J. Planar Chromatogr. 4, 337-338 (1991). TLC of aminophenazone on silica with chloroform - ether - methanol 7:5:1. Measurement of the absorbance after extraction against reference solution (extraction of the ion associate of iron (III) with 1,10-phenanthroline and bromophenol blue).

Part 12: Quality assessment in QTLC. J. Planar Chromatogr. 6, 62-65 (1993). Description of a program with a built-in quality assessment routine for quantitative evaluation of TLC. Together with the quantitative results, the quality of the data and the system used are also documented. Errors arising from the scanner, applicator, and chromatography, given in relative standard deviation, can be determined from the additivity of variances of these measurements.

J. AOAC Int. 76, 644-649 (1993). TLC of isomerized linoleic acid methyl esters on silica with hexane - ether 9:1. TLC of methyl esters of conjugated dienes on silica impregnated with 30% silver nitrate and toluene as developing solvent. All operations were performed under nitrogen and with minimum exposure to air. Visualization by exposure to iodine vapor or by spraying with sulfuric acid followed by charring at 100°C.

Chinese J. Chem. World (Huaxue Shijie) 34, 25-27 (1993). TLC of roxithromycin on silica with dichloromethane - acetone - aqueous NH3 45:5:1, and dichloromethane - acetone - petrol ether - methanol - aqueous NH3 42:6:5:2:1. Detection by spraying with a cerium sulfate - sodium molybdate solution. Quantification by densitometry at 610 nm.

J. Chin. Trad. Med. (Zhogguo Zhongyao Zazhi) 17, 491-492(1992). TLC of arecoline on silica with chloroform - methanol - NH3 240:5:4. Quantification by densitometry at 214 nm. C.V. 1.95%.

J. Planar Chromatogr. 6, 70-73 (1993). TLC of non-ionic surfactants (e.g. nonylphenyl ethylene oxide oligomers) according to the length of the ethylene oxide chain on aluminum oxide with chloroform - acetonitrile mixtures. The optimum separation of pairs of surfactant oligomers with the longest ethylene oxide chains required eluents of the highest strength (highest acetonitrile concentration).

J. Chromatogr. 623, 403-407 (1992) TLC of methyl ester of polyunsaturated fatty acids (PUFAS) on silver nitrate - impregnated silica with toluene - acetonitrile 97:3. Detection by spraying with 3% copper acetate - 8% orthophosphoric acid in water and heating at 180 °C for 20 min. quantification by autoradiography. The technique is particularly useful for metabolic studies of the chain elongation.

J. Planar Chromatogr. 6, 208-211 (1993). HPTLC of tylosin and erythromycin on silica with ethyl acetate - acetic acid 7:3 and - after drying - with ethyl acetate - acetic acid - water 6:2:2. Detection of tylosin under UV 254 nm, of erythromycin after dipping in a solution of anisaldehyde (1 mL in 100 mL acetic acid + 2 mL conc sulfuric acid). Quantification by densitometry.