J. Chromatogr. 520, 402-410 (1990). Study of the reverse phase TLC retention of some organic electrolytes on RP-18 silica. Optimization of the retention and selectivity for some N-phenylamides of benzoylacetic acid by changing the content of the organic modifier methanol. Comparison with ion-pair reverse phase HPLC.

J. Chromatogr. 556, 81-84 (1991). Presentation of a survey of published optimization procedures in TLC. In one-dimensional TLC, selection of mobile phase through either computerized or non-computerized methods such as simplex, overlapping resolution map. Proposal of resolution-based criteria and others such as principal component analysis, etc. In two-dimensional TLC, the aim is to find two systems exhibiting the least correlation.

Anal. Letters 27, 1031-1054 (1994). The method is reported to be capable of finding the best system and the optimal combination of two or more TLC systems according to the partition coefficients.

J. Planar Chromatogr. 10, 358-361 (1997). TLC of seven PAHs (7-, 8-hydroxy-, trans-7,8-, trans-9,10-dihydroxybenzo(a)pyrene, benzo(a)pyrene, 1,2,5,6-dibenzanthracene, chrysene) on cellulose acetate with various solvent systems and application of principal-components analysis (PCA) to the experimental results in order to find the optimum solvent system for the separation of the hydrocarbons of interest.

J. Liq. Chrom. & Rel. Technol. 27, 1467-1482 (2004). HPTLC of 8 phenol derivatives, 8 anilines and 5 quinolines on amine-, diol- and cyano-phases with mobile phases of different eluent strengths of the polar modifier. Detection under UV light at 254 nm. For the separation of phenols and aromatic amines the aminopropyl phase was most selective. The cyanopropyl phase was used for quinolines.

Robustness testing in OPLC. J. Planar Chromatogr. 8, 188-193, (1995). OPLC of vinblastine, deacetoxyvinblastine and leurosine on HPTLC silica (aminobonded) with hexane - dichloromethane - acetone 65:13:21:0.9. Evaluation by densitometry at 298 nm.

J. Planar Chromatogr. 15, 244-251 (2002). TLC and HPTLC of alkylamides, phenylpropanoids and fructofuranosides from Echinacea species and common adulterants on silica gel (predeveloped with methanol and dried at 120°C). TLC of alkylamides with hexane - ethyl acetate 2: 1. Detection under UV 254 nm and, after derivatization with anisaldehyde reagent, in white light and at UV 366 nm. HPTLC of phenylpropanoids (e.g. caftaric acid, cynarin, chicoric acid, chlorogenic acid, caffeic acid, echinacoside) with ethyl acetate - ethyl methyl ketone - formic acid - water 5:3:1:1 with chamber saturation. Visualization under UV 366 nm after derivatization with natural products reagent (diphenylboric acid 2-aminoethylester). HPTLC of fructofuranosides with n-butanol - 2-propanol - water 1:3:1 without chamber saturation. Visualization by use of aniline-diphenylamine reagent. These HPTLC methods have been developed and peer verified in accordance with the AOAC guidelines.

J. Planar Chromatogr. 28, 106-114 (2015). An overview of adsorption characteristics of 3-cyanopropylsiloxane-bonded silica gel, and its application as sorbent are presented. Due to the unique characteristics caused by the presence of both hydrophilic and hydrophobic parts on its surface, 3-cyanopropylsiloxane-bonded silica gel can be used for the separation of various classes of substances in both normal- and reversed-phase chromatography.