Planta Med. 70, 581-584 (2004). Preparative TLC of mayoecrystal I, a new 11,20:1,20-diepoxy-ent-kaurane diterpenoid, and rubescensin on silica gel by three-fold development with petroleum ether - acetone 4:1. Detection under UV light at 254 nm.

Planta Med. 70, 847-855 (2004). HPTLC and TLC of gymconopin A on silica gel and RP18 with the lower phase of chloroform - methanol - water 15:3:1.Visualization by spraying with 1 % cerium sulfate - 10 % aqueous sulfuric acid, followed by heating.

Detection by spraying with flavone reagent and qualitative determination by absorbance measurement at 254 nm and by fluorescence measurement at 366 nm. The compound having Rf 0.07 reacted to the reagent in solvent system 1. Two compounds at Rf 0.09 and 0.36 reacted in solvent system 2, whereas five compounds having Rf 0.11, 0.35, 0.38, 0.49 and 0.72 reacted to the reagent in solvent system 3.

Pharmazie 62, 558-559 (2007). TLC of the ethyl acetate soluble fraction of an acetone/water extract (2,3-di-O-galloylarbutin) on silica gel with ethyl acetate - acetic acid - water 18:1:1. Visualization by spraying with natural products reagent, vanillin/hydrochloric acid or anisaldehyde/sulfuric acid reagent.

J. Liq. Chromatogr. Relat. Technol. 28, 677-691 (2005). HPTLC of podophyllotoxin and podophyllin on RP-18 in a twin trough chamber with acetonitrile - water 2:3. Densitometric measurement of lignans in absorption mode at 217 nm.

59th Indian Pharmaceutical congress C-323, 302,(2007). TLC of flavonoids and sapogenins from different plant parts (leaves and petals) of Calendula officinialis on silica gel with ethyl acetate - formic acid - glacial acetic acid - water 100:11:11:20, and chloroform - glacial acetic acid - methanol - water 15:8:3:2.

and Dietary Supplements. Chromatographia 66 (9-10), 797-800 (2007). HPTLC of 20-hydroxyecdysone from Sida rhombifolia L. on silica gel plates with chloroform - methanol 4:1. Quantification by densitometry at 250 nm in absorbance mode. Linearity was between 200 and 1000 ng/zone. This method was successfully applied for quantitative evaluation of dietary supplements. In addition, for six different Sida species unique fingerprints were obtained on the HPTLC plate.

CBS 97, 12-15 (2006). HPTLC of flavonoids from green tea (Camellia sinensis) on silica gel in a saturated twin-trough chamber with ethyl formate - toluene - formic acid - water 60:3:8:6. Detection by dipping the hot plate (heated at 100 °C for 2 min) into natural products reagent, followed by drying, dipping into polyethylene glycol 400 (10 g in 200 mL dichloromethane), and drying. Evaluation under UV 366 nm. With this method the geographical origin of the material can be determined. Toluene - acetone - formic acid 9:9:2 allows the discrimination of green from black and other speciality teas, based on the polyphenol pattern. Detection by dipping the hot plate into a solution of Fast Blue Salt B. Evaluation under white light. For investigation of the alkaloid profile ethyl acetate - methanol - water 20:2.7:2 and evaluation under UV 254 nm is used. The amino acid profile is analyzed by using 1-butanol - acetone - acetic acid - water 7:7:2:4. Detection by dipping in ninhydrin reagent, followed by heating at 110 °C for 3 min. Evaluation under white light.