J. Planar Chromatogr. 18, 344-348 (2005). TLC of beta-diketonato complexes of the type M(acac) 3-n(phacphac)n and M(acac)3-n(phSacphSac)n, where M represents cobalt(III) or chromium(III), acac is the pentanedionato ion, phacphac the 1,3-diphenyl-1,3-propanedionato ion, and phSacphSac the 3-mercato-1,3-diphenylprop-2-en-1-thione ion (n= 0-3), on RP-18 with mixtures of tetrahydrofuran, acetonitrile, or acetone (as organic modifier) with water.

J. Planar Chromatogr. 18, 176-180 (2005). OPLC separation of alkaloids on silica gel using different mobile-phase velocities from 100 to 400 µL/min and investigation of this effect on properties such as retardation factors, reproducibility, efficiency, number of theoretical plates, HETP, and resolution. OPLC of tertiary alkaloid standards (allocryptopine, protopine, chelidonine) and quaternary alkaloid standards (chelerythrine, chelilutine, sanguinarine, and chelirubine) on silica gel with toluene - ethyl acetate - methanol 14:3:3 for tertiary alkaloids and toluene - ethyl acetate - methanol 83:15:2 for quaternary alkaloids.

J. Planar Chromatogr. 18, 319-322 (2005). HPTLC of emodin and phenolic acids (protocatechuic, homoprotocatechuic, caffeic, syringic, vanillic, ferulic, p-hydroxyphenylacetic, alpha-resorcylic, p-coumaric, gallic and ellagic acid) on silica gel in horizontal chambers with toluene - dichloromethane - ethyl acetate 4:4:1. Also two-dimensional TLC of phenolic acids on cellulose with benzene - methanol - acetic acid - acetonitrile 16:2:1:1 in the first direction and sodium formate - formic acid - water 10:1:200 in the second direction. After drying the chromatograms were observed under UV light at 254 nm before and after treatment with ammonia vapor. Derivatization was performed by spraying with either diazotized sulfanilic acid in 20 % sodium carbonate solution or with 2 % aqueous iron(III) chloride. Detection limits between 10 and 64 ng. Videodocumentation and quantitation by densitometry.

J. Planar Chromatogr. 18, 98-103 (2005). Salting-out TLC (SO TLC) of five ACE inhibitors and their active degradation products (enalapril, enalaprilat, quinapril, quinaprilat, fosinopril, fosinoprilat, lisinopril, cilazapril, cilazaprilat) on silica gel, cellulose, and polyacrylonitrile with aqueous ammonium sulfate solutions of different concentrations. Increasing the salt concentration in the mobile phase led to increased RM values for all substances. For comparison TLC on RP-18 with methanol - water. Detection by exposure to iodine vapour.

J. Planar Chromatogr. 19, 124-128 (2006). Determination of log P values of 29 biologically active chalcone and cyclic chalcone analogues E-2-(X-benzylidene)-1-indanones and E-2-(X-benzylidene)-1-tetralones by an optimized and validated RP-TLC method. RP-TLC was performed on silanized silica gel with methanol - water 3:2. The experimentally determined log P(TLC) values were compared with the log P values predicted by use of the CLOGP program.

IV. Comparison of separation of studied bile acids by the use of cluster analysis. J. Liq. Chrom. & Rel. Technol. 27, 2987-2995 (2004). TLC of bile acids (cholic, glycocholic, glycolithocholic, deoxycholic, chenodeoxycholic, glycodeoxycholic, and lithocholic acid) on silica gel and a mixture of silica gel and Kieselguhr with n-hexane - ethyl acetate - acetic acid in various volume compositions. Detection with 10 % aqueous sulfuric acid followed by heating at 120 °C for 20 min. On silica gel the separation of glycocholic from glycodeoxycholic acid was difficult, on the mixed silica gel - Kieselguhr layer the separation of cholic acid from glycolithocholic acid. The obtained results indicate that similar analysis can be an alternative method for the estimation of chromatographic separations of studied bile acids.

Talanta 60 (5), 945-953 (2003). TLC of linezolid from its alkaline degradation product on silica gel with isobutanol - ammonia 9:1. Quantitative determination by densitometric measurement at 244 nm. The proposed method and two other methods (based on spectrophotometry) were successfully applied to the determination of the drug in bulk powder, in laboratory prepared mixtures with its degradation product and in commercial tablets.

J. Liq. Chrom. & Rel. Technol. 27, 2421-2439 (2004). TLC of e. g. delta8-tetrahydrocannabinol, cannabigerol, cannabigerolic acid, cannabidiolic acid, and (-)-delta9-(trans)-tetrahydrocannabinolic acid on RP18 with methanol - 5 % acetic acid 19:1. Detection under UV light at 254 nm and by spraying with modified anisaldehyde - sulfuric acid spray reagent. For selective detection of cannabinoids, the plate was sprayed with 0.5 % fast blue B salt in water, followed by 0.1 M NaOH.