J. Planar Chromatogr. 30, 97-105 (2017). Review of current applications of room temperature ionic liquids on planar chromatography as mobile phases. Methylammonium, ethylammonium, propylammonium, isopropylammonium, butylammonium, s-butylammonium, dipropylammonium, tributylammonium were reported to be used as replacements for organic solvents in binary systems. As mobile phase additives, room temperature ionic liquids were used for the separation of peptides and basic drugs in both normal phase and reversed phase chromatography with an emphasis on their role as masking agents. The authors suggested that given the large number of possible cation and anion combinations, systematic methods that characterize solvation properties for both ionic liquids and organic solvents are required.

Chromatographia 18, 628-632 (1984). Investigation of the effect of the vapor phase and other influences on TLC. Comparison of the relationship of time vs. developing distance and flow rate. Dyes used as model substances.

Anal. Chem. 58, 582-584 (1986). TLC of 9 racemic mixtures, 3 diasteomeric mixtures and 6 structural isomers on-cyclodextrin-bonded silica with methanol -1 % aqueous triethylammonium acetate (pH 4.1) 5:5. Detection under UV at 254 nm. Evaluation of different silica preparations.

J. Chromatogr. 370, 63-73 (1986). Derivatization of a general equation for the final Rf value of a solute chromatographed under the conditions of stepwise gradient elution with one void volume of mobile phase. Demonstration of a computer program for simulation of stepwise gradient TLC which can be used for optimization. The elution process and the distance travelled by the spots as a function of eluent volumn was illustrated for both displacement adsorption and reversed-phase chromatography.

Miniaturized generators for continuous and stepwise gradients. J. Chromatogr. 446, 275-282 (1988). Description of a miniaturized generator of continuous gradients for equilibrium sandwich chambers with a glass distributor controlling the gradient profile by the initial concentration of weaker eluent and its initial volume and by the composition and rate of delivery of the stronger eluent. Comparison of densitograms from isocratic and gradient TLC. Improvement of the separation under gradient elution conditions.

J. Liquid Chromatogr. 12, 235-246 (1989). Comparison of two data analysis methods, overlapping resolution mapping (ORM) and ideal separation (IS), to optimize the multiple-component mobile phase composition for HPTLC. Evaluation of the separation of 11 anthraquinone dyes using the two methods to select the best mixture of three blends for the mobile phase, composing of benzene, chloroform, tetrahydrofuran, and with each blend having a Snyder’s solvent strength of e = 0.3. Discussion of the results from the two methods. Presentation of resolution contour map for both ORM and IS to find regions of optimum mobile phase composition.

J. Planar Chromatogr. 3, 352-354 (1990). Proposition of a new OPLC development technique where the separation distance can be freely increased by special arrangements of the layers. Several plates are placed on top of each other to extend the developing distance. The end of the first (uppermost) chromatoplate has a slit-like perforation to enable the mobile phase to flow to a second layer where migration continues until the opposite end of the plate. Arrangements for identical plates, different stationary phases, sample clean-up, simultaneous sample application and reconcentration, preparative development, combination of linear and triangular development modes, at low, medium or high external operating pressures are mentioned.

J. Liquid Chromatogr. 15, 1673-1679 (1992). Description of a vacuum driven forced flow planar chromatography device.