Mixed capillary electrophoretic and reversed-phase electrochromatographic separation of 4- n-alkylbenzoic acids

The apparent electrophoretic mobilities of 4-alkylbenzoic acids with side chain lengths of greater than seven carbon atoms in bonded phase capillaries were anomalously high compared to shorter homologues. This was identified as resulting from their slower migration rates caused by interactions with...

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Bibliographic Details
Published in:Journal of Chromatography A 1998-05, Vol.805 (1), p.327-329
Main Authors: McKillop, Andrew G, Smith, Roger M, Rowe, Raymond C, Wren, Stephen A.C
Format: Article
Language:English
Subjects:
Alkylbenzoic acids
Analytical chemistry
Chemistry
Chromatographic methods and physical methods associated with chromatography
Exact sciences and technology
Other chromatographic methods
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Summary:The apparent electrophoretic mobilities of 4-alkylbenzoic acids with side chain lengths of greater than seven carbon atoms in bonded phase capillaries were anomalously high compared to shorter homologues. This was identified as resulting from their slower migration rates caused by interactions with the wall of the column. The effect could be reduced by the addition of acetonitrile to the buffer solution suggesting a reversed-phase partitioning process. These compounds thus demonstrated a mixed electromigration and open-tubular reversed-phase electrochromatographic separation. However, because a relatively wide bore column was used, the efficiencies were poorer than previously reported for open-tubular electrochromatographic separations.
ISSN:0021-9673
DOI:10.1016/S0021-9673(98)00034-X