Abstract
The retention behavior of nickel and vanadyl metalloporphyrins in reversed-phase high-performance liquid chromatography has been studied. Water or strong bases added to the otherwise non-aqueous mobile phase systems were found to enhance the separation of nickel metalloporphyrin homologues and the separation of vanadyl and nickel species. Differences in the retention shifts caused by the addition of water and strong bases to the mobile phase demonstrate two chromatographic variables: polarity and ligand coordination. A mixture of the octaethylporphyrins of zinc (II), nickel (II), copper (II), and cobalt (II) and the etioporphyrin-I of vanadium and nickel were separated with acetonitrile-ethanolamine (10:1) as the mobile phase.
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