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Preparation and evaluation of molecularly imprinted microspheres for solid-phase extraction of 1,4-hydroxybenzoic acid esters in soy

✍ Scribed by Juan He; Yanzheng Shen; Si Chen; Hongliang Wei; Jing Zhu; Liqin You; Kui Lu

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
205 KB
Volume
34
Category
Article
ISSN
1615-9306

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✦ Synopsis

Abstract

Molecularly imprinted microspheres (MIMs) were prepared by precipitation polymerization for the binding and recognition of 1,4‐hydroxybenzoic acid esters. Ethyl p‐hydroxybenzoate (EtPHB) was used as the template molecule, methacrylic acid as the functional monomer, ethylene dimethacrylate as the linking agent. It was evaluated by solid‐phase extraction column packed with MIMs combined with liquid chromatography to determine trace preservatives including benzoic acid, methyl p‐hydroxybenzoate, EtPHB, propyl p‐hydroxybenzoate in food products. A solid‐phase extraction based on MIM procedure was used to isolate four additives from the food matrix before quantitative analysis. The Scatchard plot suggested that the template–polymer system had two‐site binding behavior with the dissociation constants of 0.3577 and 3.952 mg/g, respectively. The rebinding test, based on the molecularly imprinted solid‐phase extraction column technique, showed the recoveries of soy samples spiked with four additives within 88.4–110.6%, with the relative standard deviations of 1.97–3.82%. Finally, the method was successfully applied for the analysis of parabens in foodstuff without traditional pretreatment.

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