Proc. Intern. Symp. on Planar Separations Plan. Chrom. 251-255 (2003). TLC of lauric, myristic, palmitic, stearic, and arachidic acid and lauryl, myristyl, palmityl, stearyl, and arachyl alcohols on silica gel, RP-2, RP-8, and RP-18, impregnated with 1, 5, and 10% solutions of squalane and octadecane in hexane, with methanol - water 39:1. Detection by exposure to iodine vapor.

J. Liq. Chromatogr. Relat. Technol. 36, 2512-2523 (2013). The paper described the influence of several operating variables of online injection into the pressurized planar electrochromatography (PPEC) separation system. Variables that enable narrow and symmetrical peaks such as sample volume, flow velocity, shapes of the grooves and polarization potential were discussed.

J. Planar Chromatogr. 12, 373-377 (1999). Description of a new multi-applicator for simultaneous deposition of up to 15 samples, successively on several plates of different sizes. Acepromethazine was used as test analyte, and plates were scanned at 375 nm. The multi-applicator furnished reliable results, both qualitatively - good inter-capillary reproducibility, and adaptibility - and quantitatively - satisfactory linearity, reproducibility, correlation with an autosampler.

Chinese J. Modern App. Pharm. 25 (4), 348-350 (2008). Description of an apparatus for the temperature control of the TLC separation process. The operational temperature below room temperature is adjusted by using semi-conductor refrigeration. Temperatures above room temperature are controlled by hot thread heating. Good reproducibility of hRf values is obtained with the apparatus.

J. Planar Chromatogr. 26, 190-195 (2013). Enlarging of the two-phase microcircular planar liquid chromatography (PLC) into a three-phase chromatographic technique by adding gas flow containing specific chemicals like acids, bases, alcohols, esters, hydrocarbons. The flow speed of 2 L/min flushes the gas volume over the 100 mm × 100 mm PLC plate 200 times per minute at room temperature. Reproducibility was obtained in the ±0.1 % range in qualitative evaluations and ±0.5 % down to ±0.05 % range for quantitative analyses.

J. Chromatogr. A 1446, 141-148 (2016). Investigation of stationary phase gradients for chelation TLC as a tool to separate a mixture of metal ions. Preparation of the gradient stationary phases using controlled rate infusion from precursors containing mono-, bi-, and tri-dentate ligands, specifically 3-aminopropyltriethoxysilane, N-[3-(trimethoxysilyl)propyl] ethylenediamine, and N-[3-(trimethoxysilyl)propyl] diethylenetriamine. Confirmation of the presence and the extent of gradient formation using N1s X-ray photoelectron spectroscopy. The results showed that the degree of modification was dependent on the aminosilane precursor, its concentration, and the rate of infusion. Comparison of the separation of four transition and heavy metals (Co2+, Pb2+, Cu2+, and Fe3+) by TLC on gradient and uniformly modified plates with a mobile phase containing a stronger chelating agent, ethylenediaminetetraacetic acid. Manipulation of the retention of the metal ions by varying the surface concentration of the chelating ligands. The order of retention on unmodified plates and on plates modified with a monodentate ligand was Fe3+>Cu2+∼Pb2+∼Co2+, while the order of retention on plates modified with bi- and tri-dentate ligands was Fe3+>Cu2+>Pb2+∼Co2+. Fe3+ and Cu2+ were more sensitive to the concentration of chelating ligand on the surface and showed lower hRf values with increasing ligand concentration than Pb2+ and Co2+. Complete separation was achieved using a high concentration of the tridentate ligand coupled with a longer time for modification, giving a retention order of Fe3+ > Cu2+ > Co2+ > Pb2+.

J. High Resol. Chromatogr. 8, 265-266 (1985). Separation of creosote extract on alumina with hexane (flow rate 4 ml/min, dropping from a 125 ml-separatory funnel) for the elution of saturated aliphatic compounds to the edge of the plate and with benzene for the PAH band (until a Rf of 0.75).

J. Chromatogr. 333, 69-81 (1985). Study on the influence of temperature gradient for different chromatographic systems using the tank developing configuration. Illustration of the method by chromatography of dansyl amino acids and aflatoxins. The enantiomers of the dansyl amino acids could be separated by 2-D-RP TLC with partial separation, then after spraying with Cu complex of N,N-di-n-propyl-L-alanine by separation in a temperature gradient. Aflatoxins B1, B2, G1, G2 were separated on silica with a temperature gradient of 20/min. over 150-180 min.