J. Liq. Chromatogr. Relat. Technol. 43, 319-327 (2020). Review of impregnated agents used in TLC and their applications in analytical and medicinal chemistry. Impregnation with inorganic ions, chelating reagents, lipophilic substances, surfactants, chiral selectors and ionic liquids were discussed.

J. Liq. Chromatogr. Relat. Technol. 43, 305-318 (2020). Review of the application of TLC in the evaluation of different biological activities of natural compounds, focusing on antioxidant (using 2,2-diphenyl-1-picrylhydrazyl radical assay and decoloration of beta-carotene), enzymatic (using enzyme inhibition assays), antimicrobial (bioautographic assays) and hormonal (using yeast strains screening) activities.

Encyclopedia of Analytical Science 10, 93-99 (2019). Review of different aspects of the TLC plate-making process including sorbents used in TLC (silica gel, aluminum oxide, cellulose, polyamide, bonded silica layers, ion exchange and diatomaceous earth), thickness of layers, binders (calcium sulfate and polymeric binders), fluorescent indicators and other additives, supports, sorbent particle size and ultra thin-layer chromatography.

Trends Anal. Chem. 113, 54-73 (2019). Review of analytical methods for determination of lipophilicity, including a comparison of their usefulness, main advantages and limitations. TLC-based methods were also described, including RP-TLC for the analysis of compounds with low water solubility.

J. Food Compos. Anal. 80, 16-32 (2019). Review of methods and techniques for the analysis of adulterants in honey, including TLC and HPTLC. Originally TLC was used to detect honey adulterated with high fructose corn syrup. HPTLC has been used for the detection of sucrose, fructose or glucose in commercial honeys.
 

J. Liq. Chromatogr. Relat. Technol. 42, 249-257 (2019). Review of HPTLC methods published after 2000 for the analysis of vegetables, including bioactive compounds such as indoles, glycolipids, carotenoids and anthocyanins. TLC methods for the identification and quantification of pesticide residues such as iprodione, vinclozolin, cymoxanil, deltamethrin and parathion were reviewed. TLC coupled with other non-chromatographic techniques for the analysis of inorganic species, mycotoxins, glycoalkaloids and polyamides was described.  

Encyclopedia of Chromatography Third Edition 1, 2111-2115 (2009). The author describes the sample preparation methods prior qualitative and quantitative analysis by TLC and HPTLC. Classical extraction and clean-up methods include liquid-liquid extraction and soxhlet extraction. Modern methods such as solid phase extraction (SPE), pressurized liquid extraction (PLE), supercritical fluid extraction (SFE) and immunoaffinity (IA) extraction and clean-up are also described.

Müszaki Könyvkiadó, Budapest (1987), 399 pages. Contains 150-page review of TLC methods classified into 17 groups of compounds and a survey of reagents.