(Dünnschichtchromatographie mittels Dioden-Array Detektion). GIT Spezial Separation I/2001, 37-39 (2001). Development of a HPTLC scanner for the measurement of spectra between 198 and 612 nm using a diode array detector. Quantitative HPTLC of caffeine on silica gel with isopropanol - cyclohexane - 25% NH3 7:2:1 and of uric acid, cytosine, guanine, caffeine, adenine, uracil and thymine on silica gel with isopropanol - toluene - 25% NH3 6:3:1. Measurement of 450 single spectra between 200 and 400 nm within 225 s.

J. Liq. Chromatogr. Relat. Technol. 31, 161-168 (2008). TLC of 37 compounds, i. a. nitrotoluene, on silica gel, aluminium oxide, cellulose, and silanized silica gel after a short (few centimeters) elution with different eluents. After precise positioning, attenuated total reflectance (ATR) is used for measuring the spots against air background in the range of 650-4000/cm. Diffuse reflectance (DRIFT) and ATR are infrared sampling methods, based on the detection of infrared radiation reflected by the sample. They are widely used in surface analysis and are both capable of detecting small amounts of organic compounds. DRIFT is a well known on-layer method for the identification of analytes, separated on thin layers. In the present work, the possibility of using a diamond ATR unit to collect IR spectra of sample spots is examined.

J. Planar Chromatogr. 7, 117-121 (1994). HPTLC and TLC of amino acids, sugars, cardiotonic heterosides on silica with common eluents. Derivatization by pressing a pad of polymeric foam containing the reactive solution on to the chromatographic plate in order to obtain homogeneous and complete distribution of the reagent over the whole plate. Comparison with spraying and dipping.

J. Planar Chromatogr. 16, 23-27 (2003). TLC of a zinc complex stock solution (Zn(CH3CH2COO)2(tu)2 - a complex of zinc butyrate bound to two thiourea molecules) on RP-18, aluminium backed, with methanol - water 2:3. The first interface was formed by vacuum deposition of silver on to the chromatographic layer and onto a channel formed by scraping the layer from the glass plate. The unmodified aluminium backing of a TLC plate (again formed by elution) was used as the second interface. Silver vapor-coated aluminium gave better results.

Anal. Methods 4, 2522-2527 (2012). HPTLC of the petroleum ether extracts of the herbal TCM root drugs of Aster tataricus, Atractylodes lancea, Gentiana rigescens, and Gentiana macrophylla on silica gel with toluene - ethyl acetate 15:1 over 70 mm. Detection under UV 366 nm and white light after immersion in 1 % vanillin solution dissolved in 10 % conc. sulfuric acid in ethanol, heating at 105 °C for 5 min. Each sample track on the UV 366 nm image was digitalized. For statistical data exploration multivariate analysis based on the models principal component analysis (PCA), partial least-square-discriminant analysis (PLS-DA) and orthogonal PLS-DA was used. The model score plots showed for all three models good spatial distributions with clear cluster for grouping each sample and high reproducibility and predictive values (> 0.5).

J. Chromatogr. 684, 370-373 (1994). Description of a micro-preparative TLC system. Quantitative elution of the separated spots or linear zones with a fast-moving drill, and by siphoning eluent through a specially formed sintered glass onto one end of the zone or spot and picking up the eluate at the other with a piece of filter-paper carton. Extraction of the latter by soaking and centrifugation. Demonstration of the application in the carbohydrate field.

J. Planar Chromatogr. 17, 398-403 (2004). Review divided into several sections: ,Summaries’ contains a review of some recent research results in TLC-MS and PC-MS (use of a diode IR laser to desorb samples from a thin-layer chromatogram, with ionization of the desorbed gaseous molecules via a corona discharge; description of an interface between TLC and an electrospray ionization (ESI) mass spectrometer; ,on spot’ matrix-assisted laser desorption ionization (MALDI) mass spectrometry for TLC-MS); in ,Assessments and perspectives’ new results are detailed, precedent and new instrumental developments are previewed; in the section ,Interconnections’ synergies between mass spectrometry and different approaches to planar separations are explored. Finally, in ,Forecasts’ expectations and future developments, in addition to recent techniques, are described. 11 references.

J. Liq. Chromatogr. Relat. Technol. 40, 320-326 (2017). HPTLC of 31 substances of toxicological interest on RP-18 with 60 % acetonitrile in buffer pH 6.0, on silica gel with chloroform – methanol 9:1 and using pressurized planar electrochromatography (PPEC) on RP-18 with 60 % acetonitrile in buffer pH 2.2. The authors showed the application of the migration distance of the solutes, obtained by the PPEC technique, with a proposed equation allowed for increase of likely identification of substances in toxicological analysis.