A mode of capillary electrochromatography(CEC) based on the dynamical adsorption of an nonpolar monolithic stationary phases with a cationic surfactant, long chain quaternary ammonium slat of cetyltrimethylammonium br...A mode of capillary electrochromatography(CEC) based on the dynamical adsorption of an nonpolar monolithic stationary phases with a cationic surfactant, long chain quaternary ammonium slat of cetyltrimethylammonium bromide(CTAB) has been developed. The effects of pH value and the concentration of cetyltrimethylammonium bromide in mobile phase on electroosmotic mobility and the retention factors of solutes were investigated.展开更多
This paper covers the preparation of a sol gel derived macrocyclic dioxopolyamine(1,4,7,10 tetraazaclotridecane 11,13 dione) stationary phase for open tubular capillary electrochromatography(OTCEC). The sol gel derive...This paper covers the preparation of a sol gel derived macrocyclic dioxopolyamine(1,4,7,10 tetraazaclotridecane 11,13 dione) stationary phase for open tubular capillary electrochromatography(OTCEC). The sol gel derived macrocyclic dioxopolyamine capillary columns have shown improved separations of neurotransmitters, isomeric nitrophenols, isomeric dihydroxybenzenes, isomeric aminophenols, isomeric diaminobenzenes and three ortho halogen anilines, in comparison with those of untreated capillaries. The characteristics of the sol gel derived macrocyclic dioxopolyamine capillary columns are compared with the capillary column modified with the macrocyclic dioxopolyamine by chemically bonded method after etching. The sol gel method provided a porous silica material with stationary phase in place within the same experimental procedure. This provided speedy fabrications of high efficiency columns with high surface area and improved phase ratio. We achieved high efficiencies of 60 000-340 000 plates/m for the various isomeric compounds. The reproducibility migration time and the plate number were pretty good.展开更多
文摘A mode of capillary electrochromatography(CEC) based on the dynamical adsorption of an nonpolar monolithic stationary phases with a cationic surfactant, long chain quaternary ammonium slat of cetyltrimethylammonium bromide(CTAB) has been developed. The effects of pH value and the concentration of cetyltrimethylammonium bromide in mobile phase on electroosmotic mobility and the retention factors of solutes were investigated.
文摘This paper covers the preparation of a sol gel derived macrocyclic dioxopolyamine(1,4,7,10 tetraazaclotridecane 11,13 dione) stationary phase for open tubular capillary electrochromatography(OTCEC). The sol gel derived macrocyclic dioxopolyamine capillary columns have shown improved separations of neurotransmitters, isomeric nitrophenols, isomeric dihydroxybenzenes, isomeric aminophenols, isomeric diaminobenzenes and three ortho halogen anilines, in comparison with those of untreated capillaries. The characteristics of the sol gel derived macrocyclic dioxopolyamine capillary columns are compared with the capillary column modified with the macrocyclic dioxopolyamine by chemically bonded method after etching. The sol gel method provided a porous silica material with stationary phase in place within the same experimental procedure. This provided speedy fabrications of high efficiency columns with high surface area and improved phase ratio. We achieved high efficiencies of 60 000-340 000 plates/m for the various isomeric compounds. The reproducibility migration time and the plate number were pretty good.
