Retention behaviors of polybutadiene-coated titania and comparison to bonded phase based on linear solvation energy relationships

The retention behaviors of polybutadiene-coated titania stationary phase (P BD-TiO2) are investigated by the use of linear solvation energy relationshi ps (LSERs) of 21 solutes. The logarithmic capacity factors measured on PBD- TiO2 (log k' (PBD-TiO2)) in a methanol-water (80:20, v/v) mobile versus the solutes' four interaction descriptors, the McGowan characteristic molar vo lume (V-x), dipolarity/polarizability (pi(2)*), effective or overall hydrog en bond donor acidity (Sigma alpha(2)(H)) and hydrogen bond acceptor basici ty (Sigma beta(2)(H)) are analyzed by multiple regression analysis and comp ared to conventional bonded reversed stationary phase. We find that PBD-TiO 2 is very similar to conventional bonded reversed stationary phase. The des criptors, V-x, pi(2)* and Sigma beta(2)(H) are the most important parameter s governing the retention, as they represent more than 96.62% of the log k' variation. Finally, we come to the conclusion that the retention of PBD-Ti O2 is a partition mechanism.