Influence of the pore structure on the properties of silica based reversed phase packings for LC

Zoltan Szabó, R. Ohmacht, Christian W. Huck, Wolfgang M. Stöggl, Günther K. Bonn

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

This paper describes the preparation and investigation of new, highly loaded, monomeric, silica based, reversed phase C18 and C30 packings. The influence of pore structure and endcapping on the properties of C18 and C30 packings is described. Using hydrothermal procedures, silicas with predictable pore size (9.3 - 25.5 nm) and surface area have been prepared. Silylation with long chain silanes substantially alters the pore structure of the silica: pore size and pore volume decrease. A new parameter, the volumetric surface coverage [mm3 × m-2] has been introduced. This parameter - calculated from on-column measured porosity data - indicates the pore volume portion occupied by the hydrocarbon chains. Endcapping does not significantly change the pore structure of the bonded phases. The reduced retentions (reduced with respect to unit area: [k/m2]) - a good measure for comparing the retention behaviour of packings with different surface areas - are similar for most of the phases, demonstrating good accessibility of the pores for the solutes. Slightly lower retentions were found on the endcapped than on the non-endcapped phases for probes with dense π-electron system (e.g. polyaromatic hydrocarbons) demonstrating the contribution of silanophilic interactions to the retention. The phases had been successfully used for various demanding separations, e.g. for the separation of flavonoids, carotenoids, resveratrol, and tocopherol isomers, fullerenes, and anions.

Original languageEnglish
Pages (from-to)313-324
Number of pages12
JournalJournal of Separation Science
Volume28
Issue number4
DOIs
Publication statusPublished - Mar 2005

Fingerprint

Pore structure
Silicon Dioxide
Silica
Hydrocarbons
Pore size
Resveratrol
Fullerenes
Silanes
Flavonoids
Tocopherols
Porosity
Carotenoids
Isomers
Anions
Negative ions
Electrons

Keywords

  • Anions
  • Carotenoids
  • Fullerenes
  • Hydrothermal treatment of silica
  • Liquid chromatography
  • Micro-HPLC
  • Polyaromatic hydrocarbons
  • Pore structure
  • Resveratrol
  • Reversed phase C and C packings
  • Separation of flavonoids
  • Tocopherols

ASJC Scopus subject areas

  • Molecular Medicine
  • Clinical Biochemistry
  • Chemical Engineering(all)
  • Filtration and Separation

Cite this

Influence of the pore structure on the properties of silica based reversed phase packings for LC. / Szabó, Zoltan; Ohmacht, R.; Huck, Christian W.; Stöggl, Wolfgang M.; Bonn, Günther K.

In: Journal of Separation Science, Vol. 28, No. 4, 03.2005, p. 313-324.

Research output: Contribution to journalArticle

Szabó, Zoltan ; Ohmacht, R. ; Huck, Christian W. ; Stöggl, Wolfgang M. ; Bonn, Günther K. / Influence of the pore structure on the properties of silica based reversed phase packings for LC. In: Journal of Separation Science. 2005 ; Vol. 28, No. 4. pp. 313-324.
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