J. Chinese Herb Med. (Zhongcaoyao) 19, 344-345 (1988). TLC on silica with chloroform - methanol 19:2. Quantification by densitometry lS 265 nm and lR 365 nm. Study of the pharmacokinetics of sinomenine in rabbits.

J. Planar Chromatogr. 2, 44-48 (1989). A novel way of predicting Rfs in adsorption TLC with binary mobile phases is presented. Good agreement observed between experimental and calculated Rf values.

J. Planar Chromatogr. 2, 155-157 (1989). Extraction of serum lipids; separation of cholesterol palmitate, oleate, linolate and linoleate on HPTLC silica gel with carbon tetrachloride. Postchromatogr. derivatisation with phosphomolybdic acid in ethanol and heating 2 min. at 100°C. Densitometry by absorbance at 546 nm.

J. Planar Chromatogr. 2, 282-284 (1989). HPTLC of organomercury compounds (methylmercuric chloride, ethylmercuric chloride, phenylmercuric chloride, dimethylmercury, diphenylmercury) on silica with hexane - diisopropyl ether - THF 85:10:5. Detection by dipping into Micheler’s thioketone solution (1 g Micheler’s thioketone dissolved in 100 mL chloroform, daily freshly made up by diluting this solution 1:100 with chloroform) gives more precise and more sensitive results.

Chinese J. Chromatogr. 7, 285-288 (1989). TLC of vinyl sulfone reactive dyes on silica with chloroform - methanol - acetone 18:3:2. Detection by densitometry. Detection limit 10 ng. Measurement and discussion of the reaction rate constant of hydrolysis of 10 dyes having different constitutions.

J. Liquid Chromatogr. 12, 907-917 (1989). Use of simplex optimization for the selection of densitometer slit width and wavelength settings to maximize the reproducibility of the determination of diphenhydramine hydrochloride and pseudoephedrine hydrochloride by TLC on silica. Simultaneous adjustment of the two densitometer parameters in a systematic manner to minimize the sum of the squares of the RSD peak areas from the spots. Rapid establishment of a single set of parameters by the method, giving peak areas with a RSD of less than 1% for each of the components in the formulation.

Optimization of mobile phase, detection and direct evaluation. J. Chromatogr. 502, 385-392 (1990). TLC of phospholipids on silica with a mixture of chloroform – methanol – water. Optimization of the mobile phase by using a mobile solvent composition triangle. Improvement of separation of phospholipids by using acetate buffer (pH 4) in the mobile phase instead of water and by impregnation of the silica layer with phosphoric acid. Detection by spraying with Dittmer-Lester reagent. Quantification by densitometry at 720 nm.

Arzneim.-Forsch. 40, 311-316 (1990). HPTLC of etofenamate and metabolites on silica with cyclohexane – ethyl acetate – formic acid 16:8:1. Quantification by fluorodensitometry at 366 nm after spraying with formaldehyde solution (ethanol – 37% formaldehyde in water – conc. formic acid 5:4:1) and dipping into paraffin.