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- W2056287480 abstract "Macrocyclic polyamines, or in particular dioxopolyamines, are strong receptors for analytes such as metal ions, catechol and catecholamine derivatives. In this paper, based on their interaction with a dioxopolyamine compound: 1,4,7,10-tetraazacyclotridecane-11,13-dione (or dioxo[13]aneN4), we report its use as an additive in capillary electrophoresis (CE) to improve the separation resolution and selectivity of various model analytes. Using an imidazole–acetic acid electrolyte with dioxo[13]aneN4 as the only additive, alkali metal, alkaline earth metal and NH4+ ions can be effectively separated and detected by using CE with indirect UV detection, as opposed to the use of crown ether in which another additive, such as α-hydroxyisobutyric acid, is needed. The host–guest interaction between dioxo[13]aneN4 and metal and NH4+ ions can modify their electrophoretic mobilities, and therefore can be used to differentiate the various cations, especially between K+ and NH4+, and between Sr2+ and Ca2+. We have also found that dioxo[13]aneN4 is an effective additive in CE to resolve nitrophenols and, in particular, dihydroxybenzenes. Moreover, unlike previous reports, the separation of various biogenic monoamine neurotransmitters can be achieved at neutral or physiological pH. This work demonstrates that one of the macrocyclic dioxopolyamine derivatives: dioxo[13]aneN4 is a promising additive in CE separations for any chemical species: cationic, anionic and neutral." @default.
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- W2056287480 date "1999-06-01" @default.
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- W2056287480 title "Capillary electrophoretic separation enhanced by a macrocyclic dioxopolyamine additive" @default.
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- W2056287480 doi "https://doi.org/10.1016/s0021-9673(99)00377-5" @default.
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