Chim. Acta 67, 334-351 (1984). Zur Kenntnis des Faktors F 430 aus methanogenen Bakterien: Struktrur des proteinfreien Faktors. (Factor F 430 from methanogenic bacteria: structure of the protein-free factor). HPTLC and PLC of highly complex nickel-containing porphinoids on silica with ethyl acetate - acetic acid - water 5:2:2, butanol - acetic acid - water 4:1:1 and trifluoro ethanol - acetic acid - water 4:1:1. Extraction from cells of methanobacterium thermoautokrophicum using numerous PLC steps. HPTLC allows the separation of isomeric porphinoids.

J. Planar Chromatogr. 4, 319-322 (1991). TLC of 15 aromatic amines on silica, alumina and cellulose with numerous solvents in different compositions. 0.1% aqueous solutions of sodium chloride or hydrochloric acid are considered as excellent eluents for achieving selective separation of diphenylamine or carbazole from indole. Detection i.a. by spraying with 1% ethanolic solution of dimethylaminobenzaldehyde containing 15-20 mL conc. sulfuric acid.

J. Planar Chromatogr. 17, 233-237 (2004). TLC of biogenic amines (dopamine, adrenaline, noradrenaline, 3-methoxytyramine, methanephrine, normethanephrine, vanillylmandelic acid, homovanillic acid, 3,4-dihdroxyphenylacetic acid, 3,4-dihydroxyphenylethyleneglycol, 3-methoxy-4-hydroxyphenylethyleneglycol) and methylxanthines (1-methylxanthine, 7-methylxanthine, theophylline, paraxanthine, theobromine, caffeine) on silica gel with mobile phases comprising a non-polar or weakly polar diluent (chloroform, heptane, or hexane) and a polar modifier (tetrahydrofurane, dioxane, acetone, or ethyl acetate). Examination under UV light or detection with a solution of iron(III) chloride (5 g) and iodine (2 g) in 50 mL of 20 % aqueous tartaric acid. Relationship between Rf values and mobile phase composition was investigated.

The Rf values of 6 compounds were given. The procedure is suitable for the separation of aminophenyl porphyrins which are similar in structure and nature.

J. Planar Chromatogr. 14, 449-453 (2001). Preparation of complexes of hydroxy- and alkyloxytetraphenylporphyrins with Cu(II), Zn(II), and Ni(II) and investigation of their chromatographic behavior in adsorption and partition chromatography. The correlation between topological indexes and the screening effect and chromatographic retention was studied. TLC of 30 metalloporphyrins on silica gel and RP-18 with carbon tetrachloride - chloroform and methanol - chloroform, respectively, in different volume proportions. Good separations were obtained by use of silica gel with carbon tetrachloride - chloroform 1:1 and on RP-18 with methanol - chloroform 2:3.

J. Liq. Chromatogr. Relat. Technol. 33, 109-117 (2010). TLC of ursodeoxycholic acid on silica gel with n-hexane - ethyl acetate - acetic acid 22:22:5 at room temperaure in a horizontal chamber. The hRf value was 48. Detection by spraying with 10 % sulfuric acid and heating at 120 °C for 20 min. Quantitative determination by densitometric scanning at 360 nm. LOD and LOQ was 0.014 and 0.041 mg/spot, respectively. The linearity range was 0.030-0.120 mg/spot. The correlation coefficient r was 0.0063. The accuracy of the quantitative analysis of ursodeoxycholic acid in extracts from examined pharmaceutical formulations was 95.3 % and 97.2 %, and the precision was 5.29 and 6.15 % in tablets and capsules, respectively.

Part 1. Thin layer chromatography. J. Planar Chromatogr. 9, 98-102 (1996). TLC separation of ascorbigen, methylascorbigen, and derivatives on silica with benzene - ethanol 4:1 or chloroform - methanol - acetic acid 90:100:1 and on RP 8 with acetonitrile - 0.1 M ammonium acetate (pH 5.8) 6:4 or with methanol - 0.1 M ammonium acetate (pH 5.8) 7:3. Detection under UV 254 nm or by using either iodine vapor or Prochazka's reagent (for indole rings) or ammonium molybdate. Densitometry at the optimum wavelengths which were determined by spectral measurement for each method of visualization.

J. Planar Chromatogr. 4, 333-334 (1991). TLC separation of pyridine, g-picoline, pyrazine, quinoxaline quinoline, their dimers and derivatives on silica with carbon tetrachloride - ethanol - acetone 50:1:2. Detection by spraying with Dragendorff’s reagent and intrinsic color.