J. Planar Chromatogr. 3, 307-310 (1990). The liquid crystalline method for the visualization of thin layer chromatograms involves mapping the chromatogram by transferring the organic substances from the plate to a liquid crystal layer. Because the properties of the substrate have no significant influence on the transfer of the substances to be mapped it should be possible to use liquid crystal detectors to detect substances adsorbed on any substrate, can be used to visualize spots mapped from carbon layers. Method demonstrated with toxic substances used in warfare (o-ethyl-s-diisopropylaminoethyl ester of methanephosphoric acid) pesticides.

J. West China Univ. Med. Sci. (Huaxi Yike Daxue Xuebao) 24, 194-197 (1993). Presentation of a novel stable fluorescent reagent CGE(N) for the detection of compounds containing amino groups with TLC detection of glucine as example. Fluorescent excitation at 277 nm and emission wavelength of the spot at 356 nm, resp. Detection limit of 240 ng/spot.

Chromatographia 48, 548-554 (1998). Study of double spray in TLC to enhance fluorescence of dansyl derivatives, 200-360 fold by spraying with 20% triethanolamine in propane-2, followed by 30% paraffin oil in hexane, spots are stable for one month. Visual detection limits, 1-6 p mole per spot. Use of the graphical method to explain the phenomena.

J. Planar Chromatogr. 17, 314-315 (2004). Separation of 22 amino acids on silica gel with n-propanol - water 7:3. Detection by spraying with 1) 5 % 4-hydroxyacetophenone in acetone, followed by drying in air until all solvent had completely evaporated, and heating in an oven at 110 °C for 10 min, and, after cooling, spraying with 2) 0.4 % isatin-5-sulfonic acid (sodium salt) in ethanol - water 4:1, followed by drying in air and heating for 10 min at 110 °C. Detection limits were betwen 0.1 and 2 µg.

J. Planar Chromatogr. 25, 571-574 (2012). HPTLC of theanine in tea extracts on silica gel with n-butanol - acetone - acetic acid - water 7:7:2:4. Detection by dipping into a ninhydrin reagent for 3 s, followed by heating at 105 °C for 5-15 min. Quantitative determination by analysis of green channels of photographs using the CP Atlas 2.0 software. The hRf of theanine was 35. Linearity was in the range of 1.4-14 ng/zone. The intermediate/inter-day/intra-day precision was below 0.7 % (n=3). Recovery (by standard addition) was between 95.7 and 102.5 %.

Anal. Chem. 56, 1674-1677 (1984). Investigation of the possibilities of laser beam densitometry for thin-layer chromatograms. Picogram sensitivity appears obtainable with 15 mW power level (argon 488/514 nm or helium cadmium 442 nm laser).

GIT Suppl. Chromatogr. 3, 32-38 (1986); part II: GIT Fachz. Lab. 10, 993-998, (1986). Principle and applicability of TLC using mobile phase pressure of up to 80 bars. Circular development of single sample injected in-flow and of multi samples applied on the dry layer. Use of normal and reversed phase material, including multiple use of the same layer. Quantification of the chromatograms by direct image processing using optical sensitive RAM.

J. Chromatogr. 455, 382-390 (1988). Presentation of an indirect fluorimetric detection method for alkanols, bile acids and digoxin series for TLC on silica or chemically bonded silica with different solvent systems containing certain fluorophores, which generates uniform background fluorescence, and allowing detection of non-fluorescent spots with nanomolar detection limits. Discussion of the selection of visualization reagent and the effect of the chromatographic conditions.