J. Planar Chromatogr. 29, 394-396 (2016). HPTLC of 1-(8-bromobenzo[1,2-b;4,5-b′]difuran-4-yl)-2-aminopropane, popularly known as Bromo-DragonFLY on silica gel with methanol – ammonia 200:3. Quantitative determination by absorbance measurement at 281 nm. The hRF value for Bromo-DragonFLY was 50. Linearity was between 6 and 75 μg/zone. The intermediate precisions were below 4.3 % (n=3). The LOD and LOQ were 2.1 and 6.3 μg/zone, respectively. Average recovery was 94.5 %.

Detection and identification of phenethylamines (stimulants and hallucinogenes). Sci. Pharm. 55, 1-11 (1987). Method for the rapid identification of phenethylamine. Color reactions with 4 reagents: a) formaldehyde - sulfuric acid (Marquis), b) ammoniummetavanadate - sulfuric acid (Mandelins), c) ammoniummolybdate - sulfuric acid (Fröhde), d) nitric / sulfuric acid as preliminary group identification preceding TLC. TLC with 6 separation systems, 4 using silica, 2 RP-18 layers, with 6 solvent systems. Postchromatographic derivatization with 5 systems selected according to layer material and previous observations. Results of the identification procedure presented in the form of tables.

J. Chinese Herb Med. (Zhongcaoyao) 23, 125-126 (1992). TLC of six bufoginins on silica with chloroform – acetone – cyclohexane 3:3:4. Quantification by densitometry at 300 nm.

J. Planar Chromatogr. 8, 143-144 (1995). HPTLC of diazepam, nitrazepam, oxazepam, methaqualone, heroin, on silica with hexane - methanol - acetone 15:3:2, benzene - acetone - ethanol 8:1:1, and chloroform - acetone 8:2. Detection by inspection under UV 254 nm and spraying with Dragendorff's reagent. Quantification by comparison against standards.

J. Planar Chromatogr. 10, 348-352 (1997). Development of a simple, rapid and reliable TLC method for the identification and quantification of 11-nor-D9-tetrahydrocannabinol-9-carboxylic acid (THC-COOH) in urine. HPTLC on silica gel 60 WRF254s layers (0.1 mm layer thickness) with dichloromethane - hexane - methanol 7:2:1. Because the chromatograms were evaluated directly by HPTLC-UV and HPTLC-FTIR on-line coupling, it was not necessary to derivatize with fast blue salts or other health-endangering azo dyestuffs. The validated detection limits for THC-COOH (UV: 4 ng/mL, IR: 14 ng/mL) enabled qualitative and quantitative evaluation in the region of the 20 ng/mL cutoff.

Proc. Intern. Symp. on Planar Separations, Planar Chromatography 2001, pp. 321-326. TLC/AMD and OPLC (Optimum Performance Laminar Chromatography) of Opium extract and morphine , codeine, thebaine, papaverine, noscapine, ethylmorphine, pholcodine, heroin, buprenorphine, dextromethorphan, methadone as reference substances: TLC of Opium alkaloids on silica gel with toluene - acetone - ethanol - 28% NH3 45:45:7:1. OPLC on aluminium oxide with ethyl acetate as mobile phase and AMD with methanol, acetone, ethyl acetate, ethyl acetate/dichloromethane, dichloromethane. TLC is quick, simple, cheap, detection is easy and permits densitometry; OPLC is a fast method; AMD presents the best resolution, no diffusion of spots, elution without oxidation and is considered as a very interesting method for densitometry.

J. Sep. Sci. 30, 2053-2058 (2007). HPTLC of umbelliferone (1), psoralen (2), and eugenol (3) in the dried fruit pulp of Aegle marmelos and in the fruit of Trachyspermum ammi and Foeniculam vulgare on silica gel with toluene – methanol 19:1. Quantitative determination by absorbance measurement at 331 nm for (1), 304 nm for (2), and 280 nm for (3). The hRf values were 30, 58, and 70 for (1), (2), and (3), respectively. Linearity was between 1 and 5 ng/zone, 16 and 96 ng/zone, and 200 and 1000 ng/zone for (1), (2), and (3), respectively. The limits of detection and quantification were 0.8 and 1.2 ng/zone for (1), 8 and 16 ng/zone for (2), 60 and 150 ng/zone for (3), respectively. Recoveries were 98.9 %, 100.1 %, and 99.3 %, for (1), (2), and (3) respectively.

Indian Drugs 44(8), 636 (2007). HPTLC of charantin in chloroform extracts of herbal formulations on silica gel with benzene - methanol 4:1. Detection by spraying with 10 % alcoholic sulphuric acid and heating at 130 °C for 2 min. Quantitative determination by densitometry at 536 nm. The hRf of charantin was 32. Linearity was between 20 and 600 ng/mL. Recovery was 98.9 %