J. Planar Chromatogr. 2, 383-386 (1989). TLC separation of dyes and plant pigments on different modified silica stationary phases (cyclic diols, cyanopropyl, carboxylic ester) with toluene, isooctane - methanol - diethylether 7:1:2 as mobile phase and three methods of development - traditional vertical tank, experimental horizontal sandwich apparatus and an experimental over-pressure device. - The variation of the stationary phase can be used to gain selectivity advantages in chromatographic separations.

Chem. Anal. (N.Y.) 108, 15-47 (1990). A review with 8 references on the use of surface-modified reversed phase sorbents for HPTLC. Discussion of the surface reactions. Application in the separation of cholesterol and its bile acid metabolites and a mixture of steroids.

J. Planar Chromatogr. 3, 280-282 (1990). TLC of Re, Mo, V, W on Polichrom A (a copolymer of mixed 1,4- and 1,5-di(methacryloyloxymethyl)naphthalene and styrene with starch, dextrin of a polyvinyl alcohol containing 10-14% acetate groups as binder), with 0.5 hydrochloric acid - ethanol 9:1 as mobile phase. Detection by spraying first with a saturated solution of tin chloride in conc. HCl and second with a saturated aqueous solution of ammonium rhodanide.

J. Planar Chromatogr. 6, 34-37 (1993). Use of chitin and derivatives prepared by treatment of chitin with transition metals for the separation of optical isomers of amino acids: good separation on chitin-Cu with binary or ternary mixtures of organic solvents. The dependence of hRf values on the composition of the mobile phases has been demonstrated.

J. Chromatogr. 685, 360-364 (1994). TLC of amino acid racemates on the title plates with 1) 2-propanol - water 7:3, 2) phenol - water 4:1, 3) butanol - acetic acid - water 3:1:1. Detection by spraying with 0.1% ethanolic ninhydrin solution and heating for 5 minutes at 90 °C. Discussion of the enantiomeric separation mechanism.

J. Planar Chromatogr. 11, 84-89 (1998). Improvement of the DRIFT (diffuse reflectance infrared Fourier spectroscopy) spectra and increase of the signal-to-noise ratio by application of a combination of silica gel 60 and a weak infrared-active, reflection-enhancing material. Of the reflection-enhancers tested magnesium tungstate proved to be the most suitable; the optimum proportion was 50%. For this type of layer the signal-to-noise ratios for caffeine, paracetamol, and phenazone were increased by factors of 3.4, 3.1, and 2.3, respectively, compared with those obtained on pure silica gel 60. Use of material of small mean particle-diameter and narrow particle-size distribution provided an almost optimum diffuse reflecting surface.

J. Planar Chromatogr. 14, 234-236 (2001). In contrast to 'traditional' layers used in TLC and HPTLC, the new sorbent is no longer based on granular material, but consists of monolithic layers with a defined pore structure based on a silica gel matrix. Furthermore, no binder is needed to fix the layer on the plate. The layer thickness of approx. 10 µm is considerably less than that of conventional layers. The exciting properties of the new UTLC silica gel plates, especially their selectivity and separation efficiency, reduction of analysis time and solvent consumption, is demonstrated by separations of steroids, pesticides, and some dyes.

Proc. Intern. Symp. on Planar Separations Plan. Chrom. 71-74 (2003). Ultra-thin layers exhibit a thickness of 10 mm and consist of monolithic silica eliminating the need for a binder to fix the layer on the glass surface of a plate resulting in the combination of short migration distances, fast development times, and extremely low eluent consumption. LuxPlate, a new TLC plate, is characterized by a higher amount of fluorescent indicator and are twice as bright under UV light when compared to conventional TLC plates.