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- W2127536745 abstract "Abstract Chromatographic properties of silica‐, zirconia‐ and alumina‐based columns with octadecyl‐, polyethylene glycol‐ and pentafluorophenylpropyl‐bonded stationary phases were tested. Selectivities of nine columns for LC were characterized using chromatographic methods including Walters, Engelhardt, Tanaka and Galushko hydrophobicity and silanol activity tests, measurements of methylene selectivity in various aqueous‐methanol and aqueous‐acetonitrile mobile phases and of gradient lipophilic capacity as a measure of the effect of the sample hydrophobicity on gradient‐elution separations. A semi‐empirical interaction indices model, assuming a predominant role of the solvophobic interactions of test compounds with different polarities, was compared with the linear free energy relationships approach taking into account selective polar interactions. The interaction indices model was applied to both non‐polar stationary phases bonded on silica, alumina and zirconia supports, and to the non‐modified adsorbents in the normal‐phase LC. The retention data of isomeric naphthalene disulfonic acids were used to compare the attractive and repulsive ionic interactions of the columns in purely aqueous mobile phases. The results of the hydrophobicity and polarity tests were consistent, and allowed column characterization and classification. Silanol activity was important with octadecyl silica columns, but was relatively insignificant with bonded polyethylene glycol and pentafluorophenylpropyl phases on silica gel support. Polar interactions with the alumina and zirconia support materials significantly affect the retention." @default.
- W2127536745 created "2016-06-24" @default.
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- W2127536745 date "2006-04-01" @default.
- W2127536745 modified "2023-09-27" @default.
- W2127536745 title "Retention and selectivity tests of silica‐based and metal‐oxide bonded stationary phases for RP‐HPLC" @default.
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- W2127536745 doi "https://doi.org/10.1002/jssc.200500489" @default.
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