J. Planar Chromatogr. 2, 65-70 (1989). For qualitative analysis monodansyl cadaverine (MDC) was employed without further purification. Column-chromatographic purification is recommended for the quantification of short chain carboxylic acids. For in situ derivatization the carboxylic acid sample solutions were applied to the HPTLC plates as bands with a maximum length of 10 mm. These were then „overlayed“ with MDC solution containing N,N’-dicyclohexylcarbodiimide to activate the acids. Short-chain carboxylic acids were separated on normal silicagel phases with toluene - ethyl acetate - ammonia mixtures as mobile phase. Stepwise and gradient developments allow the baseline separation. Long-chain carboxylic acids are better separated on RP-18 phases with acetonitrile-tetrahydrofuran mixtures and methanol as mobile phase.

J. Planar Chromatogr. 4, 325-326 (1991). TLC of carboxylic acids (no details) on silica impregnated with different concentrations of paraffin oil in petrol ether with acetic acid - acetonitrile 50:1. Detection after drying at 100-120 °C for 30 min. by spraying with a 0.1% dichloromethane or benzene solution of the 2-methyl-, 2-methoxy-, 2-chloro-, 2-bromo-, or 2-fluoro-derivatives of 9-isothiocyanatoacridine (most efficient: 2- methoxy- and 2-chloro-compounds.

J. Chem. Educ. 73, A4-A6 (1996). Presentation of dip reagents useful for visualization in TLC.

J. Planar Chromatogr. 14, 8-15 (2001). TLC of fatty acid esters on silica gel resp. silica gel/kieselguhr with hexane - acetone 49:1 and on aluminium oxide with hexane - acetone 100:1. 18 new agents have been used for visualizing 8 esters of higher fatty acids. Limits of detection (detectability, D), detectability index, and broadening index were determined for the esters after use of the visualizing agents. Bromophenol blue was the best and most universal detection agent.

J. Planar Chromatogr. 28, 466-471 (2015). TLC of L-glutamic acid in a solution of Astragalus complanatus coarse powder on silica gel with n-butyl alcohol - glacial acetic acid - water 4:1:1. Detection by spraying with 0.2 % ninhydrin - acetone solution 10:1, followed by heating at 105 °C. Quantitative determination by measuring pixels after photographing. Linearity was in the range of 10-60 μg/zone. Average recovery was 103 %. Different measures to reduce the error were proposed.

Am. Laboratory 16, 65-73 (1984). Review on two-dimensional TLC; the increased data output requires a new technology for in situ detection and quantification. Seven techniques surveyed.

Anal. Chem. 60, 847-852 (1988). Presentation of a method for background correction of fluorescence detection in TLC, based on the assumption that variable background signals can be modeled by the abstraction spectra obtained from factor analysis of several background spectra and the appropriate weighting factors can then be calculated by using the adaptive Kalman filter. Discussion of the best models.

J. Planar Chromatogr. 2, 362-367 (1989). Evaluation of an experimental apparatus using a cooled, slow-scan CCD camera as a detector for the quantitative spectrometric analysis of planar separations. This technology is capable of providing two-dimensional separation mapping for component detection and XY-coordinate identification; quantification either by UV/visible absorption or fluorescence.