J. Chromatogr. A 750, 403-407 (1996). TLC of organophosphorus insecticides, carbamates and pentachlorophenol, etc. on silica with tetrahydrofuran - hexane 7:25, and hexane - ethyl acetate 3:2. Detection by using biological or biochemical tests. Investigation of the relationship between the signal of the inhibition of cholinesterase and the concentration of the inhibitor using a constant enzyme concentration and a constant incubation time. Quantification by densitometry or videodensitometry.

Anal. Chim. Acta 488, 203-209 (2003). Dansylation of aromatic carboxyl compounds (i.e. aspirin), aromatic primary amines, and aliphatic carboxyl compounds in 1 M Na2CO3 buffer at pH 11. TLC on silica gel of fluorescent labeled analytes using methylene chloride, ethyl acetate, acetone, or desired mixture of the solvents. Methylene chloride was superior to ethyl acetate or acetone. Fluorescent analytes were observed under UV lamp. Limits of detection for dansylated carboxyl compounds was 1-5 µg.

Acta Chromatographica 22 (2), 227-236 (2010), DOI:10.1556/AChrom.22.2010.2.6. TLC of piperine, the bioactive constituent of black pepper (Piper nigrum), on silica gel with dichloromethane – ethyl acetate 9:1 at 30 °C in a twin-trough chamber saturated for 30 min. Detection under UV light at 254 nm and documentation with a digital camera. Based on the image a density profile plot was established by Scion Image software, which allowed to calculate the concentration of piperine by comparison of the peak areas of samples and piperine standards. The linearity was in the range of 24-84 ng/zone (r2=0.9927). The limits of detection and quantitation were 0.35 and 1.05 ng/zone, respectively. Precision (repeatability, n=6) and intermediate precision (2 days, n=12) both are below 2.6 %RSD. Recovery is between 96.7-101.4 %.

Japanese Anal. Chem.(BUNSEKI KAGAKU) 33, 320-324 (1984). (Japanese). Description of new photoacoustic scanning densitometer. Scanning with chopped light (128 Hz) in X and Y directions with quartz fiber optic over the quartz cell window (5 x1 0 cm). Detection of signal by a condenser microphone, position of zone by two potentiometers. A linear correlation between signal and amount of sample (methylene blue) was obtained from 4-20 mg. 8.0 mg gave 1.86 mV with S/N 5.23 on a layer (silica?) backed by aluminium foil, and 4.08 mV with S/N 11.7 on a silica glass plate.

Anal. Chem. 59, 1446-1452 (1987). Description of photothermal deflection measurements of compounds on TLC plates. Spatially encoded expanded Ar+ laser beam operated at 488 nm. Use of a series of Hadamard masks for encoding the laser beam. Study of the dynamic range of the system and the resolution capability of the imager. Investigation of parameters.

J. Planar Chromatogr. 1, 76-78 (1988). Imaging analysis of neostigmine and pyridostigmine bromides by SIMS after TLC separation. Measurement of the ratio of ion intensities for the signal of the intact cation of sample and that of deuteriumlabeled analog at a mass 3 daltons higher.

Anal. Chem. 62, 374-378 (1990). TLC of PAHs on silica with hexane. Mount of the TLC sheet on a sliding sheet roller attached to a supersonic jet nozzle. Introduction of the 1st dye laser beam (275nm) from a small through-hole to desorb the chemical species on the sheet. The vaporized sample is entrained into a carrier gas of argon, and the gas is then expanded into a vacuum to form a supersonic jet. Detection of the sample molecules by fluorescence induced by the 2nd dye laser beam (366-375 nm) direct measurement of excitation spectrum and chromatogram for the sample spot. Detection limit 10 ng.

J. Chromatogr. 596, 241-249 (1992). Discussion of specific features of densitometric equipment and application of modern image processing to the densitometric analysis of two-dimensional flat-bed separations with emphasis of electrophoresis. Also, discussion of the software aspects of the experimental system.