Chinese J. Chromatogr. (Sepu) 10, 339-341 (1992). TLC of shale oil on silica with toluene, toluene - acetone 9:1, and acetone. Elution of alkane and alkene, aromatics, oxygen and nitrogen containing compounds with hexane - toluene 4:1. Characterization by GC-MS. 100 compounds were identified.

Sanguisorba alpina.) (Chinese). J. Chinese Herb. Med. (Zhongcaoyao) 24, 451-454 (1993). TLC of ethanol extracts of Sanguisorba alpina on silica with petrol ether - acetone in different ratios. Preparation of the separated zones by elution and crystallization. Identification of 11 constituents by measuring their physical-chemical parameters, and by IR and NMR.

Appl. Spectrosc. 48, 394-399 (1994). Description of the nondestructive detection of analyte spots on TLC plates using the title technique, employing a transmittance geometry and a set of 18 interference filters for wavelength selectivity. Discussion of the influence of the plate thickness nonuniformity and varying amounts of water vapor adsorption onto silica plates. Compensation for the variation in sin silica plates by obtaining reference spectral scans of the plates before performing the chromatography. Detection limit near 1 µg.

J. Liquid Chromatogr. 18, 1655-1662 (1995). Separation of the title compounds by centrifugal partition chromatography (CPC) using a biphasic mixture of ethyl acetate - 1-butanol - water and gradient elution. Analysis of the fractions by TLC on silica with ethyl acetate - 1-butanol - water 1:4:3. Visualization by spraying with sulfuric acid and heating at 100 °C for 10 min. Identification by 13C NMR.

J. Chinese Pharm. Univ. (Zhongguo Yaoke Daxue Xuebao) 26, 353-355 (1995). TLC of saikisaoponin on silica with chloroform - pentane - methanol - butanol - acetic acid - water 60:36:22:9:4:2. Detection under UV 254 nm. Quantification by spectrophotometry at 545 nm after elution.

J. Planar Chromatogr. 10, 217-219 (1997). TLC of phenolphthalein glucuronide and salicylic acid on RP-18 silica with methanol - water 3:1. Visualization under UV 254 nm. The spectra shown in the publication represent the first demonstration that HR MAS (high resolution magic-angle-spinning) can provide NMR data for compounds such as these directly, without the need for their elution from the stationary phase.

J. Chinese Trad. Patent Med. (Zhongchengyao) 20 (2), 23-25 (1998). TLC on silica gel with chloroform - ethyl acetate - methanol 50:1:1. Detection by spraying with 0.5% phosphomolybdic acid in ethanol and heating at 110°C for 8-10 min. Quantitation of b-cholesterol by densitometry at 600 nm, and of total flavonoids by UV spectrophotometry. Precision for b-cholesterol = 2.94% (n=4). Recovery 98.64 ± 2.28% (n=4).

of Crop Sci., Univ. of Illinois at Urbana-Champaign, 240 Edward R. Madigan Lab., 1201 West Gregory Drive, Urbana, IL 61801, USA): Detecting and characterizing N-acyl-homoserine lactone signal molecules by thin-layer chromatography. Proc. Natr. Acad. Sci. USA 94, 6036-6041 (1997). TLC of N-acylated derivatives of L-homoserine lactone (acyl-HSLs) on RP-18 with methanol - water 3:2. The spots were visualized by overlay of a bacterial reporter strain. Spots of preparative TLC were scraped off and submitted to Electrospray ionization mass spectrometry (ESIMS).