J. Chinese Trad. Patent Med. (Zhongchengyao) 27 (7), 769-772 (2005). TLC of the extracts of Yixuning tablets on silica gel with 1) ethyl acetate - chloroform - formic acid 15:30:1; 2) toluene - ethyl acetate - formic acid 90:5:2; 3) cyclo hexane - ethyl acetate 9:1. Detection under UV 365 nm. Identification by fingerprint techniques. Quantification by HPLC.

Indian Drugs 42 (9), 592-596 (2005). HPTLC of rutin in Ginkgo biloba from a solid dosage form, on silica gel with n-butanol - n-propanol - chloroform - acetic acid-water 4:1:2:1:1 containing 1 % formic acid. Quantitative determination by absorbance measurement at 254 nm. Rf value of rutin was 0.24. The method was linear in the range of 30-70 ng/µL. No interference was observed from excipients present in solid dosage form.

Chinese J. Chromatogr. (Sepu) 24 (1), 69-72 (2006). TLC of dimethyl phthalate (DMP), diethyl phthalate (DEP), di-n-butyl phthalate (DBP) and di (2-ethylhexyl) phthalate (DEHP) in plastic food-packaging bags. Extraction with ethanol by ultrasonication, followed by filtration through a membrane of 0.45 µm. Development with ethyl acetate - anhydrous ether - isooctane 1:4:15 on silica gel. Quantitative determination by densitometry at 275 nm (reference wavelength 340 nm) by use of an external standard. Good linearities were obtained for DMP, DEP, DBP and DEHP. The detection limits were 2.1 ng for DMP, 2.4 ng for DEP, 3.4 ng for DBP and 4.0 ng for DEHP. The relative standard deviations of the four phthalates were 2.8-3.5 %. The recoveries of the four phthalate standards in real sample were 79-111 %. The method presented has the advantages of high precision, high sensitivity, small sample size, and simple pretreatment. The contents in real samples were close to the results by gas chromatography.

J. Planar Chromatogr. 19, 307-312 (2006). TLC of 2,6-disubstituted 7-methylpurines and 6-mercaptopurine on RP-18 with mixtures of acetone and buffer (sodium acetate - veronal, pH 7.0). Detection in UV light at 254 nm. Partly good agreement was obtained between experimental log P (TLC) values and calculated Clog P values.

by thin-layer chromatography) (Chinese). J. Chinese Trad. Patent Med. (Zhongchengyao) 27 (8), 941-944 (2005). TLC of betaine on silica gel with acetone - ethanol - hydrochloric acid 10:6:1. Detection by spraying with a solution of potassium iodobismuthate. Quantitative determination by densitometry at 515 nm. Validation regarding linearity range (8.0 - 39.0 µg, r = 0.9992), precision (RSD = 1.62 %, n = 6), reproducibility (RSD = 2.14 %, n = 6), and recovery (99.75 %, RSD = 1.92 %, n = 6). Results are given for 12 real life samples. Discussion of the advantages of the method compared to HPLC.

Acta Chrom. 11, 171-182 (2001). The chromatographic behaviour of some cations (Ni2+, Co2+, Cd2+, Cu2+, UO22+, VO2+, Fe2+/3+, Al3+, Th4+, Mo6+, W6+, Pb2+, Hg+/2+, Bi3+, Ag+, and Tl+) and anions (CrO42-, Cr2O72-, IO3-, IO4-, BrO3- SCN-, Fe(CN)63-, NO2-) was examined on layers prepared from 1:9 mixtures of a synthetic inorganic ion-exchanger (stannic arsenate or tin(IV) molybdosilicate) with silica gel, alumina, or cellulose with 1 % methanolic tri-n-butyl phosphate – 1 M aqueous formic acid 1:4 as mobile phase. Several binary cation separations of analytical interest were achieved. The metal ions were detected by use of conventional spot-test reagents. Separation of IO3- from NO2- and BrO3- under the same conditions, detection with 0.2 - 0.5 % diphenylamine in 2 M H2SO4. For quantitative determination the region corresponding to IO3- was isolated from the plate and extracted with 1.0 M hydrochloric acid. 1 % potassium iodide and conc. hydrochloric acid were added to the extract and the mixture obtained was titrated against Na2S2O3.

Juss) as determined by a combination of chromatographic and spectral techniques. J. Liq. Chromatogr. & Relat. Technol. 30,11-25 (2007). TLC on silica gel with petroleum ether - acetone 25:2; detection by spraying with 50 % ethanolic sulfuric acid and heating at 200°C. Isolation, purification and quantification of lipid classes by preparative TLC; detection by spraying the edges with 2’,7’-dichlorofluorescein for visualization under UV. Preparative separation of acylglycerols, free fatty acids, and polar lipids on silica gel with petroleum ether - acetone - acetic acid 70:30:1. Quantitative Ag-TLC on silica gel impregnated by dipping into a 0.5 % methanolic silver nitrate solution - also preparative Ag-TLC. Quantitative TLC on RP by densitometry at 450 nm. Ag-TLC provided the quantitative data for the TAG classes differing in unsaturation, and RP-TLC for the TAG species differing in chain length within a given class.

Pharmazie 62, 226-230 (2007). TLC of two metabolites of the sesquiterpene lactone parthenin on RP-18 and silica gel with dichloromethane - methanol 19:1. Detection by spraying with vanillin-sulfuric acid followed by heating. Also TLC method for detection of hydroperoxy radical: the developed chromatogram was air dried, sprayed with a freshly prepared spray reagent (50 mL of 1 % ethanolic solution of ferrous ammonium sulfate were mixed with 5 mL of 1 M sulfuric acid, and added to 5 mL ethanolic solution of ammonium thiocyanate). A dark red coloured zone was considered as a positive result. Ascaridol and hydrogen peroxide were used as positive controls.