J. Chromatogr. A 910 (1), 137-145 (2001). Determination of the relative strength of interaction between anionic (SDS) and nonionic surfactant (octaethoxyated oleyl alcohol, GEN) and homologous series of peptides by reversed-phase TLC on alumina layers impregnated with paraffin oil. Correlation of the relative strength of interaction with the physicochemical parameters of peptides, showing the dependence of the relative strength of interaction and the number of amino acid units in the peptides, side chain bulk and electronic properties and hydrophobicity of the amino acids, and the dependence of the impact of individual parameters on the character of surfactant. Discussion of modification of the retention order of peptides by adding different surfactants and surfactant mixture to the mobile phase.

J. Chromatogr. 243, 339-346 (1982). Ammonium tungstophosphate was used in the thin-layer chromatography of 96 peptides, using ammonium nitrate and nitric acid solutions as eluents. The peptides were detected by spraying with a solution of 1 % ninhydrin in pyridine - acetic acid 5:1 and heating at 100 °C for 5 minutes.

The Weizmann Institute of Science, Rehovot, Israel. Reversed phase TLC of dansyl amino acids on silica pre-treated with a copper-II-complex of N, N-di-n-propyl-L-alanine, with buffer A (0.3 M sodium acetate in 40 % acetonitrile and 60 % water adjusted to pH 7 by acetic acid). Detection by UV 360 nm.

J. Liquid Chrom. 10, 3647-3652 (1987). TLC of 15 amino acids on silica and on silica impregnated with 0.1M solutions of hydroxides of Mg, Ca, Sr and Ba with n-butanol - formic acid - ethanol 3:1:1. Detection with 0.2 % ninhydrin in acetone and heating at 70 °C for 10 min.

J. Planar Chromatogr. 7, 54-57 (1994). TLC of L-lysine, L-thionine, L-homoserine, vitamin B12, cobalamine on silica with 3 mobile phases (1-propanol - 25% NH3 - 55:45, 2-propanol - acetone - water - 25% NH3 25:25:7:6, 2-propanol - ethyl acetate - 25% NH3 - water 40:40:3:50 and on alumina with 2-methylpropan-1-ol - 2-propanol - water 3:2:2. Detection of amino acids with ninhydrin. Quantification by densitometry (absorbance at 500 nm for ninhydrin - amino acid complexes and 548 nm for cobalamines). Comparison to videodensitometry with a system developed by the authors.

J. Planar Chromatogr. 15, 371-376 (2002). TLC of 24 amino acids (Gly, Hyd, Ala, n-But, Ser, Pro, Val, Thr, Cyst, Leu, Ile, n-Leu, Met, Tyr, b-Phe, Trp, DOPA, Cys, Orn, Lys, His, Arg, Asp, Glu) on untreated and on triaryl phosphate (TAP)-impregnated talc, starch, silica gel and alumina with dimethyl sulfoxide - 1 M HCl 1:1. Detection with a 0.2% solution of ninhydrin in acetone.

J. Planar Chromatogr. 21, 299-304 (2008). HPTLC of 21 amino acids on silica gel impregnated with 5 % Ag ion with borate phosphate buffer pH 2.3. After drying at 50 °C detection by spraying with ninhydrin. With this system separation of alanine, phenylalanine and tryptophane could be achieved, as well as separation of alanine, tyrosine and tryptophan. Separation of these amino acids was neither achieved on conventional silical gel (without Ag impregnation) nor by addtion of buffered 5 % silver nitrate solution (pH 2.3) to the mobile phase.

J. Planar Chromatogr. 26, 31-36 (2013). TLC of a five-component mixture of the amino acids lysine (1), histidine (2), leucine (3), alanine (4) and glutamic acid (4) on silica gel with 1.0% aqueous urea solution pH 7.44. The hRf values of amino acids (1) to (5) were 38, 59, 78, 87 and 98, respectively. LOD for (1), (3) and (4) was 1.5 µg/zone, whereas for (2) and (5) it was 1.2 and 3.0 µg/zone, respectively.