Encyclopedia of Chromatography Third Edition 1, 514-517 (2009). This review describes the three most important TLC-based drug screening methods for the analysis of the most counterfeited drugs, which are intended to treat tuberculosis infections, macrolides antibiotics, and drugs from the World Health Organization. The methods correspond to the Speedy TLC kit, Fast Chemical Identification System and MiniLab TLC system. The author also describes the advantages of drug-screening TLC methods and its application in the laboratory or in the field.

(Ion-pair TLC). Pharmazie 40, 299-304 (l985). Review on ionpair TLC with numerous proposals for developing conditions.

J. Chromatogr. A 1218 (19), 2732-2736 (2011). A review on the sustainability and robust advantages of TLC and the parameters which are critical to the successful performance of product quality assessments in resource limited areas including field applications. The training required for successful performance of HPTLC assessments is much lower than that of other technologies with comparable reproducibility such as HPLC, because of the robustness and ease of use for HPTLC. Presentation of some of the successful applications of planar chromatography in resource limited countries. In practice in finished pharmaceutical products there are generally few active ingredients which are assessed making the HPTLC adequate for these analyses.

Volumes 1-3, CBS Publishers & Distributors, New Delhi, India (2013). The first volume provides a comprehensive introduction to the HPTLC technique, including details for each HPTLC step as well as various factors which influence the performance of a HPTLC analysis. Then presented over 3 volumes, 528 protocols for the HPTLC analysis of pharmaceutical formulations follow. Each protocol provides details on the preparation of samples and standards, chromatographic equipment, parameters for densitometric evaluation, chromatographic conditions, including stationary phase, mobile phase, standard and sample application, chamber saturation, relative humidity, quantity of mobile phase, temperature, migration distance and other critical parameters. References to the original publication are given as well as comments on the validation or any comparative study. Each protocol is illustrated with a typical densitogram, structures of the compounds analysed and overlaid UV spectra of compounds analysed (for selection of suitable wavelength for densitrometric scanning). All in all a comprehensive collection of protocols for pharmaceutical formulations.

Trends Anal. Chem. 81, 51-62 (2016). Review on aspects to consider during calibration for quantitative chromatographic analysis such as noise and detector response, data acquisition and processing, calibration curve and inverse calibration.

Trends Anal. Chem. 87, 98-111 (2016). Chemical labeling of products (tagging) assists in the prevention and/or detection of counterfeiting. Mineral oils are protected against counterfeiting by spiking them with visible and/or invisible compounds. Due to the wide variety of available products and the different purposes for tagging there are many chemical substances used as taggants. To protect consumers and products it is important to establish the physico-chemical properties of these taggants. Review of techniques and methodologies for the analysis of liquid fuel taggants, including the application of TLC for the quantitative determination of SR24 taggant in heavy oil and for the detection of markers for petroliferous products, in particular diesel oil.

J. Liq. Chromatogr. Relat. Technol. 40, 165-176 (2017). Review of principles, materials, instrumentation, and procedures of modern preparative TLC and selected applications to various types of target compounds and sample types for the period 2007 to the end of 2016. The paper provided an update of the most recent reviews as well as book chapters on this topic.

J. Ethnopharmacol. 213, 230-255 (2018). Review of the botany, ethnopharmacology, phytochemistry, biological activities, nutritional value, possible molecular mechanisms, safety and clinical applications of Morinda officinalis with a special focus on its bioactivities, including the application of HPTLC for the analysis of oligosaccharides from different habitats.