC.

JAOAC Int. 84, 1219-1231 (2001). Compilation of the role of planar chromatography (PC) in medicinal and aromatic plant (MAP) research and development, and demonstration of the importance of the technique, after extraction, in the analysis of MAP (identification and quantitative determination of the separated compound/s), in the purification and isolation process, and in different types of screening procedure. Special attention is paid to analytical, micropreparative and preparative forced-flow techniques, for example OPLC and rotation planar chromatography (RPC). Purification and isolation procedures are shown in flowcharts. Some applications, relating to different classes of substance, are presented to demonstrate the versatility of various planar chromatographic techniques.

J. Liq. Chrom. Rel. Tech. 38, 271-282 (2015). HPTLC of (1) terazosin, (2) doxazosin, (3) prazosin, and (4) alfuzosin in plasma on silica gel with acetonitrile - phosphate buffer 3:7 at pH 3. Quantitative determination by absorbance measurement at 332 nm. The hRF values of (1) to (4) were 52, 47, 53 and 41, respectively. Linearities were between 10 and 100 ng/zone for (1) and (2), between 15 and 75 ng/zone for (3) and between 5 and 100 ng/zone for (4). The LOD and LOQ were 4 and 9 ng/zone for (1), 5 and 10 ng/zone for (2), 7 and 14 ng/zone for (3) and 4 and 5 ng/zone for (4), respectively. The intermediate intra-day and inter-day precisions were below 2.6 % (n=6). Mean recoveries were found in the range of 94.2-99.9 %.

J. Planar Chromatogr. 20, 335-339 (2007). TLC of etoricoxib (rofecoxib as internal standard) on silica gel in a filter-paper-lined twin-trough chamber previously saturated with mobile phase vapor for 30 min with toluene - 1,4-dioxane - methanol 17:2:1. Densitometric analysis of etoricoxib was performed in absorbance mode at 235 nm. The limits of detection and quantitation were 30 and 100 ng/zone, respectively.

Determination by using autoradio - layer chromatographic recorder.