title: Comparison of binding behavior for molecularly imprinted polymers prepared by hierarchical imprinting or Pickering emulsion polymerization.
abstract: The aim of this study was the evaluation of the binding performances and selectivity of molecularly imprinted beads prepared toward several penicillins (i) by hierarchical bulk polymerization in the pores of template-grafted silica microbeads (hMIPs) and (ii) by Pickering emulsion polymerization in the presence of template-decorated silica nanobeads (pMIPs). 6-Aminopenicillanic acid was chosen as the common fragmental mimic template. Both approaches produced micron-sized polymeric beads with good recognition properties toward the target ligands whereas the selectivity pattern appeared quite different. The polymer prepared by the Pickering emulsion approach showed binding properties similar to imprinted beads prepared by hierarchical approach. Equilibrium binding constants changed their values from 0.1-0.2 × 10(6) (hMIPs) to 0.2-0.6 × 10(6) M(-1) (pMIPs), while the binding site densities changed from 3.7-4.8 (hMIPs) to 0.3-0.55 μmol/g (pMIPs). Compared to the hierarchical polymerization, Pickering emulsion polymerization represents a more practical approach when a template mimic needs to be used.
authors.affiliation: Department of Chemistry, University of Torino, via Giuria 5, Torino, Italy.
authors.forename: Cristina
authors.initials: C
authors.lastname: Giovannoli
authors.affiliation: Department of Chemistry, University of Torino, via Giuria 5, Torino, Italy.
authors.forename: Cinzia
authors.initials: C
authors.lastname: Passini
authors.affiliation: Department of Chemistry, University of Torino, via Giuria 5, Torino, Italy.
authors.forename: Laura
authors.initials: L
authors.lastname: Anfossi
authors.affiliation: Department of Chemistry, University of Torino, via Giuria 5, Torino, Italy.
authors.forename: Fabio Di
authors.initials: FD
authors.lastname: Nardo
authors.affiliation: Department of Chemistry, University of Torino, via Giuria 5, Torino, Italy.
authors.forename: Giulia
authors.initials: G
authors.lastname: Spano
authors.affiliation: Department of Chemistry, University of Torino, via Giuria 5, Torino, Italy.
authors.forename: Valter
authors.initials: V
authors.lastname: Maurino
authors.affiliation: Department of Chemistry, University of Torino, via Giuria 5, Torino, Italy.
authors.forename: Claudio
authors.initials: C
authors.lastname: Baggiani
keywords: Hierarchical imprinting; Mimic template; Molecular imprinting; Penicillins; Pickering emulsion