J. Planar Chromatogr. 33, 365-370 (2020). HPTLC of lupeol (1) and β-sitosterol (2) in the stem bark of Crataeva nurvala on silica gel with toluene - methanol 24:1. Detection by spraying with 1 % anisaldehyde - sulfuric acid reagent, followed by heating at 110 ºC. Quantitative determination by absorbance measurement at 545 nm. The hRF values for (1) and (2) were 48 and 34, respectively. Linearity was between 2 and 6 µg/zone for both (1) and (2). Intermediate precision was below 2 % (n=3). The LOD and LOQ were 43 and 133 ng/zone for (1) and 57 and 173 ng/zone for (2), respectively. Average recovery was 98.6 % for (1) and 98.1 % for (2).

J. Planar Chromatogr. 33, 321-326 (2020). HPTLC of astragaloside IV (1) and calycosin-7-O-β-glucoside (2) from raw and honey-processed Radix Astragali on silica gel with chloroform - methanol - water 13:7:2. Quantitative determination by absorbance measurement at 365 nm. The hRF values for (1) and (2) were 36 and 68, respectively. Linearity was between 0.25 and 2.05 µg for (1) and 0.073 and 2.94 µg for (2). Intermediate precision was below 2 % (n=3). The LOD and LOQ were 42 and 126 ng for (1) and 15 and 45 ng for (2), respectively. Average recovery was 98.7 % for (1) and 99.1 % for (2).

J. Planar Chromatogr. 33, 293-300 (2020). HPTLC of bavachin (1), bakuchiol (2), and psoralen (3) in the seeds of Psoralea corylifolia on silica gel with toluene - ether 1:1. Quantitative determination by absorbance measurement at 254 nm. The hRF values for (1) to (3) were 48, 87 and 75, respectively. Linearity was between 1000 and 11000 ng for (1) to (3). Intermediate precision was below 2 % (n=3). The LOD and LOQ were 275 and 832 ng for (1), 317 and 962 ng for (2) and 108 and 329 ng for (3), respectively. Average recovery was between 98.0 and 99.0 % for (1) to (3).

Phcog. Mag. 15, 440-448 (2019). HPTLC fingerprint of Psidium guajava on silica gel with toluene - ethyl acetate - formic acid 6:3:1. Qualitative determination under UV light at 254 and 450 nm. The hR_F values of common metabolites were 3, 18 and 42 in both aqueous and n‑butanol fractions.

Pharmacogn. Mag. 16, 227-234 (2020). HPTLC fingerprint of Evolvulus alsinoides on silica gel with toluene - ethyl acetate - formic acid 14:6:1. Qualitative determination under UV light at 254 nm. Detection of antioxidant molecules using 2,2‑Diphenyl‑1‑picrylhydrazyl (DPPH) assay.

Pharmacogn. Mag. 15, 462-467 (2019). HPTLC of diosgenin in the rhizome of Costus speciosus on silica gel with n‑hexane - ethyl acetate 7:2. Detection by spraying with anisaldehyde‑sulfuric acid reagent. Quantitative determination by absorbance measurement at 440 nm. The hRF value for diosgenin was 23. Linearity was between 10 and 90 ng/zone. Intermediate precisions were below 5 % (n=2). The LOD and LOQ were 907 and 2751 ng/zone, respectively. Mean recovery was 100.3 %.

J. Sep. Sci. 43, 1431-1439 (2020). HPTLC fingerprint of flavan-3-ols and proanthocyanidins in five different Rosa species (R. canina, R. glutinosa, R. rubiginosa, R. multiflora, and R. spinosissima) on silica gel with n-propanol - water - acetic acid 4:2:1. Detection by dipping into 4-dimethylaminocinnamaldehyde solution (60 mg  in 13 mL of concentrated hydrochloric acid, which was made up to 200 mL with ethanol). Qualitative determination under UV light at 366 nm. The blue zones visible on the derivatized plate were used for further analysis using a TLC-MS interface. The flavanol and proanthocyanidin profiles of Rosa species depend on the geographical origin rather than on the cultivar and genotype.

J. Sep. Sci. 43, 1566-1575 (2020). HPTLC of phenyl myristate in the bark and leaves of Homalium nepalense on silica gel with chloroform - methanol 9:1. Quantitative determination by absorbance measurement at 254 nm. The hR_F value for phenyl myristate was 49. Linearity was in the range of 100-500 ng/5 µL. Intermediate precisions were below 1 % (n=5). The LOD and LOQ were 3 and 10 ng/5 µL, respectively. Average recovery was  between 90.1 and 95.6 %.