J. Liq. Chromatogr. Relat. Technol. 42, 613-628 (2019). Review of TLC methods for the analysis of cannabis, including extraction methodologies, TLC for the study of biological activity of cannabis, analysis of male and female Cannabis sativa varieties, TLC separation, detection and identification of cannabis. TLC-densitometric methods for the quantification of cannabinoids and TLC-bioassays were also described. The application of TLC for the detection of tetrahydrocannabinol and its metabolites in urine and hair and for the analysis of synthetic cannabinoids was also reviewed.

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. Planar Chromatogr. 32, 355-358 (2019). Review of changes of TLC usage between 2008 and 2018, regarding geography, journals publishing articles on the field, subject area of publications and main conditions under which the analyses were conducted.

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. 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.

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.