J. Pharm. Biomed Anal. 46(2), 391-394 (2008). HPTLC of conessine silica gel aluminum plates with toluene - ethyl acetate - diethyl amine 13:5:2 in a twin trough chamber saturated with mobile phase at 25 °C. Detection by spraying with modified Dragendorff's reagent. Quantification by densitometry in absorbance mode at 520 nm. Linearity was between 1 and 10 µg/zone (r2 = 0.9998).

Food Chem. 79, 337-342 (2002). HPTLC of polyphenol compounds (caffeic acid derivatives, quercetin and kaempferol glycosides) in the leaves of Lactuca sativa on RP-18 with water – methanol – acetic acid 25:25:3. Detection by dipping into a solution of 1 % ethanolamine diphenylborate in methanol for 24 h. Quantitative determination by absorbance measurement at 365 and 440 nm. The total flavonoid amount is expressed as isoquercitrin using a three point regression curve in the range of 1 and 5000 ng/zone.

Pharmazie 63, 405-407 (2008). TLC of (+)-haemanthamine on silica gel or on RP-18. Detection by spraying with Dragendorff reagent or with 1 % cerium sulfate - sulfuric acid, followed by heating.

Phytochem. Anal. 19, 236-243 (2008). HPTLC of curcumin (1), demethoxycurcumin (2), and bisdemethoxycurcumin (3) in the rhizome of Curcuma longa L. on silica gel with toluene - acetic acid 4:1 for curcuminoid separation and n-hexane - ethyl acetate - acetic acid 16:5:1 for quantification of total curcuminoid content. Quantitative determination by absorbance measurement at 254 nm. To determine the free radical-scavenging activity of individual compunds, the plate was dipped into a 0.5 mM solution of 1,1-diphenyl-2-picrylhydrazyl (DPPH radical) in methanol for 5 s, dried in darkness at room temperature and heated at 60 °C for 30 s. Quantitative determination by absorbance measurement at 517 nm as negative peaks. The hRf values were 50, and 25 for (1) and (3), respectively. Linearity was between 80 and 250 ng/spot for (1), 40 and 280 ng/spot for (2), and 85 and 270 ng/spot for (3). The limits of detection and quantification were 20 and 60 ng/spot for (1), 10 and 30 ng/spot for (2), and 25 and 75 ng/spot for (3). Recoveries were 99.0 %, 96.9 %, and 95.8 %, (reference value 80 %), respectively. The intermediate/interday/intra-day precision for (1), (2), and (3) was 3.15 %, 3.00 %, and 2.85 %, (n=6), respectively. For the free radical-scavenging activity, linearity was between 70 and 400 ng for (1), 50 and 550 ng for (2), and 60 and 250 ng for (3). The limits of detection and quantification were 40 and 70 ng for (1), 25 and 50 ng for (2), and 45 and 60 ng for (3). The intermediate/interday/intra-day precision for (1), (2), and (3) was 6.50 %, 2.30 %, and 1.50 % (n=6), respectively.

J. Liq. Chromatogr. Relat. Technol. 30, 2941-2951 (2007). TLC of 6-gingerol and 6-shogaol in commercial Ginger on silica gel with n-hexane - diethyl ether 2:3. Detection by spraying with anisaldehyde - sulfuric acid reagent. Evaluation under white light and quantitative determination by absorbance measurement at 577 nm.

J. Planar Chromatogr. 21, 167-171 (2008). HPTLC of gallic acid and ellagic acid on silica gel with toluene - ethyl acetate - formic acid 5:5:1 and 40:25:4 in a twin trough chamber saturated for 30 min. Detection under UV light at 254 and 366 nm and under visible light after derivatization with anisaldehyde reagent. Quantitative determination by absorbance measurement at 272 nm.

Chromatographia 69 (5-6), 597-599 (2009). TLC of karanjin in the seeds of Pongamia pinnata on silica gel with toluene - ethyl acetate 7:3. Quantitative determination by absorbance measurement at 260 nm. The limit of detection was 100 ng, linearity was 50 - 300 ng. Four samples of P. pinnata from different geographical locations were screened for their karanjin content.

J. Chinese Trad. Patent Med. 29 (4), 540-542 (2008). TLC of Tianbing Tiaodu capsule extracts on silica gel with cyclohexane - ethyl acetate 4:1. Detection 1) by spraying with vanillin reagent (5 % vanillin in sulfuric acid - ethanol 1:6) and heating until the zones were visualized; 2) under UV 365 nm. Identification by comparison of the chromatograms with that of the standard ferulic acid.