J. of Chromatogr. Sci. 58 (5), 427 - 432 (2020). HPTLC of ulipristal acetate (UPA) in presence of its degradation products on silica gel with ethyl acetate - toluene - glacial acetic acid 40:70:3. UPA was subjected to acid and alkali hydrolysis, oxidation, photo and thermal degradation. The hRF of UPA was 38. Quantitative determination by densitometry. The linearity range was between 400-3600 ng/band. LOD was 72 ng/band and LOQ 220 ng/band. The recovery was 100.1-100.7 %. The method is accurate, precise, robust, and specific to measure UPA in presence of degradants.

Planta Med. 84(18), 1348-1354 (2018). A subfraction (obtained through liquid-liquid partition and column chromatography) of the ethanolic extract of whole Vernonia cinerea plants (Asteraceae, subf. Cichorioideae) was further fractioned by reverse-phase SPE (solid-phase extraction) followed by preparative TLC on silica gel layer (eluent not given). For verification, zones were detected by spraying with anisaldehyde solution with 10 % sulfuric acid, followed by heating at 100 °C. Further purification by reverse-phase HPLC allowed the isolation of 6 hirsutinolide-type sesquiterpenoids (all with a oxacyclonane forming an ether bridge), including vernolides A and B.

Planta Med. 84(18), 1340-1347 (2018). Preparative TLC on silica gel for the final purification of 15 phenylethyl-chromenone derivatives (including 3 with epoxide functions), 4 sesquiterpenoids (neopetasane, dehydrokaranone, dioxoselinene, ligudicin C) and a steroid (ergostatetraenone), all isolated through multi-step column chromatography from the ethyl-acetate fraction of a methanolic extract of Aquilaria sinensis resinous wood (Thymelaeaceae). For each compound, mobile phase, RF value and yield are given.

J. of Chromatogr. Sci. 58 (5), 418 - 426 (2020). Development of a method for the quantitation of glibenclamide (GLIBEN), rosiglitazone maleate (ROSI) and metformin hydrochloride (MET) from a combined dosage form by HPTLC on RP-18 F254s aluminum layer with methanol - tetrahydrofuran - water - glacial acetic acid 40:9:10:1. Detection under UV light. The hRf for GLIBEN, ROSI and MET was 54, 62 and 80, respectively. Quantification and photodocumentation by densitometry. For GLIBEN and  ROSI the LOD and LOQ was 80 and 200 ng/zone, for MET the LOD and LOQ was 48 and 120 ng/zone, respectively. The linearity for GLIBEN and ROSI was 200 - 1000 ng/zone (r = 0.9991 for GLIBEN and r = 0.9993 for ROSI) and for MET 120 - 600 ng/zone (r = 0.9988). The method was precise and accurate for all three drugs, and well suitable for the analysis of triglucored tablets, and reliable quality control for GLIBEN, ROSI and MET in a combined dosage form.

J. Chinese Trad. Patent Med. 41 (3), 516-521 (2019). Yiqi Tongmai Capsule is a herbal TCM for activating blood circulation and regulating veins, as to relieve dizziness, chest tightness, chest pain caused by blood stasis. HPTLC for quality control on silica gel (1) for Ligusticum chuanxiong hort, with n-hexane - ethyl acetate 3:1 after presaturation of plates for 20 min, detection under UV 366 nm; (2) for Radix paeoniae rubra, with chloroform - ethyl acetate - methanol - formic acid 80:10:40:1 after presaturation of plates for 20 min, detection by spraying with 5 % vanilline in sulfuric acid - ethanol 1:4 and heating at 105 ˚C until the zones are detected in daylight, comparison with the standard  paeoniflorin; (3) for Panacis Quinquefolii Radix and Panaxnotoginseng (Burk.) F.H.Chen with trichloroform - anhydrous ethanol - water 10:10:1 after presaturation of plates for 15 min, detection by spraying with 10 % solution of sulfuric acid - ethanol 1:4 and heating at 105 ˚C until the zones are detected in daylight and under UV 366 nm, identification by comparison with the standards notoginsenoside R1, ginsenoside Rg1, Re, Rb1 and pseudoginsenoside F11.

J. of Chromatogr. Sci. 58 (5), 411 - 417 (2020). Analysis of a binary mixture of silymarin (SR) and vitamin E (VE) acetate in their pure forms, pharmaceutical formulation and spiked human plasma, by HPTLC on silica gel with hexane - acetone - formic acid 140:60:3, detection at UV 215 nm, and quantification by densitometry. The linearity was 0.2 - 2.5 and 0.2 - 4.5 μg/band for SR and VE, respectively. Accuracy was 99.9 ± 1.2 % and 100.2 ± 1.6 % for SR and VE, respectively. The method was successfullly used for the determination of the studied drugs in their pharmaceutical formulation without any interference from excipients, and in spiked plasma samples. Statistical comparison of the results obtained by this HPTLC method showed no significant difference to the results obtained by the reported HPLC method.

J. of Chromatogr. Sci. 58 (5), 411 - 417 (2020). Analysis of a binary mixture of silymarin (SR) and vitamin E (VE) acetate in their pure forms, pharmaceutical formulation and spiked human plasma, by HPTLC on silica gel with hexane - acetone - formic acid 140:60:3, detection at UV 215 nm, and quantification by densitometry. The linearity was 0.2 - 2.5 and 0.2 - 4.5 μg/band for SR and VE, respectively. Accuracy was 99.9 ± 1.2 % and 100.2 ± 1.6 % for SR and VE, respectively. The method was successfullly used for the determination of the studied drugs in their pharmaceutical formulation without any interference from excipients, and in spiked plasma samples. Statistical comparison of the results obtained by this HPTLC method showed no significant difference to the results obtained by the reported HPLC method.

J. of Chromatogr. Sci. 58 (4), 303 - 308 (2020). Determination of dapoxetine hydrochloride (DAP) and tadalafil (TAD) in their binary mixtures either as raw materials or in pharmaceutical formulations, by HPTLC on silica gel with ethanol - ethyl acetate 1:9. Quantitative determination by densitometry at 222 nm. The linear range was 0.1 - 1.6 and 0.2 - 2.5 μg/band for dapoxetine and tadalafil, respectively, with accuracies of 98.9 % ± 0.6 and 99.3 6% ± 1.4, respectively.