Proc. Intern. Symp. on Planar Separations, Planar Chromatography 2001, pp. 223-233. OPLC of 47 drugs (benzodiazepines and 'non-benzodiazepines': new type psychotics) on HPTLC silica gel with ethyl acetate - chloroform 3:7 as best mobile phase for benzodiazepines. Densitometric evaluation by densitometry at the absorption maxima of the respective compounds.

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. Planar Chromatogr. 29, 388-390 (2016). HPTLC of dimethoate from post mortem viscera on silica gel with hexane - acetone 4:1. Detection by spraying with freshly prepared sodium nitroprusside solution (1 % sodium nitroprusside in 2 N sodium hydroxide solution prepared with especially sulfide-free distilled water). The hRF value for dimethoate was 88.