J. Microchem. 36, 113-117 (1987). TLC of amino acids on cellulose with 2x n-butanol - acetic acid - water 8:2:2. Detection under UV, polarographic determination after elution with nitric acid and derivatization.

J. Chromatogr. 463, 139-145 (1989). Description of a new quantification method, laser pyrolysis, for TLC without the need of visualization process in detecting any organic compound. Use of 2 amino acids, 2 pesticides as test samples. Complete analysis time less than 20 min. Comparison of sensitivity and linearity with densitometry. This technique combines the advantage of the separation power of TLC and GC detection methods. Detection limits, 100 ng for phenylalanine with FID and 20 ng for methoxychlor with ECD.

Acta Alimentaria 10, 73-78 (1989). TLC of methionine and of protein fractions on silica with phenol - water 3:1.

J. Chromatogr. 537, 494-496 (1991). TLC of 20 amino cards on silica with butanol - acetic acid - water 40:5:7. Detection by spraying with a freshly prepared solution of formaldehyde (37%, 15 mL) + acetyl acetone (7.8 mL), diluted to 100 mL with acetate buffer (pH 4.7), and by heating at 100 °C for 10 min. Detection limits, 0.26 x 10-4 - 6.9 x 10-4 mmol. Comparison of the sensitivity of this reagent with ninhydrin reagent.

J. Planar Chromatogr. 6, 43-50 (1993). Separation of the 20 common protein PTH amino acid derivatives by AMD on silica. The wide range of polarity of the sample and the limited separation length dictated by the range of mobile phase velocities available prevented the identification of any single solvent gradient which could simultaneously provide adequate resolution of the PTH amino acid derivatives located at the front or end of the chromatogram. A more productive approach was to employ group separations of the polar and moderately polar PTH amino acid derivatives in 2 runs.

Identification of an extract of Althea officinalis and determination in a medical herb tea. Deutsche Apotheker Zeitung 135, 1147-1149 (1995). Sample preparation via cation exchange column to obtain several amino acids. TLC on silica with 1-butanol - acetic acid - water 75:19:19 including 0.25 % ninhydrin. Quantification of alanine by densitometry after heating at 496 nm. Recovery rate 99%.

Chromatogr. (Sepu) 14, 259-263 (1996). Two dimensional TLC of 30 amino acids, 40 organic acids and 20 nucleosides and related compounds on cellulose - silica with 1) isopropanol - ethyl acetate - acetone - methanol - para-amyl alcohol - NH3 - water 9:3:3:1:1:3:3, butanol - isopropanol - acetone - formic acid - water 18:8:8:3:6, 2) tert-butanol - ethanol - NH3 - water 5:6:1:3, isopentanol - petrol ether - ethanol - formic acid - propionic acid - water 45:100:25:20:1:1, 3) isopropanol - ethyl acetate - methanol - NH3 - water 5:3:1:3:1, isopropanol - saturated (NH4)2SO4 - water 4:77:19, for both direction, respectively. Detection under UV 254 nm, by spraying with 0.1 % acridine in ethanol, by spraying with ninhydrin-cadmium acetate reagent. Detection limit 10-10 - 10-11 mol, 2x10-8 - 5x10-8 mol, and 1x10-8 - 3x10-8 mol, respectively.

Chinese Anal. Chem. (Fenxi Huaxue) 26, 1047-1051 (1998). TLC of amino acids on silica gel with 1) chloroform - methanol - NH3 conc. 2:2:1, 2) phenol - water 3:1. Detection under UV 254 nm. Identification of tryptophan and histidine by FT-SERS. Detection limit 8 µg.