Q&A May 2006 www.thecolumn.eu.com The Column Figure 1: Interconnection
regions of graphitic ribbons in PGC. Figure 2: Schematic representation of
a polarized solute approaching a PGC surface. a Analyte with electron- a
Analyte with electron- donating properties withdrawing properties
approaching the graphite approaching the graphite surface surface
Electrons in the polarizable surface Electrons in the polarizable surface
of the graphite repelled away from of the graphite attracted towards a a
negative charge positive charge exceptional column lifetimes. Although the
chemical nature of PGC is different to most Figure 3: Porous graphitic
carbon can retain highly polar chromatographic materials, its physical
properties are similar to molecules. other HPLC supports and it is
manufactured using a silica template, to create spherical, porous
particles with 250
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Table of Contents for the Digital Edition of The Column - May 2006