J. Planar Chromatogr. 10, 59-60 (1997). OPLC of biogenic amines (i.e. histamine, spermine, spermidine, putrescine, cadaverine, tyramine) on silica with dichloromethane - ethyl acetate 93:7. Quantification by densitometry at 313 nm.

J. Planar Chromatogr. 14, 360-363 (2001). HPTLC of 7 amines (p-chloroaniline, o-toluidine, o-anisidine, 2-naphthylamine, 4-chloro-o-toluidine, 2-diaminotoluene, 2-aminio-4-nitrotoluene) on silica gel plates with dichloromethane (developing distance 4.5 cm), drying and development with toluene - tetrahydrofuran 10:1 to a distance of 8.5 cm. Visualization under UV 254 nm. New quantitative very simple, accurate, low-cost, rapid and highly selective method.

Anal. Bioanal. Chem. 387, 1083-1093 (2007). A new HPTLC method for trace analysis (low µg/kg range) of the five heterocyclic aromatic amines PhIP (2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine), MeIQx (2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline), 4,8-DiMeIQx (2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline), norharmane (9H-pyrido[3,4-b]indole) and harmane (1-methyl-9H-pyrido[3,4-b]indole) in meat samples has been established. HPTLC on LiChrospher silica gel WRF with methanol – chloroform 1:9. Using the ADC2, the plate activity was adjusted to 34 % relative air humidity with MgCl2 x 6H2O for 15 min and, at the same time, chamber saturation with 35 mL aqueous ammonia 28 % – ultrapure water 1:4 was performed for 20 min, followed by alkaline plate preconditioning for 15 min. The development was performed in a fresh chamber. Quantitative determination by absorbance measurement at UV 262 nm and 316 nm, and fluorescence measurement at UV 366/>400 nm. The UV wavelength 316 nm was later substituted by 313/>340 nm for a more selective and sensitive determination of PhIP in the meat matrix. Mass spectrometric analysis was performed in ESI+ mode for confirmation of positive findings. The method was validated according to ICH guidelines. Repeatability was better than 3.3 % (n=14), the intermediate precision (n=6, peak area) was 0.4 % (PhIP), 0.6 % (MeIQx), 0.7 % (4,8-DiMeIQx), 0.9 % (norharmane) and 1.1 % (harmane). Reproducibility of the migration distance was better than 1.3 % (n=6). LODs were 4 ng/band for PhIP, 5 ng/band for MeIQx, 4 ng/band for 4,8-DiMeIQx, and 0.4 ng/band each for norharmane and harmane. LOQs were 6 ng/band for PhIP, 14 ng/band for MeIQx, 11 ng/band for 4,8-DiMeIQx, and 0.8 ng/band each for norharmane and harmane. Selectivity in the meat matrix was proven. Confirmation of the substances found in meat was performed by MS. In the working range RSDs of the calibration functions were between 1.9 and 3.6 %.

Indian J. Pharma Educ. Res. 42(1), 32-35 (2008). HPTLC of metoprolol succinate on silica gel with toluene - methanol - triethylamine 30:50:3. Quantitative determination by absorbance measurement at 274 nm. The hRf value was 40. The method was linear in the range of 5-10 ng/spot. The limit of detection and quantification was 430 ng/spot and 1310 ng/spot respectively. The method was suitable for routine quality control.

J. Planar Chromatogr. 24, 105-107 (2011). TLC of twelve bisquaternary acetylcholinesterase reactivator HI-6-salts (sulfate, chloride, acetate, bromide, phosphate, mesylate, tartrate, iodide, malonate, salicylate, maleinate, and tosylate) on cellulose with acetone - acetic acid - water - toluene 5:2:2:1, butanol - acetic acid - water - toluene 1:1:1:1, isopropanol - acetic acid - water - toluene 5:2:2:1, and isopropanol - formic acid - water - toluene 6:2:2:1 in a twin-trough chamber. Detection under UV light at 254 nm and by spraying with Dragendorff’s reagent.

Proc. Intern. Symposiumon TLC with special Emphasis on OPLC, Szeged, 13 (1984). TLC of 2,3-dimethylaniline, 3,4-dimethylaniline, 3,5-dinethylaniline, 2,5-dimethylaniline, 2,6-dimethylaniline, 2,4,6-dimethylaniline on silica with dichloromethane. Correlation between chemical structure and retention behaviour on silica.

Biomed. Chromatogr. 3, 46-47 (1989). TLC on silica with benzene - dimethyl formamide - acetic acid 30:10:7. Study of different metal salts as impregnating reagents. Detection by spraying with Dragendorff’s reagent.

Analyst 117, 1559-1565 (1992). Characterization of amines by TLC on silica with different solvent systems and the diazonium reagent Fast Black K salt and with subsequent novel procedures: acid treatment or treatment with N-(1-naphthyl)-ethylenediamine in acid solution. Demonstration of the differentiation of primary, secondary and tertiary aliphatic and aromatic amines, with special attention to drug substances. Detection limit, 10 ng of methamphetamine and 40 ng of methyl phenidate. Elucidation of the structures of the colored reaction products by TLC and NMR.