J. Planar Chromatogr. 4, 483-484 (1991). TLC of 5-ASA and potential impurities (4-aminophenol, 2,4-diaminophenol, 2,5-dihydroxybenoic acid, salicylic acid, 3-aminosalicylic acid) on cellulose with methanol - dioxane - THF - NH3 55:25:15:5. Detection by spraying with ferricyanide - ferric chloride reagent.

J. Planar Chromatogr. 6, 216-219 (1993). HPTLC of the enantiomers of metoprolol, propranolol, and alprenolol on DIOL silica with dichloromethane - N-benzoxycarbonyl-glycyl-L-proline (5 mmol). Densitometry at 280 or 300 nm, with subtraction of the absorbance at 350 nm. A simple and fast method for verifying the presence of an enantiomer or racemate in a pharmaceutical formulation.,

Arzneim.-Forsch./Drug Res. 45 (I), 190-194, (1995). TLC of 12 chloroethyl nitrosourea analogues of cholesterol on silica with dichloromethane, dichloromethane - hexane 7:3, dichloromethane - methanol 49:1. Detection under UV.

J. Planar Chromatogr. 9, 116-119 (1996). HPTLC of ketoprofen, molsidomine, fusidic acid, pitofenone, and fenpiverinium on silica with chloroform - ethyl acetate - methanol 5:1:4, chloroform - cyclohexane - acetic acid - methanol 40:6:4:1, chloroform - acetone 8:2 and tetrahydrofuran - methanol - acetic acid 5:3:2. Detection under UV 254 nm. Quantification by densitometry at 233, 290 and 316 nm (absorbance). Recoveries 98.5 to 102.9%; RSD 0.7 to 1.9%. Simple, fast and reliable TLC procedure.

J. Planar Chromatogr. 9, 296-299 (1996). HPTLC of lansoprazole (4-ethoxytrifluoro-(3-methyl)-2-pyridylmethyl-sulfinyl-benz-imidazole) on silica with the dried organic layer of the mixture of ethyl acetate - methanol - 13.5 M NH3 10:3:4. Quantification by densitometry (absorbance) at 288 nm. Limit of quantification and limit of detection were found to be 40 and 10 ng, respectively. RSD of within-day precision and day-to-day repeatability were 0.55 and 0.42%, respectively. New specific, and sensitive chromatographic procedure.

J. Planar Chromatogr. 10, 178-181 (1997). TLC of clotrimazole (1-((2-chlorophenyl)diphenylmethyl)-1H-imidazole) on silica gel with diisopropyl ether - methanol - acetic acid 36:4:1. Quantification by densitometry at 215 nm. Repeatability of measurement (peak area) was 0.89%; repeatability of sample application (peak area) was 2.89%.

Indian Drugs 34 (6) 339-345 (1997). HPTLC on silica gel with toluene - acetone - isopropanol - NH3 60:30:20:3. Diloxanide furoate was used as internal standard. Visualization by spraying with 0.01% ninhydrin. Quantitation by densitometry at 520 nm.

J. Planar Chromatogr. 12, 96-108 (1999). Description of a method for off-line coupling of TLC and electron-impact ionization mass spectrometry (EIMS) which is well suited for routine forensic and toxicological investigations of a large number of samples incl. discussion of advantages and drawbacks of this approach. Several TLC systems for 493 compounds of forensic and toxicological interest are described and eight-peak mass spectra from full EI mass spectra are listed. TLC on silica gel with 1) methanol - 25% NH3 200:3, 2) cyclohexane - toluene - diethylamine 15:3:2, 3) chloroform - methanol 9:1, 4) chloroform - acetone 8:2, 5) ethyl acetate - methanol - 25% NH3 17:2:1, and 6) ethyl acetate. Reagents used for color reactions were: Marquis, modified Dragendorff, Ludy Tenger, potassium iodoplatinate, palladium chloride, ferric chloride-sulfuric acid, mercury nitrate-mercury sulfate, diphenylcarbazone, fast blue B, Bratton-Marshall (Clarke's Isolation and Identification of Drugs, 2nd edn, The Pharmaceutical Press, London, UK, 1986). TLC plates for biological samples were pretreated with a solution of methanol and 1.5 aqueous ammonia and reactivated for 2 h at 150°C in a clean oven and subsequently cooled in a clean closed system.