J. Liq. Chromatogr. Relat. Technol. 39, 257-263 (2016). Gradient TLC of a mixture of 10 dyes on RP-18 with methanol in buffer pH 3. Development in a new designed chamber that enabled to perform gradient elution with one void volume of the mobile phase and did not require the special procedure of chromatographic plate preparation._x000D_

J. Chromatogr. A 1534, 179-187 (2018). Investigation of the influence of pH of the mobile phase buffer on retention of peptides in both normal phase (NP) and reversed phase (RP) HPTLC systems with C18 silica-based adsorbent as the solid phase. Comparison of the influence of pH on retention and/or migration distance of peptides in separation systems of HPTLC and pressurized planar electrochromatography (PPEC) techniques. It was found that the change of pH of the mobile phase buffer can be used for two-dimensional HPTLC separation of peptides, but much stronger change of separation selectivity can be achieved by overall inversion of separation system type (NP/RP). Influence of the mobile phase pH on selectivity of peptide separation in PPEC is different than that in HPTLC, due to the significant share of electrophoretic effect in mechanism of separation and better selectivity of separation by PPEC, however the change of pH affects the efficiency of the separation system in both techniques, so it can be used for optimization of separation conditions. Discussion of some modifications of PPEC equipment and materials useful for application of this technique in the field of peptide analysis.

Budapest Chromatography Symposium, June 13, 1985. Separation of serum neutral lipids and cholesterol ester on silica with toluene - CCl4 1:3 and toluene. Separation of phospholipids with chloroform - methanol - acetic acid - acetone - water 30:9:4:2.5:2.

J. Chromatogr. 355, 211-220 (1986). Reversed-phase charge-transfer TLC of 1-phenyl-2-nitro-3-acetoxy-prop-1-ene on 5 % paraffin-impregnated silica using water - methanol 1:1 with and without dissolved amino acids or glutathione (pH value has no significant effect on the interaction). Detection under UV 254 nm and by ninhydrin method. Evaluation by densitometry at 510 nm.

Chinese J. Chromatogr. 6, 244-246 (1988) (Sepu). TLC of seven antiepileptics on silica with chloroform - diisopropyl ether - ethanol - NH3 20:20:5:3. Investigation of the influence of the activity of the adsorbent. Optimization by selecting proper preconditioning solvents, adjusting preconditioning time and employing suitable developing chamber configurations.

Chromatographia 27, 49-52 (1989). TLC of aflatoxins on silanized silica by bi-directional development with diethyl ether and chloroform - xylene - acetone 6:3:1. Measurement by fluoro-densitometry. Detection limits, 0.8 (B1), O.4 (B2), 1.7 (G1) and 0.4 (G2) µg/kg. R.S.D., 1.7% (B1), 2.5%(B2), 3.1%(G1) and 3.1% (G2). Comparison with two-dimensional TLC method.

Proc. 6th Int. Symp. Instrum. Planar Chromatogr., (Interlaken 1991), Inst. Chromatogr., Bad Dürkheim, FRG, 83-90 (1991). A new designed eluent delivery system allows a kind of gradient elution on TLC. Dye samples and lanatosides were developed on silica. Visualization of lanatosides with chloramine-T and trichloroacetic acid. Scanning by fluorescence 366/>400 nm. Gradient elution of several mobile phase mixtures was compared to isocratic development.

J. Planar Chromatogr. 3, 251-255 (1990). New layer for problematic separation: TLC of 10 organic acid herbicides on silica - calcium sulfate layers 1:4 with different solvent systems. Identification by spraying with alkaline ethanolic solution of bromophenol blue.