Basic principles, instruments and developments. Hungarian Scientific Instruments 55, 33-39 (1983). OPTLC review with 27 references. Contents: introduction; development of the pressurized ultramicro chamber; operation of overpressured layer chromatography, eluent selection; practicable versions of the development in overpressured layer chromatography; subsequent publications.

(Czech). (Multichromatograph for thin-layer chromatography and a collector for large volume fractions). Two practical devices for chromatography are described: an apparatus for simultaneous flat-bed chromatography in 10 solvent systems and a glass fraction collector (distributor) for large volume fractions, operating on the hydraulic principle and therefore safe for work with inflammable solvents.

J. Planar Chromatogr. 6, 313-318 (1993). Practical hints for proper treatment of TLC preparations: Cutting of precoated plastic and aluminium sheets and glass plates, handling storage, pre-washing, activation, conditioning.

J. Chromatogr. A 1532, 198-207 (2018). Development of a method to analyze the efficiency of a diverse set of natural deep eutectic solvents (NADES) for the extraction of compounds of interest from two model plants, Ginkgo biloba and Panax ginseng. HPTLC on silica gel with toluene – ethyl acetate – acetone – methanol 50:25:25:3 for ginkgolides in Ginkgo biloba leaves; with ethyl acetate – acetic acid – formic acid – water 100:11:11:27 for phenolics in Ginkgo biloba leaves; with toluene – ethyl acetate – acetic acid 40:10:1 for ginkgolic acids in Ginkgo biloba leaves; with chloroform – ethyl acetate – methanol – water 15:40:22:10 for ginsenosides in Panax ginseng leaves and stems. The six different NADES were combinations of two or three compounds mixed in defined molar ratios, e.g. malic acid – choline chloride 1:1, malic acid – glucose 1:1, choline chloride – glucose 5:2, malic acid – proline 1:1, glucose – fructose – sucrose 1:1:1 and glycerol – proline – sucrose 9:4:1. Processing the data obtained by multivariate data analysis showed differences between the extracts. Discussion of the foreground of application of NADES in green chemistry and the advantages of NADES as green solvents used in novel green products for the food, cosmetics and pharmaceuticals.

Z. Lebensm. Unters. Forsch. 201, 327-330 (1995). Description of solid phase extraction technique for cleaning up polar eluates used for confirmation of results by HPTLC techniques. Chromatographic conditions as described in CBS abstract 76 128 and 76 129.

J. of Chromatogr. A 1257, 195-203 (2012). Based on the recent description of the fabrication of TLC plates from patterned carbon nanotube (CNT) forests via direct infiltration/coating of the CNTs by low pressure chemical vapor deposition of silicon from SiH4, followed by high temperature oxidation of the CNTs and Si, an improved microfabrication process for the preparation of these TLC plates has been presented. First, deposition of a few nanometers of carbon and/or a thin film of Al2O3 on the CNTs, confirmation of the presence of additional oxygen after carbon deposition by X-ray photoelectron spectroscopy, after priming, coating of the plates by rapid, conformal deposition of an inorganic material that does not require subsequent oxidation, i.e., by a fast pseudo atomic layer deposition (?-ALD) of SiO2 from trimethylaluminum and tris(tert-butoxy)silanol and faithful reproduction of the features in the masks is still observed after oxidation. Fast, highly efficient separations of the fluorescent dyes eosin Y disodium and sulforhodamine B were achieved on amino phase with LiCl - methanol 1:100 over 30 mm migration distance.

J. Planar Chromatogr. 29, 435-445 (2016). TLC of Pb2+, Cu2+, Cd2+, Ni2+, Co2+, and Sn4+ on 0.1 M thiourea-impregnated silica gel with 0.001 M HCl. Pb2+, Cu2+, Cd2+, and Sn4+ were detected with yellow ammonium sulfide solution, whereas Co2+ and Ni2+ were detected with 1 % ammoniacal dimethylglyoxime solution.

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