CBS 84, 9 (2000) HPTLC of aflatoxins on silica gel with chloroform - acetone 9:1. Quantitative determination by fluorescence measurement at 366/>400 nm.

CBS 92, 1-3 (2004). HPTLC of cinchocaine hydrochloride from suppositories on silica gel with 1-butanol - toluene - ethanol - water - 100 % acetic acid 10:8:7:4:1 over 30 mm followed by heating at 110 °C for 10 min. Quantitative determination by fluorescence measurement at 313/>400 nm.Precision is 2 % and recovery 101 %.

J. Planar Chromatogr. 17, 102-108 (2004). For sample preparation a methanolic salicylic acid solution was sprayed onto a 40x40 cm glass plate. Samples from different positions of the test plate were extracted with methanol and analyzed by HPTLC and HPLC. HPTLC of salicylic acid on silica gel with cyclohexane - isopropanol - chloroform - acetic acid 12:1:1:2. Quantitation by densitometry. Measurement uncertainty in HPTLC and HPLC is relatively small and has no effect on recovery. To come close to the true value the analytical procedure must be managed by well-considered selection of number and positions of sampling locations. TLC is an excellent analytical technique which gives reliable results.

J. Planar Chromatogr. 17, 156-158 (2004). HPTLC of eight 8-alkyltheophyllines (theophylline, methyl-, propyl-, butyl-, heptyl-, tridecyl-, benzyl-, phenylethyltheophylline) on RP18 with mixtures of methanol and phosphate buffer pH 7.5 (containing between 50 and 90 % methanol). Detection under UV at 280 nm.

J. Planar Chromatogr. 17, 420-423 (2004). A new on-line TLC-MS interface, with computer-controlled extraction of substances from selected spots on a TLC or HPTLC plate, has been constructed. The controlled collection of the sample and its programmed injection into the mass spectrometer is the advantage of this type of interface. It has been tested and validated with a standard solution of caffeine as test substance. HPTLC of caffeine on silica gel with dichloromethane - methanol 9:1. Quantification with a video-documentation system.

J. Planar Chromatogr. 17, 328-334 (2004). HPTLC of eighteen pesticides (propaquizafob, quizalofop-P, triadimefon, triadimenol, dimethomorf, quinoxyfen, cyromazine, oxyfluorfen, fluoroglycofen, acetochlor, metazachlor, imazapyr, furalaxyl, triclopyr, buprofezin, pyriproxyfen, fenoxycarb, piperonyl butoxide) on cyano phase. The greatest spread of separated compounds was obtained by combining nonaqueous normal-phase mobile phases (tetrahydrofuran or ethyl acetate in n-heptane 1:4 in the first direction and aqueous reversed phases mobile phases (methanol - water 7:3 or acetonitrile - water 1:1) in the second dimension. Detection under UV light at 254 or 366 nm. Videoscanning and densitometry at 254 nm.

Chinese J. Trad. Pat. Med. (Zhongchengyao) 26 (9), app.17-19 (2004). HPTLC on silica gel with 1) toluene - acetone - ethanol - ammonia 20:25:3:2; 2) n-hexane - ethyl acetate - glacial acetic acid 15:5:1; 3) n-hexane - ethyl acetate - ammonia 20:20:1. Detection 1) by spraying with 5 % potassium iodobismuthate solution; 2) by spraying with 1 % potassium permanganate in diluted sulfuric acid followed by heating at 120 ºC, and under UV 360 nm. Identification by fingerprint technique. Determination of the content of aconitine by comparison with standard.

Chinese J. Trad. Pat. Med. (Zhongchengyao) 26 (9), app.19-20 (2004). HPTLC on silica gel with petroleum ether (30 - 60 ºC) - formic acetate - formic acid 15:5:1, at 11 ºC and humidity of 40 %. Detection by exposing to ammonia vapors. Identification by fingerprint technique and comparison with the standards.