J. Planar Chromatogr. 29, 203-208 (2016). HPTLC of bacoside A in Bacopa monnieri on silica gel with ethyl acetate – methanol – water – butanol 160:25:16:5. Detection by spraying with anisaldehyde – sulfuric acid reagent followed by heating at 105 °C for 5 min. Quantitative determination by absorption measurement at 525 nm. Linearity was in the range of 160-480 ng/zone. Intermediate precisions were below 1.3 %. The LOD and LOQ were 40 and 120 ng/zone. The method was performed to check the chemical diversity in Bacopa in relation to bacoside A.

J. Planar Chromatogr. 29, 221-226 (2016). HPTLC of malathion (1) and fenthion (2) in apple and orange juice on silica gel with n-hexane – acetone 3:2. Detection by spraying with 6 % sodium azide, 0.25 % starch, pH 6.5 for (1) and 0.5 % sodium azide, 2 % starch,_x000D_ pH 6.0 for (2), followed by exposure to iodine vapors for 15 s. The chromatograms were scanned at 300 dpi. The hRF values for (1) and (2) were 51 and 48, respectively. Linearity was in the range of 1.0-7.3 μg/zone for (1) and 2.5-24.8 μg/zone for (2). Intermediate precisions were below 3.1 %. The LOD and LOQ were 242 and 807 ng/zone for (1) and 588 and 1960 ng/zone for (2), respectively. Recovery was in the range of 94.8-105.4 % for (1) and 84.2-104.0 % for (2).

Food Control. 72, 145-152 (2017). The paper discussed five important adulteration events that occured in Taiwan between 2011 and 2015, including a review of analytical methods developed by the Taiwnan Food and Drug Administration to investigate these incidents, including HPTLC methods for the detection of copper chlorophyll, Cu-pyropheophytin A, from slurry green dyes obtained from edible oils. _x000D_
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J. Planar Chromatogr. 29, 330-335 (2016). HPTLC of wedelactone in Eclipta alba, Wedelia calendulacea and Wedelia trilobata on silica gel with toluene – chloroform – ethanol – formic acid 10:8:2:1. Quantitative determination by absorbance measurement at 351 nm. The hRF value for wedelactone was 29. Linearity was between 80 and 280 ng/zone. The intermediate precision was below 2.5 % (n=3). The LOD and LOQ was 0.36 and 1.09 ng/zone, respectively. Recoveries were between 99.4 and 100.3 %.

Food Control. 68, 220-228 (2016). HPTLC of biogenic amines (putrescine, histamine, tyramine and agmatine) in microbial cultures on silica gel with chloroform – benzene – triethylamine 12:9:2. Quantitative determination by absorbance measurement at 254 nm.

J. Planar Chromatogr. 29, 372-379 (2016). HPTLC of vitamin E (1) and vinpocetine (2) in its alkaline-induced degradation product (3) on silica gel with methanol – chloroform – ethyl acetate – glacial acetic acid – ammonia 60:20:20:5:1. Quantitative determination by absorbance measurement at 235 nm. The hRF values for (1) to (3) were 81, 62 and 41, respectively. Linearities were between 0.2-2 µg/zone for (1), 0.1-1.5 µg/zone for (2) and 0.1-1 µg/zone for (3). The intermediate precisions were below 0.7 % (n=3). The LODs and LOQs were 67 and 198 ng/zone for (1), 32 and 98 ng/zone for (2) and 29 and 87 ng/zone for (3). Average recoveries were 99.6 % for (1), 100.0 % for (2) and 99.9 % for (3). The results were statistically compared with those obtained by a HPLC method and no significant differences were found.

J. Liq. Chromatogr. Relat. Technol. 40, 259-281 (2017). Research communication on chromatographic properties of 18 colorants including amaranth, black PN, bromophenol blue, bromocresol green, bromocresol purple, bromothymol blue, carmine, dimethyl yellow, erythrosine, fluorescein, methyl red, naphthalene black, patent blue, phenol red, Sudan II, Sudan III, Sudan IV, and p-xylenol blue. The paper presents a comprehensive retention database for designing 1D and 2D planar separations systems.

Planta Medica 83(03/04), 239-244 (2017). HPTLC of flavokawin B (purity checked by TLC, followed by sulfuric acid detection) and a hexane maceration of Polygonum ferrugineum aerial parts on silica gel, twice in the same direction with n-hexane – ethyl acetate 4:1 (humidity 33 %). Detection of flavokawin B by densitometry at 366 nm (without derivatization). The hRf value was 53. The content of flavokawin B was 13.6 % in the hexane extract and 1.0 % in the dried plant.