J. Chin. Trad. Med. (Zhongguo Zhongyao Zazhi) 20, 162-164 (1995). TLC on silica with isooctane - isopropyl ether - acetic acid - butanol - water 10:5:5:3:1. Detection by spraying with 30% sulfuric acid in ethanol and heating at 105 °C for 15 min. Quantification by densitometry.

CLB Chemie in Labor und Biotechnik 47, 262-263 (1994). HPTLC screening of carcinogenic amines in textiles on silica with dichloromethane - acetonitrile 5:1. Derivatization by diazotation and coupling with N-(1-naphthyl)-ethylenediammonium dichloride. Visual evaluation (pink to blue zones on a pale background). For confirmation of positive results a 15 step AMD gradient on silica from 80% dichloromethane - acetone 1:1 and 20% hexane to 20% dichloromethane - acetone 1:1 and 80% hexane follows. Alternative chromatography on silica with diisopropyl ether - pentane - diethyl amine 12:8:1. Quantification by densitometry (absorbance) at 200, 230, 280 and 360 nm (multi-wavelength-scan). The detection limit of 20 derivatized amines is between 20-200 ng and of not derivatized between 20-400 ng. Sample preparation includes treatment with dithionite reagent, cleaving azo dyes into their component amines. Very effective screening method. Similar topic published: "Identification and determination of carcinogenic amines of the MAK value list III A1/A2." in Int. Lab. Nov., 29-30 (1996); and "Nachweis und Bestimmung verbotener Amine aus der Spaltung von Textil-Azofarbstoffen. (Identification and determination of banned amines derived from textil azo dyes.) in GIT Fachz. Lab. Spez. Chromatogr. 2, 92-94 (1995).

Indian Drugs 33 (7), 355-357 (1996). HPTLC of antipyrin and paracetamol in plasma on silica with chloroform - methanol 9:1. The linearity range was 0.625 to 2.5 mg/mL for antipyrin and 1.5 to 6.0 mg/mL for paracetamol. Rf value of paracetamol was 0.34 and of antipyrin 0.4.

J. Chin. Trad. Med. (Zhongguo Zhongyao Zazhi) 21, 412-414 (1996). TLC on silica with 1) acetone - toluene - ethyl acetate - NH3 conc. 30:20:10:1 and 2) chloroform - ethyl acetate - methanol - NH3 conc. 40:5:5:1. Detection by spraying with potassium iodobismuthate reagent. Quantification of matrine and oxymatrine by densitometry at 505 nm.

J. Liquid Chromatogr. 19, 815-821 (1996). TLC on micro-crystalline cellulose with methylisobutyl ketone - HCl conc. 2:3. Detection by spraying with 1% KJ in ethanol. Quantification by densitometry of r and Rh bands at 510 nm and 480 nm, respectively.

Separation of the main protein amino acids in a double-layer system. J. Planar Chromatogr. 11, 5-11 (1998). Demonstration of the theoretical aspects of the long-distance development, the basic elements of the double layer cassette for personal OPLC instrument, and the first results in the field of amino acid analysis with special emphasis on the 20 main protein amino acids. HPTLC on single and on double silica gel plates with butanol - acetonitrile - 0.005 M potassium dihydrogen phosphate - acetic acid 1:5:3:1. Detection after treatment with ninhydrin reagent at 490 nm.

GIT Fachz. Lab. 2, 96-98 (1998). HPTLC of hydrocortisone and cinchocaine (2-butoxy-4-quinolinecarboxylic acid(2-diethylamino)-ethylamide) after 15 min chamber saturation on silica gel with toluene - acetone - acetic acid - ethanol 40:30:5:2. Densitometry at 240 nm (absorbance). The intermediate precision (n = 3) was found to be at 0.53% (peak height) and 1.7% (peak area), respectively for hydrocortisone, and at 1.6% (peak height) and 3.3% (peak area), respectively for cinchocaine. Rapid and economic TLC procedure.

Chinese J. Pharm. Anal. (Yaowu Fenxi Zazhi) 18, 123-124 (1998). TLC on silica gel with chloroform - methanol - water 18:8:1. Detection by spraying with 10% sulfuric acid in ethanol and heating at 105°C for 5 min, and under UV 254 nm. Quantitation by densitometry at 340 nm. Precision within plate 0.5% (n=5), plate-to-plate 2.1% (n=5). Recovery >94.3 ± 3.1% (n=3).