J. Liq. Chromatogr. Relat. Technol. 30, 2021-2036 (2007). TLC of carotenoid colorings of 95 commercial foods (33 for tomato color [lycopene], 38 for orange color [e.g. fatty acid ester of beta-cryptoxanthin], and 24 for marigold colorings [fatty acid ester of lutein]) on RP-18 with acetonitrile - acetone - n-hexane 11:7:2 and acetone - water 9:1. TLC of beta-carotene and paprika colorings of 77 commercial foods (e.g. capsanthin and its esters) on RP-18 with n-hexane - acetone - acetonitrile 2:7:1. TLC of quinone colorings (lac and cochineal colors) on RP-18 with methanol - 0.5 mol/L oxalic acid 11:9. TLC of anthocyanin colorings of 45 commercial foods (red cabbage color [derivatives of cyanidin acylglycoside]) on RP-18 with acetonitrile - 0.2 mol/L trifluoroacetic acid 1:2. Identification by recording of visible absorption spectra.

Encyclopedia of Chromatography Third Edition 1, 1640-1647 (2009). This review describes densitometry as the most widely used quantitative TLC method. The principles and theory of densitometry, as well as the instrumental design and data handling are also described. It also mentions in detail the applications and practical aspects of densitometry and finally describes the advantages of TLC/densitometry compared to HPLC.

Advances in Chromatography 49, 401-429 (2011). Review on TLC and HPTLC for qualitative and quantitative determination of lipids, amino acids, carbohydrates, drugs, steroids, gangliosides, glycosides, pigments, phenols, bile acids, and oligosaccharides in human and animal samples matrices. This chapter is an update of a review article by the same authors on TLC in biological analysis that covered the literature through 2004. The sections describe the steps of biological sample analysis by TLC and HPTLC.

Phytochem. Anal. 24, 1-24 (2013) The application of chemometrics in combination with chromatographic fingerprining was reviewed. The authors described how this combination allowed to find correlation between different variables such as molecular profile and genetic variability and their geographical origins and growing conditions.

J. Chinese Trad. Patent Med. 36 (3), 589-592 (2014). TLC has many advantages: one-time use of stationary phase so often no sample clean-up is needed, wide selection range of the stationary and mobile phase, all separated compounds are stored on the plate for further analysis or detection, etc. Therefore, TLC has been widely applied to various fields, particularly, the quality control of TCM, which is complex. The modernization of TCM mainly relies on modern separation technology. However, the peak capacity of conventional TLC is limited and a more advanced technology, two-dimensional TLC (2D-TLC) emerged. This summary presents a review on 2D-TLC with 26 references, including classification (e.g. 2D-TLC on single absorbent, 2D-TLC on twin absorbent, and 2D-graft TLC), image processing technology of chromatograms using specialized software for further qualitative and quantitative analysis, in-situ hyphenated technology of 2D-TLC with desorption electrospray ionization mass spectrometry (DESI-MS) etc.

Phytochemistry. 117, 554-568 (2015). Review of the bioactive markers for quality control of products containing gingerols and shogaols from the rhizomes of ginger (Zingiber officinale). HPTLC of gingerol in ginger rhizomes and Ayurvedic products on silica gel with n-hexane - diethyl ether 2:3 (1) or n-hexane - acetone 18:7 (2). The hRF value of gingerol was 40 with (1) and 23 with (2).

J. Chromatogr. Sci. 53 (3), 436-442 (2015). Review on the most important aspects of forced-flow TLC, including the set-ups developed and the progress of detection methods used. Description of mobile phase progress in planar stationary phase, evoked by either internal forces, capillarity, or external forces, e.g., gravity, electric field, a pump and centrifugal forces. Emphasizing on overpressured layer chromatography and forced-flow planar chromatography, as a special bridge between HPLC and TLC. Characterization of a simple and special rule of the progress of mobile phase: optimal efficiency is composed by the doubled effect of flow resulting from the pump-forced mobile phase (convex profile of laminar flow) and capillary forces on the dry stationary phase (concave laminar flow).

Food Control. 72, 110-122 (2017). Review of the methodologies reported on mycotoxin analysis in Sub-Saharan Africa. The review highlights the analytical methods reported for monitoring of toxic contaminants in food and feedstuffs, including references on the application of TLC and quantitative densitometry. _x000D_