J. Planar Chromatogr. 33, 99-100 (2020). Review of the papers presented during the Eastern Analytical Symposium (EAS) meeting, held November 17-19, 2019 in Princeton, NJ, USA and organized by The International HPTLC Association. The five papers outlined 1) the use of HPTLC to analyze a complex sample via solvent combinations and the future development of an autorobotic system, 2) analysis of complex samples covering wide ranges of polarity (biofuels, petroleum, lipidomic analysis), 3) HPTLC use in combination with different techniques for environmental analysis, 4) progress in getting official organizations to include HPTLC methods for botanicals in their publications, 5) HPTLC in quality control of botanical supplements, 6) non-botanical applications dietary supplements analysis, 7) HPTLC identification and quantification of cannabinoids in cannabis samples, 8) challenges of validation and transfer of HPTLC methods across multiple laboratories, 9) HPTLC screening for undeclared ingredients and 10) ongoing programs of The International HPTLC Association.

J. Liq. Chromatogr. Relat. Technol. 41, 1052-1065 (2019). Review of the following topics for the period of November 1, 2016 to November 1, 2018: sample preparation for TLC pesticide analysis; lipophilicity and retention studies for the study of biological activity; new reagents for pesticide detection; HPTLC-effect directed analysis on the surface of the layer; TLC-Raman spectrometry for the analysis of thiabendazole, triazophos, and phosmet residues; TLC analysis of radiolabeled pesticides; methods for the separation, detection, and qualitative and quantitative determination of pesticide residues; determination of pesticides in commercial products and the use of TLC for pesticide degradation studies. The review highlighted the isolation, characterization, and determination of less hazardous and less toxic biopesticides from plants, bacteria, fungi, and soil as the most active application area of pesticide TLC today.

J. Liq. Chromatogr. Relat. Technol. 42, 122-127 (2019). Review of the application of TLC and HPTLC for the analysis of Licorice, the dried root and rhizome of Glycyrrhiza uralensis Fisch., Glycyrrhiza inflate Bat., or Glycyrrhiza glabra L. The authors described methods using HPLC combined with HPLC fingerprint for rapid identification of species as well as methodologies for the analysis of glabridin on silica gel and RP-18.

J. Liq. Chromatogr. Relat. Technol. 42, 238-248 (2019). Review of recent applications of TLC in medicinal chemistry, including the determination of lipophilicity of biologically active compounds and its influence as activity descriptors of absorption, distribution, metabolism, elimination and toxicity. Practical applications of TLC as a fast screening technique in different stages of monitoring processes were also described, including systems recently used for stability studies of selected drugs.

John Wiley and Sons, New York, N.Y. (1985). Proceedings of the "Third Biennial Symposium on TLC", Parsippany, N.J. 1982 (:). Contributions ranging from the description of new, home-made apparatus to routine applications of TLC. 395 pp

Marcel Dekker, Inc. (Chromatographic Sciences Series Volume 81) 499 p, $ 195 (1999). Fourth edition, divided into Part I - General Practices of TLC (13 chapters), and Part II - Application of TLC to different compound types (10 chapters). Update to previous editions.

Contributions of 23 authors.

The Royal Society of Chemistry, Cambridge 2005, ISBN 0-85404-535-X This book covers basic theory, concepts and practice of modern thin-layer chromatography. The author summarizes current knowledge obtained by many researchers working on qualitative and quantitative planar chromatography. The manual consists of eight chapters describing each step of typical planar chromatographic process with separate sections devoted to key analytical problems like stationary phase choice and pretreatment, mobile phase optimization, sample preparation and application, plate development and finally spot visualization, detection and quantification. The compact form of this work makes it a really simple, helpful and comprehensive introduction to modern thin-layer chromatography.