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.

J. Agric. Food Chem. 56, 8050-8057 (2008). HPTLC of [2-14C]-cymoxanil in the cultures (medium and mycelium) and in the cell-free extracts of Botrytis cinerea on silica gel with hexane - ethyl acetate - acetic acid 70:30:1. The most polar products were separated on RP-18 (impregnated with a methanolic solution of tetrabutylammonium bromide 70 mM and dried at 80 °C for 5 min) with phosphate buffer (0.01 M, pH 6) – methanol 11:9. Detection by autoradiography. The hRf value of cymoxanil was 35 on silica gel. Different metabolites were detected using both stationary phases.

62nd Indian Pharmaceutical Congress Abstract No. F-266 (2010). TLC of metformin and pioglitazone, extracted with methanol from bulk and pharmaceutical formulation, on prewashed silica gel with toluene – methanol – triethylamine 40:10:1. The hRf values of metformin and pioglitazone were 25 and 50, respectively. Quantitative determination by absorbance measurement at 230 nm. The linearity was in the range of 100-1000 ng/band for metformin and 200-1200 ng/band for pioglitazone: the correlation coefficients (r) were 0.9958 and 0.9992, respectively.

J. Ethnopharmacol. 148, 869-879 (2013). HPTLC of cantharidin in the blister beetles Epicauta hirticornis and Mylabris cichorii on silica gel with ethyl acetate - chloroform. Identification by absorbance measurement at 254 nm. The hRf of cantharidin was 78 and structurally defined as hexahydro-3a,7a-dimethyl-4,7-epoxyisobenzofuran-1,3-dione.

Acta Chimica 116, 131-140 (1984). TLC of benzimidazole, 2-aminobenzimidazole on silica with chloroform - CCl4 - methanol 8:5:1. Anodic oxidation of 2-amino-benzimidazole followed up by TLC.