The separation of stereoisomers from oligomers of low molecular weight polystyrene on a carbon clad zirconia column using a reversed phase multidimensional HPLC system

The two dimensional separation of low molecular weight polystyrene oligomer s and stereoisomers was achieved using a liquid chromatographic system desi gned for 'heart-cutting' multidimensional chromatography. The first separat ion process incorporated a C18 column and a methanol mobile phase to separa te the oligomers, whilst the second separation process utilised the change in selectivity associated with a carbon clad zirconia stationary phase and an acetonitrile mobile phase for the separation of the isomers. The two dim ensional separation that was achieved using this automated system was compa rable to the individual separations following manual sample manipulation in each individual separation step. Furthermore, the multidimensional LC syst em was shown to be highly reproducible in routine continuous operation over an eight hour period.