H. TRAITLER, A. STUDER, R.E. KAISER (eds): Instrumental HPTLC, Institute for Chromatography, Bad Dürkheim, FRG (1987), 349- 359. Investigations on the application of chitin as a TLC stationary phase, especially a-chitin. Possibilities of obtaining mechanically and chromatographically stable precoated chitin layers. Application in the separations of amino acids and dyes.

J. Planar Chromatogr. 1, 231-234 (1988). TLC on silica and RP-silica having varied pH values with n-hexane, ether, ethyl acetate, toluene, chloroform, THF, benzene, acetone, dioxane, methanol, acetonitrile, methyl butyl ketone for TLC and distilled water for reversed-phase TLC. Detection under UV 366 nm. Discussion of the effect of surface pH value of silica on the retention of dansyl amino acids and the differences between TLC and reversed-phase TLC.

Inhibition of aminopeptidases by a-thiobestatin analogues. J. of Medicinal Chemistry 31, 2193-2199 (1988). TLC on silica with 5% methanol in chloroform , 20% ethyl acetate in dichloromethane, 1-butanol - acetic acid - water 4:1:1, 20% ethyl acetate in toluene, 20 % ethyl acetate in chloroform, 1-butanol - acetic acid - water - pyridine 15:3:12:10, dichloromethane - ethanol - acetic acid 70:30:1, dichloromethane - ethanol - NH3 70:30:1, 6% ethyl acetate in chloroform , 10% ethanol in chloroform , 20% NH3 in ethanol. Detection under UV and different reagents like ninhydrin, chloro-o-tolidine, 5% phosphomolybdic acid in ethanol and iodine.

J. of Medicinal Chemistry 32, 1497-1503 (1989). TLC of a-amino acids on silica with dichloromethane - methanol - acetic acid 18:2:1, dichloromethane - methanol 20:1 and 9:1, dichloromethane - methan- ol - acetic acid 14:2:1, ethyl acetate - pyridine - acetic acid - water 160:20:6:11, butanol - water - acetic acid 4:1:1 and ethyl acetate - pyridine - acetic acid - water 260:20:6:11.

J. Pharm. Biomed. Anal. 8, 1087-1090 (1990). TLC of hippuric acids on silica with chloroform - acetone - glacial acetic acid 40:10:5, of methylhippuric acids with toluene - methanol - nitromethane - acetic acid 5:8:2:2, for chlorohippuric acids with nitrobenzene - ethyl acetate - glacial acetic acid 45:8:5. Quantification by densitometry at 495 nm. TLC of mandelic and phenylglycilic acid on Silufor™ with toluene - acetonitrile - glacial acetic acid - acetone 30:8:4:1. Detection of aromatic acids by spraying with 0.5% tetrazolium blue in methanol - NH3 1:1, exposure to UV 366 nm for 75 min, afterwards quantification by densitometry at 475-540 nm. Comparison of the results with those obtained by GC. The TLC method allows a rapid simultaneous screening of many samples on the same plate.

Biochemical Systematics and Ecology 20, 343-349 (1992). TLC of cardenolides on silica with chloroform - methanol 8:2 or 85:15. Visualization by spraying with Kedde’s reagent. TLC of amino acid derivatives on silica with butanol - acetone - water 8:2:2. Visualization by spraying with a 2% ethanolic solution of ninhydrin.

Chromatographia 36, 297-301 (1993). Investigation of the TLC behavior of 12 dansyl DL amino acids on RP-18 silica developed with aqueous - organic solutions containing bovine serum albumin as chiral complexing agent. Study of the influence of mobile phase pH and ionic strength and the concentration of the chiral complexing agent and the organic modifier on enantiomeric resolution. Comparison of the selectivity factors of dansyl amino acids with those of the corresponding DNP, DNPy, and Fmoc amino acids. Also comparison with column techniques.

Chinese J. Chromatogr. (Sepu) 14, 158-160 (1996). Two-dimensional TLC of 17 amino acids in Bos grunniens linnaeus horn hydrolysate on cellulose - silica 5:2 with isopropanol - ethyl acetate - acetone - methanol - isopentanol - NH3 - water 9:3:3:1:1:3:3 and butanol - acetone - isopropanol - formic acid - water 18:8:8:3:6. Detection by spraying with 0.5 % ninhydrin in acetone.