| Autor: |
Trammell BC; Department of Chemistry, University of Minnesota, Minneapolis 55455, USA., Ma L, Luo H, Jin D, Hillmyer MA, Carr PW |
| Jazyk: |
angličtina |
| Zdroj: |
Analytical chemistry [Anal Chem] 2002 Sep 15; Vol. 74 (18), pp. 4634-9. |
| DOI: |
10.1021/ac020206d |
| Abstrakt: |
A new type of silica-based stationary phase with dramatically improved acid stability compared to any currently available silica-based stationary phase has been developed. Superior low pH stability is achieved by first self-assembling a densely bonded monolayer of (chloromethyl)-phenylethyltrichlorosilane (CMPES). The self-assembly step is followed by a Friedel-Crafts cross-linking of the reactive moieties with their neighbors, by addition of secondary, cross-linkable aromatic reagents, or by both. This phase is not endcapped. Elemental analysis data shows that an aluminum chloride catalyst is very effective at bonding aromatic cross-linking reagents, such as styrene heptamer and triphenylmethane, to the reactive CMPES monolayer. The stability of the retention factor of decylbenzene on the cross-linked self-assembled CMPES phases is compared to a sterically protected C18 phase to illustrate its superior resistance to acid-catalyzed-phase loss. Inverse size exclusion chromatography and flow-curve comparisons of the cross-linked self-assembled CMPES and the sterically protected C18 stationary phases illustrate their similar chromatographic efficiency. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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