J. Planar Chromatogr. 8, 69-72 (1995). TLC and HPTLC of hepatotoxins in aqueous and algal samples on silica and RP-18 with 13 different mobile phase systems. Scanning densitometry at 196 nm, confirmation by multiwavelength scanning. The method described is a rapid and facile test, which can be performed in small laboratories, for screening water sources or blooms for cyanobacterial toxins in a hygienic setting.

J. Planar Chromatogr. 25, 571-574 (2012). HPTLC of theanine in tea extracts on silica gel with n-butanol - acetone - acetic acid - water 7:7:2:4. Detection by dipping into a ninhydrin reagent for 3 s, followed by heating at 105 °C for 5-15 min. Quantitative determination by analysis of green channels of photographs using the CP Atlas 2.0 software. The hRf of theanine was 35. Linearity was in the range of 1.4-14 ng/zone. The intermediate/inter-day/intra-day precision was below 0.7 % (n=3). Recovery (by standard addition) was between 95.7 and 102.5 %.

Helv. Chim. Acta 66, 1101-1109 (1983). TLC of peptidic conjugates carrying a single 2-carboxy-4, 6-dinitro-phenyl haptenic group and a carbohydrate moiety on silica with a) 1, 4-dioxane -water 5:1, b) propanol -water - ethyl acetate 7:2:1 and c) butanol - water - ethyl acetate 9:4:5. Detection with fluram and ninhydrin for peptides and amino acids and with sodium periodate/benzidine for the carbohydrate derivatives. Also electrophoresis.

J. Liquid Chromatogr. 6, 127-137 (1983). TLC of gamma -aminobutyric acid and glutamic acid on ionex SP-Ac (equilibrated with 0.05 % acetic acid) with ethyl acetate - water 8:92. Detection with 0.2 % ninhydrin in butanol- acetic acid 95:5 and heating at 70 °C.

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.