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.

Thieme Medical Publishers Inc., New York (2006). This book presents the theoretical and technical information needed to perform reliable and reproducible high-performance thin-layer chromatography (HPTLC) to establish the identity, purity, quality, and stability of raw materials, extracts, and finished botanical products. The text provides a complete overview of the techniques and common applications of HPTLC in herbal analysis. Chapters covered are theoretical concepts (stationary phase, mobile phase, TLC results, densitometry), practical aspects of modern TLC (sample preparation, selecting the stationary phase, sample application, chromatogram development, derivatization, documentation, reporting and record keeping, TLC software, standardization), typical applications in herbal analysis, method development, and validation of qualitative and quantitative HPTLC methods.

(Thin-layer chromatography in pharmacies.) Wissenschaftliche Verlagsges. mbH, Stuttgart, ISBN 3-8047-1387-4 (1995). TLC procedures for 171 pharmaceuticals, drugs and preparations including coloured chromatograms; 450 pages, DIN-A-4-size, serial edition.

Phytochem. Anal. 19, 2-16 (2008). Recent developments in the phytochemical analysis of Panax ginseng are described, including different approaches such as the determination of the total saponin content and target compound and group-specific analysis using HPTLC-MS. In metabolite profiling, the paper describes the use of nuclear magnetic resonance spectroscopy and high-resolution mass spectrometry.

CBS Publishers & Distributors, New Delhi, India, (1996), 459 pages, ISBN 81-239-0439-8.1. The book consists of an introductory section of 74 pages about general TLC techniques with 30 figures and 54 literature references; the practical part with 197 protocols of the analysis of pharmaceutical formulations give analytical parameters such as sample and standard preparation, chromatographic conditions, densitometric parameters, etc. See detailed review on page 51 CBS 76.