J. AOAC Int. 91, 1237-1243 (2008). HPTLC of zinc bis(O,O’-diisobutyl dithiophosphate), zinc bis(O,O’-didodecyl dithiophosphate), and Aglamol 99 on RP-2 by automated multiple development with methanol - water - acetic acid 632 for 25 mm, then acetonitrile - water 119 for 60 mm, and again acetonitrile - water for 80 mm, or on silica gel with a 14-step gradient based on toluene. For derivatization, the plate was dipped in a solution of 0.05 % primuline in acetone - water 41 for 1 s and immediately dried in warm air. Quantitative determination by fluorescence measurement at 366/>400 nm and by absorbance measurement at 220 nm. HPTLC-ATR-IR and HPTLC-FTIR, as well as HPTLC/DART-MS and HPTLC/ESI-MS were applied for identification.

) (Chinese). Chinese J. Chromatogr. (Sepu) 8, 389-391 (1990). TLC on silica with benzene. Detection by spraying with Dragendorff’s reagent. Determination by standard area calibration. Detection limit 0.1 µg.

J. Planar Chromatogr. 10, 368-371 (1997). HPTLC of EHDAB on RP-18 with preadsorbent layer with methanol - tetrahydrofuran - water 1073 at 20°C and 50% relative humidity. After visualization under UV 254 nm quantification by densitometry at 287 nm. Intermediate precision 4.56% (n=4), recovery 99.6 and 104% from lotion and tanning oil, respectively.

J. Planar Chromatogr. 22, 19-23 (2009). HPTLC of 26 UV filter substances and their photodegradation products on LiChrospher silica gel (prewashed with methanol) by automated multiple development with mixtures of tert-butyl ether - n-hexane. Detection under UV light at 254 and 366 nm. Bioassay by immersion of plates for 1 s in a suspension of Vibrio fischeri bacteria followed by evaluation in dark.

) (Chinese). Chinese J. Chromatogr. (Sepu) 9, 124-126 (1991). TLC of N-(a-pyridyl)-carbazole on silica with cyclohexane - 1,2-dichloroethane 11. Detection under UV. Quantification by densitometry at 285 nm using external standards. CV = 1.9 - 7.4%.

Lubricant analysis Investigation of crankcase lubricant. J. Planar Chromatogr. 12, 228-229 (1999). TLC of rapeseed oil, rapeseed methyl esters and crankcase lubricants on silica gel with hexane - diethyl ether - acetic acid 85151 or hexane - ether 41. Detection by spraying with a 11 mixture of saturated copper acetate in water and 85% orthophosphoric acid, followed by heating at 180°C for 7 min. Quantitation by desitometry at 510 nm.

J. Planar Chromatogr. 23, 339-342 (2010). HPTLC of saccharin in foodstuffs (e. g. cola drinks, lemon juices, betel nut powder, mouth fresheners, ice candy, and tabletop sweeteners) on silica gel with chloroform - methanol - acetic acid 64351 or acetone - isopropanol - acetic acid 60391. Quantitative determination by absorbance measurement at 230 nm. Linearity was between 250 - 1250 ng/µL. The limit of detection and quantification for saccharin were 40 and 130 ng, respectively. Mean recovery from spiked samples was 102.3 % for cola drinks and 98.8 % for lemon juices. Relative standard deviation (% RSD) for cola drinks, lemon juices, ice candy, mouth freshener, betel nut powders, and tabletop sweeteners were 2.1, 4.2, 3.4, 3.0, 4.9, and 4.1 %, respectively.

) (Chinese). Chinese J. Polymer Sch. & Technol. (Gaofenzi Cailiao Kexue Yu Gongcheng) 6, 1-7 (1990). Review with 13 references.