Anal. Sci. Vol. 13 Sup., 191-194 (1997). Study of the vertical concentration distribution of compounds on TLC plates by photoacoustic spectroscopy (PAS). Exhibition of irregular concentration profiles of the compounds in vertical direction under the given conditions, and tending to uppermost 61 mm thick layer. Discussion of the phenomenon in improving linearity of calibration curves compared to those obtained by reflectance densitometry.

J. Planar Chromatogr. 15, 204-209 (2002). Description of a new diode-array scanner in combination with a computer-controlled application system which meets all demands of modern HPTLC measurement, e.g. automatic application, simultaneous measurements at different wavelengths, and different linearization models enabling appropriate evaluation of all analytical questions. These aspects result in substantial improvement of in-situ quantitative densitometric analysis, and simultaneous recording at different wavelengths opens the way for chemometric evaluation, e. g. peak purity monitoring, which improves the accuracy and reliability of HPTLC analyses.

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.

J. Liquid Chrom. 5,1567-1572 (1982). Description of a new detector system for continuous-flow TLC providing possibilities both for optical and electrochemical measurements with low detection limits.

J. High Resol. Chromatogr. 6, 575-576 (1983). Two-dimensional TLC of saturated and cis-and trans-monounsaturated alcohols, fatty acids and fatty acid methylesters on silica impregnated with AgNO3, H7[P(W2O7)6] + Co(NO3)*6 H2O with 1.) toluene -hexane - isopropanol - acetic acid 30:30:1:0.3 for 2 cm, 2.) toluene - ethyl acetate - acetic acid 20:1:0.2 for 3.5 cm. Detection by heating at 220-250 °C. Densitometry.

I. Overpressured thin-layer chromatography. J. Chromatogr. 290, 127-1 34 (1984). Study of over-pressurized thin-layer chromatography in ion-pair systems. The most important aspect when a reversed-phase ion-pair TLC system is to be used is to apply a suitable procedure for pre-treatment of the sorbent. The sorbents were pre-treated by immersion in an ethanolic solution of ion-pair reagent, cetrimide being used as the ion-pairing agent and different carboxylic acids and phenols.