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, 481-487 (2020). HPTLC of resveratrol in the fruits of Morus alba on silica gel with hexane - ethyl acetate - glacial acetic acid 40:60:1. Quantitative determination by absorbance measurement at 302 nm. The hRF value for resveratrol was 56. Linearity was between 100 and 1600 ng/zone. Intermediate precision was below 2 % (n=6). The LOD and LOQ were 16 and 46 ng/zone, respectively. Recovery was between 90.3 and 96.5 %.

J. Planar Chromatogr. 33, 457-462 (2020). HPTLC of scopoletin (1) and gallic acid (2) in the aerial parts of Jatropha glandulifera on silica gel with toluene - ethyl acetate - glacial acetic acid 75:25:1. Quantitative determination by absorbance measurement at 254 nm. The hRF values for (1) and (2) were 69 and 40, respectively. Linearity was between 100 and 600 ng for (1) and (2). Intermediate precision was below 2 % (n=3). The LOD and LOQ were 70 and 200 ng for (1) and 40 and 100 ng for (2), respectively. Recovery was between 98.8 and 98.9 % for (1) and 97.4 and 98.1 % for (2).

J. Planar Chromatogr. 33, 489-499 (2020). HPTLC of fructose (1), glucose (2) and sucrose (3) in honey on silica gel with 1-butanol-2-propanol - boric acid - water 3:5:1. Detection by spraying with 2 mL of aniline diphenylamine phosphoric acid reagent, followed by heating at 110 ºC for 10 min. The hRF values for (1) to (3) were 14, 32 and 27, respectively. Linearity was between 250 and 1250 ng/zone for (1) to (3). Intermediate precision was below 7 % (n=3). The LOD and LOQ were 22 and 67 ng for (1), 33 and 100 ng for (2) and 21 and 64 ng for (3), respectively. Average recovery was 100.7 % for (1), 101.4 % for (2) and 104.0 % for (3).

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, 501-509 (2020). HPTLC of chloramphenicol (1), dexamethasone sodium phosphate (2) and tetrahydrozoline HCl (3) in the absence or presence of p-nitroacetophenone (4) on silica gel with ethanol - water - ammonia 14:5:1 (method A) and acetonitrile - water - ammonia 20:6:1 (method B). Quantitative determination by absorbance measurement at 242 and 220 nm. The hRF values for (1) to (3) were 76, 65 and 20, respectively, in method A and the hRF values for (1) to (4) were 78, 38, 58 and 87, respectively, in method B. Linearity was 0.1-1.4 µg/zone for (1), 0.2-1.2 µg/zone for (2) and 0.1-0.5 µg/zone for (3) in method A and 0.6-1.8 µg/zone for (1), 0.8-3.2 µg/zone for (2), 0.01-0.1 µg/zone for (3) and 0.3-1.4 µg/zone for (4) in method B. Intermediate precision was below 2 % (n=3). The LOD and LOQ were 30 and 90 ng/zone for (1), 40 and 120 ng/zone for (2) and 20 and 60 ng/zone for (3) in method A and 60 and 180 ng/zone for (1), 130 and 390 ng/zone for (2), 3 and 9 ng/zone for (3) and 70 and 210 ng/zone for (4) in method B. Average recovery was 100.1 % for (1), 100.2 % for (2), 100.6 % for (3) in method A and 100.1 % for (1), 99.9 % for (2) and 100.2 % for (3) in method B.

J. Planar Chromatogr. 33, 511-522 (2020). HPTLC of celecoxib (1) and diacerein (2) on nanosilica gel with n-hexane - ethyl acetate - tetrahydrofuran - glacial acetic acid 35:15:5:4. Quantitative determination by absorbance measurement at 254 nm. The hRF values for (1) and (2) were 59 and 37, respectively. Linearity was between 20 and 320 ng/zone for (1) and 5 and 80 ng/zone for (2). Intermediate precision was below 2 % (n=3). The LOD and LOQ were 7 and 20 ng/zone for (1) and 2 and 5 ng/zone for (2), respectively. Average recovery was 99.9 % for (1) and 99.6 % for (2).