Chinese Anal. Chem. (Fenxi Huaxue) 19, 1347-1351 (1991). Description of a simple device adapted both for continuous and stepwise gradient development with some application examples.

J. Planar Chromatogr. 8, 10-13 (1995). Description of an apparatus suitable for high pressure TLC. The functioning of the device is based on the principle of overpressured layer chromatography (OPLC). The apparatus consists of flat, ground stainless steel blocks, containing a water cushion system, mounted in a hydraulic press. Mylar film or stainless steel foil was employed as the water cushion membrane. With stainless steel foil leak-tightness was up to 500 bar. The performance of the apparatus was demonstrated by chromatography on a 20x20 cm TLC plate. A final pressure drop of 140 bar was recorded.

Rheum tunguticum Maxum ex Balt. Rheum Officinale Baill, and Huzhang, Polygouum Cuspdatum Siehet Zuce in Danning pills.) (Chinese). J. Chinese Trad. Patent Med. (Zhongchengyao) 17, (4), 16-18 (1995). TLC on silica with 1) petrol ether - hexane - ethyl formate - formic acid 10:30:15:1; 2) ethyl acetate - methanol - water 200:33:27. Detection under UV 254 nm. Study also by using separation - reaction - separation technique.

J. Planar Chromatogr. 11, 428-432 (1998). New TLC method HPTLC-OPLC and conventional TLC on silica gel with n-hexane - butyl acetate - ethyl acetate - chloroform 12:3:3:4; OPLC, and 6:3:3:4, TLC. Evaluation at 233 nm by densitometry. Development and validation of a quantitative OPLC purity test for phthaloyl-amlodipine and comparison of the validation characteristics (specificity characterized by retention factor, resolution, and asymmetry factors; linearity; detection limit and quantitation limit; and precision) with those of a similar TLC method.

J. Planar Chromatogr. 15, 320-323 (2002). Planar electrochromatography in the RP mode has been performed in a commercially available development chamber, which requires only small modification for this purpose. The report illustrates that good separation quality and good reproducibility can both be obtained by use of this apparatus. Only short migration distances - less than 4.0 cm - were obtained under the conditions used. Electrochromatography of benzamide, benzanilide, 17-a-acetoxyprogesterone, 2'-acetonaphthone, p-hydroxybenzoic acid, 3,4-dimethoxybenzoic acid, 4-pregnen-11b,17a,21-triol-3,30-dione and o-nitroaniline on RP-18 with 55% aqueous acetonitrile containing 25 mM acetate buffer (pH 4.5 before mixing with acetonitrile), and a potential of 1000 V, applied for 10 min. Densitometry at 254 nm in reflectance mode.

Proc. Ros. Acad. Sci. 399 (3), 362-365 (2004). Determination of colorants (rhodamine B, brilliant green and rhodamine G) on silica gel (sorbphil, Sorbpolymer, Russia) with ethanol (amperage 220 µA), ethanol and 0,01 % LiCl (475 µA), acetonitril - water 9:1 (430 µA), acetonitril - water 9:1 and 0,01 % LiCl (830 µA) or silica gel (Merck) with ethanol (amperage 240 µA), ethanol and 0,01 % LiCl (650 µA), acetonitril - water 9:1 (360 µA), acetonitril - water 9:1 and 0,01 % LiCl (950 µA). Frequently used voltage is 1 kV. All the plates are covered with polyethylene film to prevent evaporation of mobile phase.

J. Planar Chromatogr. 24, 113-115 (2011). TLC of dichlorvos on silica gel with cyclohexane - acetone - methanol 16:6:1. Detection by spraying with 2 % sodium hydroxide solution and subsequent spraying with 2 % thiobarbituric solution followed by heating at 90 °C for 10 min. The hRf of dichlorvos was 50. The limit of detection was approximately 18 µg/zone. Spectrophometric analysis of dichlorvos was performed by measuring the absorbance of the sample solution. The linearity was in the range of 50-350 µg/mL dichlorvos. On alkaline hydrolysis dichlorvos forms dimethylphosphoric acid and dichloroacetaldehyde; the latter reacts with 2-thiobarbituric acid to give a sharp pink spot. The reagent is selective for dichlorvos, and does not react with other organophosphorus, organochlorine, carbamate, and synthetic pyrethroid insecticides.

J. Chromatogr. 315, 401-403 (1984). Presentation of a sensitive reagent, sulphosalicylic acid, which is capable of detecting sugars in an amount as low as 0.2 mg on silica thin-layer plates.