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- W2054963877 abstract "Chromatographic systems with silica dynamically modified with a series of hydrazine derivatives were studied as a possible alternative to those with chemically bonded stationary phases. The properties of these new systems were compared with those of conventional reversed-phase systems and systems containing silica dynamically modified by cetrimide. As in reversed-phase chromatography on chemically bonded alkylsilicas, solvophobic interactions seem to be the main factor responsible for retention. It is shown that dynamic modification of silica with reagents differing in chemical structure can lead to systems with different selectivity. Betaines and quaternary ammonium and hydrazinium compounds act similarly as modifiers of silica but are very different as ion-pairing agents. The results of experiments performed with modifiers of different hydrophobicity and at various pH values demonstrate that ionic binding is not only mechanism of immobilization on the silica surface. It is shown that the shape of peaks obtained for highly polar and basic solutes is usually better in dynamic modification chromatography than in reversed-phase chromatography on alkylsilicas. Examples of analytical separations of polyfunctional organic substances and some inorganic anions on dynamically modified silica are presented." @default.
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- W2054963877 date "1990-11-01" @default.
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- W2054963877 title "High-performance liquid chromatography on silica dynamically modified with hydrazinium derivatives" @default.
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- W2054963877 doi "https://doi.org/10.1016/0021-9673(90)85061-y" @default.
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