J. Liq. Chromatogr. Relat. Technol. 38, 1279-1285 (2015). TLC of Citrus herbal medicines on NaOH-modified silica gel with ethyl acetate - methanol - water 100:17:13, followed by drying at room temperature and second development with toluene - ethyl acetate - formic acid - water 20:10:1:1. Detection by spraying with 1 % aluminium chloride ethanolic solution. The greyscale image captured under UV 365 nm was corrected by removing the quadratic baseline trend of the densitometric curve of every row.

Anal. Chem. 57, 1359-1 362 (1985). Study of the factors affecting signal/noise ratio and detectability of a photothermal deflection densitometer in TLC applications. The detectability of azobenzene, 1.3 ng. Suggestion of Hadamard transform photothermal deflection spectroscopy. Significant parameters are the angle between the TLC plate and the probe laser beam, probe beam offset from the plate, output power of laser pump beam, and chopper frequency.

European Chromatography News 2, 18-21 (1988). Description of some of the many recent innovations like advances in TLC plates, sample application, development techniques and instrumentation for detection, quantification and identification. TLC is described as a sensitive instrumentalized quantitative analytical technique.

Anal. Chem. 61, 2288-2292 (1989). Description of a new detection method for the determination of porphyrins present in biological materials. Separation of carboxylic acid porphyrins by HPTLC after esterification. Detection by using one of the visible lines of an argon-ion laser for fluorometric excitation. Demonstration of good selectivity and detectability for the determination of porphyrin profiles in human urine. Detection limits in the 18 - 35 pg ranges.

J. Planar Chromatogr. 3, 206-209 (1990). Presentation of the geometry and the optical mounting of a detector suitable for bidimensional column liquid and for bidimensional thin-layer chromatography. Continuous detection of the so called on-line OPLC is performed by using a photodiode array placed parallel to the slit and monitoring the absorption of UV light along it. An ultrafast data acquisition system which allows more than 100 readings of the 1024 pixels of the array per second is described. The software includes real-time data processing, signal enhancement, and data reduction together with on-line color video display features.

J. Planar Chromatogr. 7, 309-314 (1994). Introduction of a new version of the internal standard method for use in quantitative thin-layer chromatography. In comparison with the existing method, the proposed technique enables significant enhancement of the accuracy and precision of quantification. The reasons for this are considered. The technique described enables the calculation of the relative response factor of a sample component relative to an internal standard; within the calibration range the relative response factor is independent of the masses of the component and standard.

J. Chromatogr. A 768, 329-333 (1997). Comparison between scanning of the totally illuminated TLC plate using a CCD camera and slit-scanning densitometry in the quantification of saccharose in fermented and non-fermented soybean flour, in reflectance and in transmission mode. Investigation of the correlation between response area and the concentration of saccharose for both approaches. TLC on silica with acetonitrile - water - methanol 68:12:1. Visualization by dipping into 2% diphenylamine + 2% aniline in methanol - phosphoric acid 4:1 and heating at 120°C for 10 min.

Chromatographia 53 (Sup.), S-438 - S-441 (2001). Presentation of a new and sturdy HPTLC scanner which allows simultaneous registrations of spectra in a range from 198 nm to 612 nm with a spectral resolution of better than 0.8 nm, and on-plate spectral resolution of better than 160 µm. The new diode array scanner offers a fast survey over a TLC separation and makes various chemometric applications possible. Description of a cross-correlation function for identification of compounds by comparison of UV spectra with appropriate library data, which can also be used for purity testing.