Molecular Imprinting by 4-Hydroxybenzoic Acid: A Two-Site Model

Author: Hu Lucy Yue   Orwoll Robert  

Publisher: Taylor & Francis Ltd

ISSN: 0149-6395

Source: Separation Science and Technology, Vol.45, Iss.16, 2010-11, pp. : 2337-2344

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

4-Hydroxybenzoic acid (4HBA) imprinted polymer was synthesized with the functional monomer, acrylamide, and the crosslinking agent, ethylene glycol dimethacrylate, in acetonitrile. Hydrogen bonding between the template and the monomer not only controls the template molecules in and out of the binding sites, but also contributes to special binding sites in the resulting polymer resin. Batch analyses showed that the 4HBA-imprinted polymer has a special affinity for the para-substituted hydroxybenzoic acid, but not for its meta-substituted isomer (3HBA), nor for benzoic acid (BA). The binding behavior of 4HBA can be interpreted with a simple two-site model with one kind of site in the resin being special for 4HBA and the other kind being general with similar affinities for 4HBA, 3HBA, and BA. These general binding sites found in both the imprinted resin and the non-imprinted reference resin have greater affinity, but are less numerous than the sites unique to the imprinted resin.