Phytochem. Anal. 31, 801-808 (2020). HPTLC of agarwood on silica gel with chloroform - methanol - distilled water 10:7:5. Detection by absorbance measurement at 254 nm. Agarotetrol was used as reference substance. Qualitative results were in agreement with the liquid extraction surface analysis mass spectrometry method.

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. Chinese Trad. Patent Med. 41 (7), 1728-1731 (2019). Sarcandra glabra (Thunb.) Nakai is a component herbal TCM drug with anti-bacteria, anti-inflammation, and anti-tumor activity. For quality control, TLC on silica gel at 25 % relative humidity and 21 °C with (A) toluene - ethyl acetate - formic acid 9:4:1, (B) cyclohexane - ethyl acetate - formic acid 7:6:1, (C) cyclohexane - ethyl acetate - formic acid 4:5:1. Detection (A) at UV 366 nm, (B) by exposure to ammonia vapor for 10 min and evaluation at UV 366 nm. Identification and assessment by comparison of the fingerprints with standards isofraxidin and rosmarinic acid. The method was successfully used for the analysis of 13 batches of real life samples.

J. Planar Chromatogr. 33, 281-291 (2020). HPTLC of Weikangling capsules (a Chinese patent medicine for treating chronic gastritis, containing Paeoniae Radix Alba, Glycyrrhizae Radix et Rhizoma, Bletillae Rhizoma, Notoginseng Radix et Rhizoma, Poria, Corydalis Rhizoma, Sepiae Endoconcha, and Belladonnae Extractum) on silica gel with chloroform - methanol - water 14:5:1. Detection by spraying with 10 % sulfuric acid in alcohol, followed by heating at 105 ºC for 5 min. Qualitative analysis at UV 366 nm.

J. Planar Chromatogr. 33, 439-448 (2020). HPTLC fingerprint of 182 samples of Sclerocarya birrea and traditional medicines on silica gel with ethyl acetate - formic acid - water 8:1:1. Detection by heating at 100 ºC for 3 min, following by cooling and derivatization with natural products reagent (1.0 g of 2-aminoethyl diphenylborinate in 100 mL of methanol) and subsequently with anisaldehyde reagent (170 mL of ice-cooled methanol with 20 mL of acetic acid, 10 mL of sulfuric acid, and 1 mL of anisaldehyde), and heating at 100 ºC for 3 min. Quantitative determination of quercetin-3-O-rhamnoside by absorbance measurement at 254 nm.

J. Planar Chromatogr. 33, 473-479 (2020). HPTLC of rutin (1), gallic acid (2) and quercetin (3) in the aerial parts of Euphorbia hirta and Euphorbia thymifolia on silica gel with toluene - ethyl acetate - methanol - formic acid 30:15:13:4. Quantitative determination by absorbance measurement at 254 nm. The hRF values for (1) to (3) were 2, 56 and 72, respectively. Linearity was between 40 and 480 ng/zone for (1) to (3). Intermediate precision was below 2 % (n=3). The LOD and LOQ were 15 and 45 ng/zone for (1), 45 and 139 ng/zone for (2) and 20 and 61 ng/zone for (3), respectively. Recovery ranged 98.3-100.2 % for (1), 98.5-99.6 % for (2) and 95.5-99.1 % for (3).

J. Planar Chromatogr. 33, 463-472 (2020). HPTLC of chlorogenic acid in the fruit extracts of Lufa acutangula, Sechium edule, Trichosanthes cucumerina and Trichosanthes dioica on silica gel with ethyl acetate - chloroform - formic acid 12:8:1. Quantitative determination by absorbance measurement at 254 nm. The hRF value for chlorogenic acid was 55. Linearity was between 200 and 1000 ng/zone. Intermediate precision was below 2 % (n=3). Recovery was between 99.7 and 99.9 %.

J. Planar Chromatogr. 33, 353-364 (2020). HPTLC of friedelin (1), methylputranjate (2), putrone (3), roxburghonic acid (4), putranjivadione (5), and roxburghonol (6) in the bark of the plant Putranjiva roxburghii on silica gel with n-hexane - ethyl acetate 9:1. Detection by dipping into perchloric acid reagent (50 mL 70% perchloric acid in 50 mL acetone), followed by heating at 110-120 ºC for 5 min. Quantitative determination by absorbance measurement at 570 nm. The hRF values for (1) to (6) were 79, 46, 36, 31, 25 and 21, respectively. Linearity was between 1 and 5 µg/zone for (1) to (6). Intermediate precision was below 2 % (n=3). The LOD and LOQ were 780 and 2600 ng/zone for (1), 210 and 700 ng/zone for (2), 170 and 570 ng/zone for (3), 350 and 1170 ng/zone for (4), 460 and 1530 ng/zone for (5) and 380 and 1270 ng/zone for (6), respectively. Average recovery was 98.0 % for (1), 99.1 % for (2), 97.6 % for (3), 98.9 % for (4), 98.7 % for both (5) and (6).