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.

J. Planar Chromatogr. 13, 171.175 (2000). HPTLC of morphine, caffeine, and paracetamol on silica gel with ethyl acetate - methanol - ammonia 17:2:1. Visualization under UV 253 nm. Detection limits were 0.5 µg for morphine and 0.2 µg for caffeine and paracetamol.

J. Liq. Chromatogr. Relat. Technol. 35, 1213-1221 (2012). HPTLC of nicotine in cigarettes on silica gel with n-hexane - methylene chloride - methanol 4:16:3. Quantitative determination by absorbance measurement at 254 nm. Linearity was in the range of 0.1-1 mg/mL. Precision was estimated with an %RSD below 2.0. Limits of detection and quantification were 0.008 mg/mL and 0.02 mg/mL, respectively. The method provides acceptable intra-day and inter-day precision for nicotine. Recovery was between 97.5 and 98.4 %, respectively.

Anal. Proc. 21, 432-434 (1984). Application of the Mean List Length concept to identification of unknown drugs (MLL concept: determination for a given substance, for a given system or combination of systems, how many other substances from the total population would qualify for identification. The shorter the MLL the better is the system for systematic toxicological analysis. With MLL -1 the individual substance can be identified unequivocally against all other substances in the set.) 100 basic and neutral drugs. 8 systems.

Arzneim.-Forsch. 39, 556-559 (1989). TLC of quazepam and metabolites after acidic hydrolysis and extraction on silica with toluene. Detection after diazotation and coupling with Bratton-Marshall reagent forming a violet dye.

(Detection and identification of flunitrazepam (RohypnolR) in urine by TLC.) T+K 61 (3), 74-79, (1994). Sample preparation by acid hydrolysis followed by solid phase extraction (Extrelut); reduction of the nitro group by TiCl3. Chromatography on silica with chloroform - acetone - NH3 60:30:5, post chromatographic derivatization with Bratton-Marshall reagent; detection limit 100-150 ng/mL urine. Advantages over GC/MS: less interference by large concentrations of other drugs; low time requirement.

J. Planar Chromatogr. 10, 133-134 (1997). TLC of thiopentone (5-ethyl-5-(1-methylbutyl)-2-thiobarbituric acid) and butobarbitone, phenobarbitone, pentobarbitone, phenytoin, and quinalbarbitone on silica with hexane - acetone 4:1 with chamber saturation. Detection by spraying with an acidified potassium iodate - starch solution. Preparation of acidified 1% potassium iodate solution by dissolving 1 g potassium iodate in 100 mL distilled water and acidifying with hydrochloric acid; 1% aqueous starch solution; reagent solution: mixing of 20 mL acidified 1% potassium iodate solution and 5 mL starch solution immediately before use.