Column selectivity in reversed-phase liquid chromatography: V. Higher metal content (type-A) alkyl-silica columns

Jonathan J. Gilroy, John W. Dolan, P. W. Carr, Lloyd R. Snyder

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

Retention measurements involving 16 test solutes have been carried out for 38 type-A alkyl-silica columns and three bonded-zirconia columns. These measurements have been analyzed in terms of a model previously developed for type-B columns, so as to yield values of five column selectivity parameters (H, S*, A, B, C) for each type-A column. Overall differences in selectivity between type-A and -B columns can be related to the average values of H, S*, etc. for each column type. Compared to type-B columns, type-A columns provide generally stronger retention for carboxylic acids, while solutes that are more hydrophobic or less bulky are more retained on type-B columns. Hydrogen-bond acceptors (e.g. aliphatic amides) and cations (e.g. protonated bases) are strongly retained on type-A versus type-B columns. Compared to type-B columns, bonded-zirconia columns show much increased retention of cations and reduced retention of hydrogen-bond acceptors. Because of relatively large differences in the selectivity of bonded-zirconia, type-A, and type-B columns, it will prove difficult to find columns of different type (e.g. a type-A and a type-B column) which have equivalent selectivity. Type-A columns also tend to be more different from each other (in terms of selectivity) than is the case for type-B columns. As a result, the replacement of a given type-A column by an "equivalent" type-A column also appears unlikely, except for samples that do not contain ionized compounds.

Original languageEnglish (US)
Pages (from-to)77-89
Number of pages13
JournalJournal of Chromatography A
Volume1026
Issue number1-2
DOIs
StatePublished - Feb 13 2004

Keywords

  • Alkyl-silica column
  • Bonded-zirconia column
  • Column seletivity
  • LC
  • Selectivity
  • Stationary phases

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