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001-es BibID:	bibEBI00008442
Első szerző:	Török János
Cím:	Distribution of cationic ion-pairing reagents on thin-layers after continuous overpressured layer chromatography / János Török, Katalin Kovács-Hadady, Emil Mincsovics
Dátum:	1998
ISSN:	0021-9673
Megjegyzések:	Ion-pair HPLC separations on layers were modelled by using continuous overpressured layer chromatography (OPLC). As a first step, the distribution of several cationic ion-pairing reagents on the layer was studied. The mobile phase containing different quaternary ammonium salts, such as tetramethylammonium (TMA), tetrabutylammonium (TBA), cetyltrimethylammonium (CTMA) and trioctylmethylammonium (TOMA) halides was continuously pumped through the stationary phase at a pressure of 40 bar. The volume of the mobile phase varied between 4.5 to 67.5 cm3 which is equivalent to a 1 to 15 bed volume of the given silica-gel layer. The concentration of the reagents was measured after chromatography in ten samples of the stationary phase taken along the direction of the development. Silica F-gel and physically and chemically bonded reversed-phase layers (C18) were used. In some cases the effluents also were analyzed. With 0.05 M CTMA in 50% methanol-water mixture, the layers acted as 'spread out columns' and they could be conditioned after pumping through 22.5 cm3 mobile phase. This means that there was no concentration gradient on the layer and the remaining reagent quantities on the layer did not change with increasing volumes of the mobile phase. In some cases, the behaviour of TMA was different from that of CTMA.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Journal of Chromatography A. - 803 : 1-2 (1998), p. 235-239. -
További szerzők:	Hadady Katalin Mincsovics Emil
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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