Planta med. 66, 452-457 (2000). TLC of amarogentin on silica gel with water-saturated methyl acetate. Visualization under UV and by spraying with vanillin - sulfuric acid and Dragendorff's reagent. Detection by spraying with 0.6% diazotised 4-nitro-o-anisidine in 10% sodium carbonate solution. Quantification by comparison to amarogentin standard.

J. Agric. Food Chem. 51, 1797-1800 (2003). TLC of saponin 1 (3,28-di-O-glu medicagenic acid soyasaponin)and saponin 4 on silica gel with ethyl acetate - acetic acid - water 7:2:2. Visualization by spraying with methanol - sulfuric acid 5: 1 and heating at 120°C.

J. Planar Chromatogr. 19, 187-190 (2006). Comparison of the iridoid composition of ten Stachys species by use of a TLC-densitometric method. TLC of harpagide, acetylharpagide, harpagoside, ajugoside, aucubin, and catalpol on silica gel with chloroform - methanol - water 25:10:1 and, occasionally, ethyl acetate - formic acid - water 9:2:1. Visualization of the spots by use of Ehrlich’s spray reagent (1 % dimethylaminobenzaldehyde in concentrated hydrochloric acid) followed by heating at 105 °C for 5 min. Quantitation by densitometry at 540 nm after 3 h.

J. Planar Chromatogr. 20, 443-446 (2007). TLC of caffeoylmalic acid, forsythoside, and verbascoside on silica gel in an unsaturated chamber with formic acid - acetic acid - water - ethyl acetate 15:15:36:134. Detection by dipping into a 1 % methanolic solution of natural products reagent and heating for 10 min at 40 °C. The dried plates were subsequently dipped into a 5 % methanolic solution of polyethyleneglycol 400 and then heated as before. Quantitation by densitometry at 395 nm ??? in fluorescence mode.

J. Planar Chromatogr. 27, 102-106 (2014). HPTLC of betulinic acid in the leaves of Vitex negundo on silica gel with toluene - acetone - formic acid 17:3:2. Detection by spraying with anisaldehyde sulfuric acid reagent, followed by heating at 105 ºC for 5 min. Quantitative determination by absorbance measurement at 445 nm. The hRf value for betulinic acid was 42. Linearity was in the range of 200-1200 ng/zone. The intermediate/interday/intra-day precisions were below 1.3 % (n=3). The LOD and LOQ were 6 and 18 ng/zone, respectively. Recovery was in the range of 99.7-101.5 %.

J. Planar Chromatogr. 28, 443-447 (2015). TLC of protocatechuic acid (1), chlorogenic acid (2), oleanolic acid (3) and ursolic acid (4) in the extracts of Chaenomeles speciosa on polyamide phase with dichloromethane - ethyl acetate - formic acid 5:4:1 for (1) and (2) or cyclohexane - acetone - ethyl acetate - formic acid 45:10:1 for (3) and (4). Detection by spraying with 0.04 % solution of 2,2-diphenyl-1-picrylhydrazyl in ethanol (DPPH radical reagent) to assess the antioxidant activity. The hRF values for (1) and (2) were 51 and 30, respectively.

Biochem. Biophys. Res. Commun. 478, 1403-1408 (2016). Centrifugal TLC of xanthorrhizol in the rhizomes of Curcuma xanthorrhizza on silica gel with hexane mixed with increasing ratios of chloroform. Concentric spherical bands of the separated compounds were monitored under UV 254 nm and 366 nm on the rotor. When a single band came to the edge of the rotor, the eluate was collected.

J. Chromatogr. Sci. 55 (9), 954-960 (2017). Presentation of a simple, cost-effective and rapid stability-indicating assay for densitometric quantification of methyltestosterone, a synthetic testosterone derivative commonly used for the treatment of testosterone deficiency in males, in pharmaceutical formulation. TLC of methyltestosterone on silica gel with hexane – acetone 13:7. Quantitative determination by densitometry at 254 nm in absorbance mode. Evaluation via peak areas using linear regression. The LOD and LOQ were 2 and 6 ng/zone, respectively. Investigation of the degradation of methyltestosterone by applying various stress conditions such as hydrolysis under acidic, basic and neutral conditions, heating in anhydrous conditions and exposure to light. Good separation of the degraded products caused by photodegradation, acidic and basic hydrolysis, and identification of acid degraded product as 17,17-dimethyl-18-norandrosta-4,13(14)-dien-3-one by spectroscopy. Explanation of the reactivity of methyltestosterone under applied stress conditions by quantum chemical calculations. The developed method proved to be repeatable, selective and accurate for quantification of methyltestosterone and can be employed for routine analysis.