J. Planar Chromatogr. 9, 286-288 (1996). HPTLC of 3,4-methylenedioxyamphetamines of the ecstasy group (MDA - 3,4-methylenedioxyamphetamine, MDMA - N-methyl-3,4-methylenedioxyamphetamine, MDE - N-ethyl-3,4-methylenedioxyamphetamine) on silica with ethyl acetate - acetone - methanol - 25% NH3 10:10:4:1. After careful removal of the mobile phase, NH3 in particular, derivatization with OBPB solution (26.3 mg in 100 ml acetone or methanol) by dipping the chromatogram three times, 2 s each. The plate was heated at 100°C for 5 min for stabilization. The reagent solution is stable for several months if stored in the refrigerator protected from light. Densitometry before derivatization at 283 nm and after derivatization at 355 nm; recording of spectra.

J. Planar Chromatogr. 13, 146-148 (2000). TLC of the bitterant denatonium saccharide on silica gel with ethanol - methanol - butanol - hydrochloric acid 18:48:18:0.05 in a presaturated chamber. Detection after drying by exposure to chlorine gas for ca 5 min. After removal of all excess chlorine, the plate was uniformly sprayed with o-tolidine reagent and then with 1% phosphomolybdic acid. The detection limit for denatonium saccharide is 0.2 µg per spot.

J. Liq. Chromatogr. & Relat. Technol. 29, 2587-2592 (2006). TLC of solanesol on silica gel with petroleum ether - ethyl acetate 4:1. Detection by spraying with sulfuric acid - anisaldehyde - glacial acetic acid 5:5:90, followed by at 110 °C.

J. Planar Chromatogr. 22, 29-33 (2009). HPTLC of theophylline (extracted at pH 8.5 with chloroform - isopropanol 4:1 from post-mortem blood after acid hydrolysis) on silica gel in a twin trough chamber with chloroform - methanol 9:1. Quantitative determination by absorbance measurement at 277 nm. Polynomial regression in the range of 0.5-20 µg/mL. The limit of detection was 0.5 µg/mL (S/N = 3). Intra-day and inter-day repeatability was between 0.5-0.8 % and 0.5-1.3 %, respectively, for three different concentrations in the range of 0.5-10 µg/mL. Recovery was 89.1-93.4 % at a concentration of 10 µg/mL and pH 8.3-8.6. An average analytical recovery of 89.9 % was achieved at pH 8.5 with a relative standard deviation of 2.2 %. Theophylline was stable in methanolic solution and during chromatography.

Budapest Chromatography Symposium, June 13, 1985. EGYT 1855: TLC on silica with chloroform in the first dimension, ethyl acetate - propanol -10 % acetic acid 2:2:1 in the second dimension. Staining with Dragendorff reagent; densitometry by absorbance at 450 nm. GYKI 51 189: TLC on silica with benzene in the first dimension, benzene - ethyl acetate 20:8 in the second dimension; detection by UV 254 nm, densitometry by absorbance at 300 nm.

Anal. Chim. Acta 225, 137-146 (1989). One- and two-dimensional TLC of residues of veterinary tranquillizers and the ß-blocker carazolol on silica with 1) acetone – dichloromethane – 25% NH3 40:60:1 and 2) acetone – 25% NH3 100:0.1 and 3) acetone. Detection by spraying with 1) Dragendorff’s reagent, 2) vanillin-phosphoric acid and 3) sulfuric acid – ethanol – ether 2:10:2. Limits of identification range, 1–2.5 µg/kg.

J. Planar Chromatogr. 7, 95-97 (1994). Identification of herbs and herbal products by TLC followed by photo documentation acc. to H. Wagner, S. Bladt, E.M. Zgainski, Plant Drug Analysis, Springer Publishers, Berlin, Germany (1984) and "finger printing" comparison. Reported: TLC of plant extracts on silica. Tonka beans with methanol; main component of interest was coumarin. Bloodroot with propanol - formic acid - water 90:1:9; main component of interest was berberine hydrochloride. Calamus with toluene - ethyl acetate 93:7, visualization by spraying with vanillin-sulfuric acid reagent; main component of interest was asarone. Yohimbe bark with toluene - ethyl acetate - diethyl amine 7:2:1, visualization under UV 356 nm; main component of interest was yohimbine hydrochloride. Mandrake with chloroform - methanol 9:1, visualization by spraying with sulfuric acid; main component of interest was podophyllum resin. Buckthorn bark with ethyl acetate - methanol - water 100:27:20, visualization under UV 356 nm; main components of interest were frangulins A and B.

Proc. 9th Internat. Symp. Instr. Chromatogr., Interlaken, April 9.-11., 161-162 (1997). Identification of LSD, MBDB and atropine by HPTLC-FTIR; it is possible to distinguish MBDB unequivocally from its closely related 3,4-methylenedioxyamphetamine derivatives MDA, MDMA, and MDE and from BDB on the basis of RF values and DRIFT spectra. Identification of N-ethyl-3,4-methylenedioxyamphetamine and its major metabolites in urine. Detection of cocaine and benzoylecgonine in urine by coupling of AMD and FTIR spectroscopy, using a two-dimensional HPTLC development with FTIR; identification limits for cocaine and benzoylecgonine are 400 ng/mL and 180 ng/mL, respectively. Determination of 11-nor-D9 THC-9-carboxylic acid on acid-resistant silica with detection limits of 4 ng/mL in UV and 14 ng/mL in IR allow both qualitative and quantitative analysis.