Acta Pharmaceutica Hungarica 58, 247-265 (1988). Study of the determination of hydrophobic constants by TLC. N-Heterocyclic substances were used as model mixtures.

J. Chromatogr. 553, 459-466 (1991). Study of OPLC retention behavior of minoxidil and its intermediates using silica gel layers impregnated with tricaprylmethylammonium chloride (TCMA). Investigation of the influence of the concentration of TCMA adsorbed on the silica gel, and of the pH and the ionic strength of the eluents on the retention of the solutes, etc.

J. Planar Chromatogr. 7, 484-486 (1994). TLC of ß- and g-quinolinyl sulfides (1,4-dithiinoldiquinolines, o,o'-dimethylthiodiquinolinyl sulfides, unsubstituted ß,g-diquinolinyl sulfides, methylthioquinolines) on silica with chloroform - methanol 98:2 and on aluminium oxide with carbon tetrachloride - chloroform 85:15. For determination of values of lipophilicity index, RMO, the TLC plates were impregnated by overnight predevelopment with hexane - paraffin oil 95:5. Aqueous methanol (concentration between 60 and 80%) was used as eluent. Inspection under UV 360 nm.

CBS 93, 14-15 (2004). HPTLC of heterocyclic aromatic amines on silica gel WRF (prewashed with methanol by chromatography followed by drying at 120 °C for 30 min) with a 6 step gradient with diethyl ether, methanol and chloroform, with alkaline conditioning via gas phase over max. 60 mm. Quantitative determination by multi-wavelength scan in absorbance mode at 252, 262, 316 nm and fluorescence measurement at 366/>400 nm. Polynomial evaluation via peak area and height. Limit of quantitation is between 1-45 ng absolute on the plate. Online coupling with MS by use of a new extractor developed by Luftmann.

Pyrido (3,4-d) aminopyridazines, I. Separation and structure compounds obtained by hydrolysis of 1,4-dichloropyride (3,4-d) pyridazine. Acta Chimica 112, 487-499 (1983). TLC of 1-chloropyrido- (3,4-d)-pyridazine-4- (3H)- one; 4-chloropyride- (3,4-d)-pyridazine-1- (2H)-one on silica with chloroform - methanol - NH3 50:20:3.

J. Liquid Chromatogr. 14, 3311-3355 (1991). TLC of some N-carbamoyl-3,5-dimethyl-4-arylazopyrazoles on silica, impregnated with various surfactants i.e., 1% acetoacetanilide, 1% triton X-100, and 1% tetrabutylammonium bromide, with benzene – ethyl acetate 9:1. Interpretation of a correlation of Rf value with Hammett substituent constant.

J. Planar Chromatogr. 15, 280-285 (2002). OPLC of trigonelline on silica gel with n-propanol - methanol - water 20:3:30. Detection under UV 270 nm. OPLC of ascorbigen on silica gel with chloroform - methanol - acetic acid 90:10:1. The separation was monitored by densitometry, and visually after derivatization with phosphomolybdic acid.

Chromatographia 21, 509-512 (1986). TLC of hematoporphyrin IX (Hp) and its metal complexes on octyl-, or octadecyl-bonded silica with various compositions of methanol - phosphate buffer mixtures. The mobility order for the compounds: Cu-complex < Ni-complex < Hp < Zn-complex. Recommendation of the combination of octadecyl-bonded silica with methanol - phosphate buffer (pH 3) for the separation of the 4 compounds.