J. Planar Chromatogr. 2, 79-82 (1989). TLC of PTH amino acids on silica with three different solvent systems: petrol ether (60-80°) - acetic acid 25:3, hexane - butanol 29:1, hexane - butyl acetate 4:1. Visualization by exposure to iodine vapor. Quantification by absorbance at 245 nm and 269 nm after elution with ethyl acetate. The method is used for the identification of proteins from peanuts and rape seed.

J. Planar Chromatogr. 3, 85-87 (1990). TLC separation of 23 amino acids on silica and on NiCl3-impregnated silica with butanol - acetic acid - water 3:1:1, butanol - acetic acid - chloroform 3:1:1 and butanol - acetic acid - ethyl acetate 3:1:1 as eluent. Detection by spraying with freshly prepared ninhydrin solution. Slight improvement of separation by impregnation.

J. Planar Chromatogr. 5, 143-146 (1992). TLC of a new class of amino acid derivatives (prepared by protection of the amino group with diethyl ethoxymethylenemalonate and esterification with 2-bromo-4'-phenylazoacetophenone) on silica with TLC on silica with toluene - ethyl acetate in different proportions for one-dimensional TLC and toluene - ethyl acetate in different proportions for one-dimensional TLC and toluene - ethyl acetate 3:2, first direction, and chloroform - methanol 200:1, second direction, for two-dimensional TLC. Detection under UV 254 and 366 nm.

J. Planar Chromatogr. 8, 117-121 (1995). HPTLC of monosodium glutamate on silica (no indication of the mobile phase), threefold ascending development to a height of 60 mm, in an unsaturated tank. Detection by spraying with ninhydrin solution. Quantification by densitometry at 520 nm (absorbance). Detection limit 3 mg MSG/mL. Compared with the enzymatic method, TLC is quick, precise, cheap, and suitable both for industrial quality control as well as for occasional analyses.

Anal. Chim. Acta 316, 105-110 (1995). Study of the interaction of 23 antisense nucleosides with amino acids by charge-transfer reversed-phase TLC, and evaluation of the retention matrix by principal component analysis. Discussion of the effect of amino acids on the retention of nucleosides, and stacking interactions between the ring structures of nucleosides and Trp and Phe.

J. Planar Chromatogr. 11, 300-304 (1998). Determination of the TLC retention of fifteen amino acids on silica gel layers developed with different mobile phases. Visualization with ninhydrin solution. Correlation analysis was conducted and fifteen parameters are discussed - including topological indexes and physicochemical properties - three of which were selected with both topological and physicochemical significance for construction of multi-parameter regression equations for prediction of the Rf values of the amino acids. Experimental results were in good agreement with calculated values, which confirms the accuracy of the predictions. - TLC of 15 amino acids on silica gel with ethanol - water 4:1, 8:1, 2:1 and propanol - acetic acid - water 3:1:1, 6:2:1, 1:1:1. Densitometry at 460 nm after visualization and heating for 1.5 - 2 min at 105°C.

J. Chromatogr. A 888 (1/2), 335-339 (2000). Investigation of the TLC behavior of the natural, sulfur-containing amino acids (Cys, Hcys, Met) and their phosphonic analogues (Cysp, Hcysp, Metp) by employing 8 TLC systems. Determination of the detection limits of the compounds using iodine and molybdate, ninhydrin and iodine-azide reagent. Comparison of the Rf values of the two classes of amino acids in acidic, neutral and mild basic solvent systems.

J. Planar Chromatogr. 17, 113-122 (2004). HPTLC of serine, threonine, phenylalanine, tryptophan, lysine, ornithine, arginine, valine, and leucine on silica gel with A) 2-propanol - ethyl acetate - 25 % ammonia - water 40:40:3:50; B) 2-propanol - acetone - water - 25 % ammonia 25:25:7:6; C) 2-propanol - 25 % ammonia 7:3; D) chloroform - 96 % ethanol - acetic acid - water (52.5-54.0):(26.0-27.5):(8.9-9.6):(3.5-4.2); E) 1-propanol - 25 % ammonia 11:9; F) 1-propanol - 25 % ammonia - water (3.3-4.1):(0.9-1.5):(7.5-9.0); G) t-amyl alcohol - 2-butanone - water 22:6:5, upper layer, in a presaturated twin-trough chamber. Detection by dipping into a ninhydrin solution. Quantitative determination by reflectance measurement at 500 nm.