J. Planar Chromatogr. 34, 559-560 (2021). HPTLC fingerprint of Ginkgo biloba finished products on silica gel with n-butyl acetate - methanol - water - formic acid 15:4:2:2. Detection by dipping into anisaldehyde reagent (1 mL of p-anisaldehyde in 200 mL of a mixture of methanol, acetic acid and sulphuric acid 17:2:1). Qualitative identification under UV light at 254 nm and 366 nm. 

J. Planar Chromatogr. 34, 531-542 (2021). HPTLC of betulinic acid (1), β‑sitosterol (2) and lupeol (3) in fruits, leaves, root and stem bark of Dillenia pentagyna on silica gel with petroleum ether - ethyl acetate - acetonitrile 82:18:1. Detection by dipping into anisaldehyde sulfuric acid reagent, followed by heating at 105 °C for 5 min. Quantitative determination by absorbance measurement at 580 nm. The hRF values for (1) to (3) were 17, 23 and 36. Linearity was between 120 and 440 ng/zone for (1), 200 and 1000 ng/zone for (2) and 60 and 220 ng/zone for (3). Interday and intra-day precisions were below 2 % (n=5). The LOD and LOQ were 91 and 276 ng/zone for (1), 304 and 921 ng/zone for (2) and 41 and 125 ng/zone for (3), respectively. Average recovery was 100.7 % for (1), 101.7 % for (2) and 102.0 % for (3). 

J. Planar Chromatogr. 34, 493-502 (2021). HPTLC of quercetin (1), beta-sitosterol (2), piperine (3), gallic acid (4) and resveratrol (5) in Krishnadi Churna on silica gel with toluene - chloroform - methanol 4:4:1 for (3), toluene - ethyl acetate - ethanol - methanol - formic acid 20:15:10:5:1 for (4), toluene - ethyl acetate - methanol - formic acid 50:40:10:2 for (1) and toluene - ethyl acetate - methanol - formic acid 60:30:10:3 for (2) and (5). Quantitative determination by absorbance measurement at 366 nm. The hRF values for (1) to (5) were 52 for (1), 64 for (2), 77 for (3), 61 for (4) and 45 for (5). Linearity was between 2 and 14 µg/mL for (1), (2) and (5), 1 and 18 µg/mL for (3) and 3 and 15 µg/mL for (4). The LOD and LOQ were 3 and 8 µg/zone for (1), 2 and 6 µg/zone for (2), 5 and 16 ng/zone for (3), 8 and 3 µg/zone for (4) and 8 and 3 µg/zone for (5). Average recovery was 99.2 % for (1), 98.4 % for (2), 98.6 % for (3), 98.9 % for (4) and 99.1 % for (5). 

J. Planar Chromatogr. 34, 377-401 (2021). HPTLC of flavonoid glycosides, phloroglucinol glycosides, monoterpene glycosides and monoterpene sugar esters, triterpenoids, phloroglucinols, monomeric phloroglucinols, dimeric phloroglucinols and phloroglucinol-terpene adducts in 15 eucalypts (13 Eucalyptus and 2 Corymbia) on silica gel with multiple mobile phases. Detection by spraying with anisaldehyde-sulfuric acid reagent. Zones were scanned from 200 to 700 nm.

J. Planar Chromatogr. 34, 419-426 (2021). HPTLC of brazilin on silica gel with chloroform - acetone - formic acid 8:4:1. Detection by exposure to ammonia vapor, followed by spraying with aluminum chloride. Quantitative determination by absorbance measurement at 508 nm. Linearity was between 0 to 6 μg. Intermediate precisions were below 3 %. Recovery was between 100 and 105 %.

J. Planar Chromatogr. 34, 315-322 (2021). HPTLC of quercetin (1) and isorhamnetin (2) in the fruits of Hippophae rhamnoides on 3 % sodium acetate silica gel with dichloromethane - ethyl acetate - formic acid 7:3:1. Detection by spraying with 1 % ethanol solution of aluminum trichloride. Quantitative determination by absorbance measurement at 390 nm. The hRF values for (1) and (2) were 48 and 64, respectively. Linearity was between 60 and 420 ng/µL for (1) and 40 and 440 ng/µL for (2). The intermediate precision was below 5 % (n=6). LOD and LOQ were 50 and 165 ng for (1) and 50 and 167 ng for (2). Recovery was between 97.1 and 103.4 % for (1) and 98.1 and 103.9 % for (2).

J. Planar Chromatogr. 34, 345-351 (2021). HPTLC of Croton tiglium extracts on silica gel with toluene - ethyl acetate 9:1, toluene - ethyl acetate - methanol 6:4:1, toluene - ethyl acetate 3:2, toluene - ethyl acetate - methanol 4:6:1. Detection by spraying with anisaldehyde - sulfuric acid reagent. Identification of steroids and terpenoids on silica gel with toluene - ethyl acetate 9:1 and detection by spraying with the Liebermann‒Burchard reagent, followed by heating at 100 °C. Acidic compounds were analyzed on silica gel with toluene - ethyl acetate 9:1, followed by spraying with bromocresol green reagent. Coumarins were analyzed on silica gel with toluene - ethyl acetate - methanol 4:6:1, followed by spraying with alcoholic potassium hydroxide reagent and visualization under UV light at 366 nm.

J. Planar Chromatogr. 34, 337-343 (2021). HPTLC of quercetin in the leaves of Coriandrum sativum on silica gel with formic acid - ethyl acetate - toluene 1:4:5. Quantitative determination by absorbance measurement at 254 nm. The hRF value for quercetin was 50. Linearity was between 20 and 1000 ng/zone. LOD and LOQ were 15 and 44 ng/zone, respectively. Intermediate precisions were below 2 % (n=3). Recovery was between 97.0 and 98.0 %.