Introduction
In addition to the common alkyl, phenyl, and cyano
stationary phases, there aremany newer stationary
phaseswithmore complex chemistries.
Many of these are based on alkyl chainswith some
secondary functionality added to aid selectivity.
Another approach for adjustment of selectivity is to
usemore than one stationary phase (i.emultiple
columns)with complimentary selectivity in order to
achieve better resolutionwith difficult separations.
