Food Chem. 428, 136825 (2023). Review of phytochemical properties of Passiflora and methods for the identification of chemical compounds in different parts of the plant. The papers described TLC and HPTLC methods for the analysis of components such as p-hydroxibenzoic acid, syringic acid, apigenin.

J. Liq. Chromatogr. Relat. Technol. 45, 130-142 (2022). Review of the application of analytical quality by design (AQbD) and design of experiments (DoE) for the determination of medicinal products, including TLC for the identification of critical analytical attributes and critical method parameters. The paper also described a diagram for risk assessment in HPTLC methods, including risk priority number, as a threshold score for an attribute.

J. Liq. Chromatogr. Relat. Technol. 45, 165-173 (2022). Review of different methods for the extraction and characterization of glycolipids, including chromatographic methods, such as TLC for the analysis of microbial glycolipids, marine source glycolipids, plant glycolipids and animal glycolipids.

J. Planar Chromatogr. 35, 549-570 (2022). Review of the analytical application of deep eutectic solvents (DESs) in different chromatographic technologies, including TLC. The paper included a comprehensive list of applications of DESs as mobile phase/mobile phase modifiers, for the analysis of alkaloids and flavonoids.

Chinese Medicine 15, 76 (2020). This review compared the 2020 editions of Chinese (ChP) and European Pharmacopoeas (EuP) in different aspects of quality control of traditional Chinese medicinal plants (73 of which drugs were common to both, but with differences in species or organs for 17 of them). Discussed points included history, identification, plant origin and processing, sample preparation, marker selection, tests and assays, as well as advanced analytical techniques for quality control and for the establishment of comprehensive quality standard. TLC was discussed in relation to its following aspects: purposes, markers/references, techniques and result description.
(A) The main uses of TLC and HPTLC were (1) chemical-based identification of the plant in a more accurate and precise method than by macroscopic and microscopic observation only, and in a more direct and easily interpretation than HPLC, and allowing the simultaneous analysis of multiple samples in parallel; (2) control of possible adulterants; (3) quantification of active compounds. Both uses (1) and (2) were combined in some EuP monographs: as example were given the roots of Angelica dahurica, A. pubescens, A. sinensis, using TLC for identification of the species and of adulterants from other species (Angelica, Levisticum and Ligusticum).
(B) In ChP, identification through TLC was in most cases achieved by fingerprint comparison to an official reference extract or herb (herbal reference substance). At the opposite, EuP often indicated analytical markers, irrespective of any pharmacological activity, but chosen only for analytical purposes in TCM identification and quantification. Examples were: aescin and arbutin as analytical markers for TLC identification of Anemarrhena asphodeloides rhizome and Panax notoginseng root.
For the TLC system suitability assessment tests, ChP used the same intensity markers or active markers that were chosen for the identification or assay; whereas EuP often used other specific references, e.g. isoeugenol and methyleugenol in the case of Ophiopogon japonicus roots.
(C) For the techniques, conventional separations and chemical derivatizations were used. Hyphenations of TLC to other analytical methods (e.g. MS) were absent. Only one monograph applied an effect-directed analysis directly on TLC chromatogram (free DPPH• radical scavenging assay for TLC identification of Rehmannia glutinosa root, in ChP).
Sometimes, the TLC methods were different between both reference books for the same species. Example was given for Belamcanda chinensis (=Iris domestica) rhizome: in EuP, development on silica gel with cyclohexane – ethyl acetate – acetic acid 20:80:1, detection under UV 254 nm, comparison to standards coumarin and irisflorentin; whereas in ChP, development on polyamide layer with chloroform – butanone – methanol (3:1:1), detection under UV 365nm after derivatization with aluminium chloride, comparison to a reference rhizome powder.
 (D) Finally, the results in ChP were described as a text stating the similarity of sample profile with the profile of the chosen reference, whereas the results in EuP were described with a schematic box indicating the positions of bands of interest.

J. Ethnopharmacol. 305, 116004 (2023). Review of the ethnobotany, phytochemistry, and biological activities of the medicinally important Prunus africana. The paper described various TLC and HPTLC methods to isolate and analyse P. africana extracts, including the identification of myristic acid, palmitic acid, linoleic acid, oleic acid, stearic acid, arachidonic acid, n-docosonal, behenic acid, lignoceric acid, β-sitosterol, and ursolic acid.

Phytochem. Anal. 34, 5-29 (2023). Review of the plant resources, chemical ingredients, and biological activities of Euodiae fructus, focusing on the chromatographic and mass spectrometric technologies used for analysis of Euodiae fructus. The paper described TLC and HPTLC methods for the analysis of different analytes such as rutaecarpine and evodiamine and their application in traditional chinese medicine research. 

Trends Anal. Chem. 144, 116450 (2021). Review of analytical techniques for the forensic examination of photocopied documents. The papers described the application of chromatographic techniques, including TLC and HPTLC for the analysis of lifting toner samples from different brands.