J. Planar Chromatogr. 32, 205-210 (2019). HPTLC fingerprint of essential oils from five sandalwood species, namely, Santalum album, Santalum spicatum, Santalum austrocaledonicum, Santalum paniculatum, Santalum lanceolatum on silica gel with toluene - ethyl acetate 17:3. Detection by spraying with p-anisaldehyde sulfuric acid reagent. Qualitative identification under UV light at 254 and 366 nm. The hRF value of α-bisabolol was 48. 

J. Planar Chromatogr. 23, 406-410 (2010). TLC and OPLC of essential oil of thyme (thymol, carvacrol, and linalool as standards) on silica gel with chloroform (previously extracted with a 0.1 % aqueous solution of sodium hydrogen carbonate and dried on sodium sulfate to eliminate the stabilizer amylene, free hydrochloric acid, and chlorine) in an unsaturated chamber. Detection at 254 nm, by spraying with vanillin - sulfuric acid reagent (50 mg vanillin with 12 mL ethanol and 200 mL 98 % sulfuric acid) and heating to 70 °C for 10 min, and by use of the BioArena system. Quantitative determination by densitometry at 275 and 600 nm (dual-wavelength measurement).

Shenyang Pharm. Coll. (Shenyang Yaoxueyuan Xuebao) 1, 147-151 (1984). (Chinese) (Determination of curecumol in the volatile oil of curecuma aromatica by thin-layer chromatography.) TLC of curecumol on silica with petrol ether - ethyl acetate 95:5. Detection by spraying with 10 % vanillin in acetic acid - HClO4 15:1. Determination by densitometry.

alba. Planta 174, 59-66 (1988). TLC of geraniol, farnesol, geranylgeraniol and prephytoene alcohol on silica with ethyl acetate - conc. NH3 - isopropanol 3:3:4 on silica impregnated with 5% paraffin in petrol ether (60-80°C) with methanol - water 80:20 saturated with paraffin. The bands were located with a spark chamber, eluted and radioassayed.

Untersuchungen zur Stabilität von Kamille-Handelspräparaten. (Investigation on the stability of camolmile preparations.) Deutsche Apotheker Zeitung 132, 462-468 (1992). TLC of ether extracted oils (chamazulene, cis-En-In-dicycloether, Trans-En-In-dicycloether, bisabolol, bisabololoxid A, bisabololoxid B, matricin) on silica with dichloromethane – ethyl acetate 46:1. TLC of flavonoids (herniarin, umbelliferon, apigenin, apigenin-7-glycoside) on silica (2D). First dimension: ethyl acetate – MEK – water – formic acid 20:10:1:1; drying at 40°C for 20 min. Second dimension: toluene – ethyl acetate – formic acid 24:6:1. Detection of ether extracted oils with anisaldehyde reagent R DAB 9 and heating at 105 °C for 5 min; of flavonoids with Naturstoff-A reagent.

J. Planar Chromatogr. 9, 120 - 125 (1996). HPTLC of 22 compounds (coumarins, psoralens, and polymethoxylated flavones) on silica with n-butyl acetate - hexane 8:2 or chloroform - butyl acetate - hexane 9:1:15. Detection under UV 254 and 366 nm. OPLC technique may be used as a rapid, preliminary method to evaluate contamination or sophistication of citrus essential oils.

Asian Journal of Chemistry 23(1), 385-387 (2011). HPTLC on silica gel with chloroform - ethyl acetate containing 1 % acetic acid. Two well resolved zones with hRf values of 33 and 55 were obtained by illumination at 254 nm. The zones were labelled as substance I and II and used for standardization of the oil. Densitometric evaluation at 265 nm. The linearity range for both substances was 4-100 µg/band. The recovery was in the range of 97.4-98.7 %. Several commercially available tablets and capsules were analyzed for the content of Neem oil using substances I and II as marker (in the absence of chemical markers).

Apoth. Ztg. 125, 1941-1944 (1985). Mexikanische Arnikablüten. Zusammensetzung des ätherischen Öls der Blütenkörbchen von Heterotheca inuloides. (Composition of the essential oil of the inflorescences of heterotheca inuloides cass.) TLC of cadaline, 7-hydroxy-3,4-dihydrocadaline, 4-methoxyisocadaline, caryophyllene-epoxide and calacorene on silica with petrol ether - ethyl acetate - toluene 80:15:15. Detection with anisaldehyde - sulfuric acid reagent.