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- W2020367737 abstract "The basis of retention in reversed-phase ion-pair chromatography is examined using C18, C10 and C12 alkyl sulphates as hetaerons (pairing species) with a range of cations, neutrals, zwitterions and anions as solutes. The basic eluent comprises water—methanol (80:20) containing 20mM phosphate buffer pH 6.00 and 50mM sodium ion. Measurements were made of k′ (column capacity ratio) as a function of hetaeron concentration in the mobile (Cm) and stationary phases (C5) the latter being determined by the break-through method. While the adsorption isotherms were non-linear, plots of k′ versus surface concentration of hetaerons were essentially linear for cations up to a level at which the hetaeron formed micelles in the eluent whereupon k′ declined. k′ for neutrals fell slightly as C5 increased as did k′ for small zwitterions; k′ for anions fell drastically as C5 increased whereas small peptides behaved like cations. k′ values for all types at any given surface concentration (molar) were more or less independent of the chain length of the hetaeron. It is concluded that the degree of retention is directly related to the surface charge arising from the adsorbed hetaeron and that under most practical conditions ion-pair formation in the eluent is unimportant." @default.
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- W2020367737 title "Mechanism of ion-pair liquid chromatography of amines, neutrals, zwitterions and acids using anionic hetaerons" @default.
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- W2020367737 doi "https://doi.org/10.1016/s0021-9673(00)81633-7" @default.
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