Trends Anal. Chem. 101, 85-107 (2018). Review of the different nomenclature, impurity testing policies, and the manner in which impurity tests and lists are provided in the monographs for the drug substances and_x000D_ drug products. The review included typical examples of multiple tests in pharmacopoeial monographs for impurities, including TLC methods. A list of private vendors supplying reference standards of impurities and degradation products for TLC was also included.

Food Chem. 255, 120-131 (2018). HPTLC of polyphenols (chlorogenic acid and rutin) in the peel, pulp, and the edible part of pepper on silica gel with ethyl acetate – dichloromethane – formic acid – acetic acid – water 100:25:10:10:11. Detection by spraying with Natural Product reagent and anisaldehyde sulfuric acid solution. Qualitative identification under UV 254 and 366 nm.

Trends Anal. Chem. 102, 225-235 (2018). The study described reliable effect-based methods for screening of endocrine disrupting compounds to fulfill the requirements of the European Decision EU 2015/495 regarding steroidal estrogens of the Water Framework Directive. The study identified TLC-based methods such as the planar Yeast Estrogen Screen (pYES) for the quantification of the overall estrogenic activity present in the sample by means of 17ß-estradiol-equivalence concentrations.

J. Chromatogr. A 1560, 78-81 (2018). The minimalistic software quanTLC is open-source, online, intuitive to use and tailored to planar chromatography. It supports common image file formats for chromatogram upload and allows the quantitative evaluation of samples quickly, involving steps of videodensitogram extraction, preprocessing, automatic peak integration, calibration, statistical data analysis, reporting and data export. The default options for each step are suitable for most analyses, but can be tuned for export of the data in each step and for further processing in other software. Demonstration of the software capabilities on the example of a lipophilic dye mixture separation in a one-minute video user manual. Verification of the quantitative results by comparison with those obtained by commercial videodensitometry software and opto-mechanical slit-scanning densitometry. The software is directly accessible and online useable without installation.

Trends Anal. Chem. 108, 13-22 (2018). Review of the potential of 3D printing for the manufacturing of millifluidic platforms for analytical chemistry. Key features of 3D printed devices incorporating chromatographic/electrophoretic separation was summarized, including photopolymer inkjet printing in a planar chromatography format for the separation of visible dyes and fluorescently tagged proteins.

Phytochem. Anal. 30, 218-225 (2019). HPTLC of flavonoids in red wine, apple juice and rose flowers on silica gel with ethyl acetate – methanol – formic acid 90:10:1. Glycosylated flavonoids were identified by inorganic matrix‐assisted laser desorption ionisation time‐of‐flight mass spectrometry (MALDI‐TOF‐MS).

and their herbal formulations. J. Planar Chromatogr. 31, 451-459 (2018). HPTLC of berberine chloride (1) and galangin (2) in Tinospora cordifolia M._x000D_ and Alpinia galanga on silica gel with toluene ‒ ethyl acetate ‒ formic acid 3:6:1. Quantitative determination by absorbance measurement at 267 nm. The hRF values for (1) and (2) were 17 and 82. Linearity was between 200 and 1200 ng/zone. LOD and LOQ were 28 and 86 ng/zone for (1) and 2 and 5 ng/zone for (2), respectively. The intermediate precision was <2 % (n=3). Recovery was between 97.5 and 102.6 % for (1) and (2).

J. Planar Chromatogr. 31, 383-388 (2018). HPTLC of cocaine hydrochloride (1) and levamisole hydrochloride (2) on silica gel with cyclohexane – toluene – diphenylamine 75:15:10. Quantitative determination by absorbance measurement at 230 nm. The hRF values for (1) and (2) were 24 and 48, respectively. Linearity was between 200 and 2400 ng/zone for (1) and 100 and 1200 ng/zone for (2). LOD and LOQ were 14 and 42 ng/zone for (1) and 6 and 19 ng/zone for (2), respectively. The intermediate precision was <2 % (n=6). Average recovery was 99.8 % for (1) and 99.9 % for (2).