J. Chromatogr. 504, 456-463 (1990). TLC of title compounds on cellulose or silica with one of the following solvents; 1) 2-methylpropan-2-ol - butanone - propanone - methanol - water - NH3 40:20:20:1:14:5, 2) butanol - propanone - acetic acid - water 35:35:10:20. Detection: spraying with 2,4-dinitrophenylpyridium chloride in methanol 200 mg/L for cellulose and 100 mg/L for silica - placing the plate in sealed glass tank with alkaline atmosphere for 15 min, keeping plate in the dark for 24 h before recording the fluorescence.

J. Liquid Chromatogr. 19, 687-698 (1996). TLC of tryptophan, 5-hydroxytryptophan, 3-indoleacetic acid and serotonin on cellulose with chloroform - methanol - NH3 12:7:1. Quantification by in situ scanning with a fibre optic-based fluorescence instrument at 280/>347 nm. RSD, 1.70-6.52 %.

J. Chromatogr. Sci. 46 (6), 565-573 (2008). Investigation of selected amino acid standards on cellulose layers using organic-aqueous eluent systems modified with neutral and chaotropic salts: chlorides, iodides, nitrates, thiocyanates, perchlorates, and hexafluorophosphates at low concentrations from 10 to 80 mM in the mobile phase. The effect of salts used as mobile phase modifiers was evaluated by comparison of densitograms, peak symmetry coefficients, and theoretical plate numbers. The efficiency of the investigated chromatographic systems depends primarily on the kind of salt and organic solvent in the mobile phase. The best efficiency was obtained by adding ammonium thiocyanate to the mobile phase which contained acetonitrile as an organic modifier.

J. Liq. Chromatogr. Relat. Technol. 33, 1028-1037 (2010). HPTLC of amino acids (e. g. alanine, arginine, glycine, leucine/isoleucine, lysine, serine, and valine) on silica gel or cellulose pre-washed with dichloromethane - methanol 1:1 using either 2-butanol - pyridine - glacial acetic acid - water 39:34:10:26 or 2-butanol - pyridine - 25 % ammonia - water 39:34:10:26 in a saturated twin-trough chamber. Detection by treatment with ninhydrin reagent (0.3 g ninhydrin in 100 mL of n-butanol with 3 mL of glacial acetic acid) and heating at 110 °C for 10 min. Quantitative determination by densitometric absorbance measurement at 610 nm.

J. Liq. Chromatogr. Relat. Technol. 37, 2197-2205 (2014). HPTLC of L-lysine (1), L-threonine (2), L-valine (3), L-isoleucine (4), and L-tryptophan (5) on silica gel with 1-butanol - glacial acetic acid - water 2:1:1. Detection by spraying with ninhydrin reagent, followed by heating at 85 °C for 5 min. Quantitative determination by absorbance measurement at 254 nm. The hRF values for (1) to (5) were 21, 45, 57, 64 and 70, respectively. The LOD and LOQ were 20 and 36 ng/zone for (1), 40 and 51 ng/zone for (2), 37 and 40 ng/zone for (3), 10 and 12 ng/zone for (4) and 28 and 30 ng/zone for (5), respectively.

Proc. Intern. Symposium on TLC with special Emphasis on OPLC, Szeged, 19-20 (1984). OPLC (OPTLC) of L-arginine, monomethylol-arginine, dimethylol-arginine, trimethylol-arginine on ion exchange silica sheets with a solution of 50 g citric acid, 30 g sodium hydroxide, 7 ml conc. HCl and 450 ml water. Detection with a mixture of 0.2 g ninhydrin, 80 ml methanol, 20 ml acetic acid and 0.05 g cupric sulfate.

V. Danube Symposium on Chromatography, Yalta, November 11 -16, 1985. Retention behavior of tri-, di-, monomethyl-arginine, arginine, formyllysine, lysine on silica of different provenience with water containing 0.05, 0.1, 0.25 and 0.5 M NaCl.

Quantification after elution by fluorescence spectrophotometry at 360 nm excitation and 510 nm emission.