J. Liq. Chromatogr. Relat. Technol. 30, 2021-2036 (2007). TLC of carotenoid colorings of 95 commercial foods (33 for tomato color [lycopene], 38 for orange color [e.g. fatty acid ester of beta-cryptoxanthin], and 24 for marigold colorings [fatty acid ester of lutein]) on RP-18 with acetonitrile - acetone - n-hexane 11:7:2 and acetone - water 9:1. TLC of beta-carotene and paprika colorings of 77 commercial foods (e.g. capsanthin and its esters) on RP-18 with n-hexane - acetone - acetonitrile 2:7:1. TLC of quinone colorings (lac and cochineal colors) on RP-18 with methanol - 0.5 mol/L oxalic acid 11:9. TLC of anthocyanin colorings of 45 commercial foods (red cabbage color [derivatives of cyanidin acylglycoside]) on RP-18 with acetonitrile - 0.2 mol/L trifluoroacetic acid 1:2. Identification by recording of visible absorption spectra.

Anal. Chim. Acta 593 (2), 224-237 (2007). Presentation of a novel atomic-contribution system for predicting RM values by TLC on silica gel with 13 screening systems where the large experimental datasets (198-761 RM values) are available. RM values could be predicted with less than 0.5 % error in the majority of solutes (besides several outliers), which corresponds to an hRf value difference of 28 in the worst case. Validation of the system by dividing the data into training and validation datasets, proving its accuracy. The main reason for outliers were large conjugated heterocycles, quarternary ammonium cations, large amount of polar atoms or very simple but unique molecules. The method invloves easy manual calculation and no need for a software. It was applied to predict retention of new compounds in existing chromatographic screening systems.

J. Planar Chromatogr. 22, 97-100 (2009). TLC of (+)-catechin, (-)-epicatechin, (-)-epigallocatechin, (-)-epicatechin gallate, (-)-epigallocatechin gallate, theaflavin, theaflavin 3-gallate, theaflavin 3’-gallate, and theaflavin 3,3’-digallate on polyamide phase in a horizontal chamber (saturated for 15 min) by twofold development with chloroform - methanol 2:3 or n-butanol - acetone - acetic acid 5:5:3. Separation of the flavonols myricetin, quercetin, kaempferol, rutin and the phenolic acids gallic acid, chlorogenic acid, and caffeic acid was achieved by twofold development with chloroform - methanol 2:3. Detection by spraying with iron(III) chloride solution and evaluation under daylight. Quantitative determination by absorbance measurement at 600 nm.

J. Planar Chromatogr. 21, 249-250 (2008). HPTLC of diazepam, oxazepam, nitrazepam, lorazepam, chlordiazepoxide, and flurazepam on silica gel in a saturated twin trough chamber with chloroform - methanol 9:1. Detection by spraying with 5 % sodium hydroxide solution followed by 1 % m-dinitrobenzene in dimethyl sulfoxide. Violet bands were obtained for diazepam, the other compounds did not react. The sensitivity of this reagent for diazepam is approx. 5 µg/spot.

grown in Jamaica. J. Agric. Food Chem. 56, 3664-3670 (2008). HPTLC of curcumin from the rhizomes of Curcuma longa on silica gel with chloroform - ethyl acetate 19:1. Detection by spraying with ammonium molybdate 5 % in aqueous sulphuric acid and examination under UV 254 nm. The hRf value of curcumin was 57.

Phytochem. Anal. 18, 209-212 (2007). Separation of extracts of Solanum diflorum and Setaria parviflora by TLC on silica gel, cellulose, and RP-18 and by HPTLC on cyano and diol phase with hexane - ethyl acetate 1:1 and n-butanol - formic acid - water 5:1:4 (upper phase). Detection after distribution of ß-glucuronidase staining solution (52.5 mg agar and 0.9 mL 0.5 % iron(III) chloride solution). After solidification of the staining solution, the TLC plate was incubated for 120 min at 37 °C and immersed in a 0.2 % solution of esculin. Autography showed enzyme inhibition zones with hRf of 14 (Solanum diflorum) and 46 (Setaria parviflora).

J. Chinese Trad. Patent Med. 30 (10), 1478-1482 (2008). TLC of Fangji Guanjie pill extracts on silica gel with 1) petroleum ether (60-90 ºC) - ethyl acetate 10:1; 2) ethyl acetate - formic acid - glacial acetic acid - water 15:1:1:2; 3) petroleum ether (60-90 ºC) - ethyl acetate 17:3; 4) chloroform - methanol - water 40:10:1; 5) diethyl ether - chloroform - methanol 4:2:1. Detection 1) under UV 254 nm; 2) by spraying with 10 % sulfuric acid in ethanol; 3) by spraying with dinitrophenylhydrazine in ethanol and heating at 105 ºC; 4) by spraying with 5 % potassium iodobismuthate solution. Identification by comparison with the standards fangchinoline and tetrandrine.

Chinese J. Pharm. Anal. 28 (3), 470-471 (2008). TLC of glucocorticoid in TCM formulations extracted with chloroform – methanol 9:1 on silica gel with dichloromethane – diethyl ether – methanol – water 385:60:15:2. Detection by spraying with a solution of tetrazolium blue chloride. Successful separation and identification of five glucocorticoids.