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Synthesis of a Molecularly Imprinted Polymer for Melamine Analysis in Milk by HPLC with Diode Array Detection

Title
Synthesis of a Molecularly Imprinted Polymer for Melamine Analysis in Milk by HPLC with Diode Array Detection
Type
Article in International Scientific Journal
Year
2015
Authors
Leandro Figueiredo
(Author)
FEUP
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Lúcia Santos
(Author)
FEUP
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Journal
Vol. 34 No. 4
Pages: 21506-21512
ISSN: 0730-6679
Publisher: Wiley-Blackwell
Indexing
Publicação em ISI Web of Science ISI Web of Science
INSPEC
Scientific classification
FOS: Engineering and technology
CORDIS: Technological sciences
Other information
Authenticus ID: P-00G-MZJ
Abstract (EN): A molecularly imprinted polymer (MIP) for melamine was prepared by suspension polymerization, using melamine as a template, methacrylic acid as a functional monomer, and ethylene glycol dimethacrylate as a cross-linker. The optimal template/monomer and monomer/cross-linker ratios were obtained, being defined as 1/15 and 1/12, respectively. Molecular recognition properties and binding capacity toward melamine were evaluated by adsorption tests. Compared with the nonimprinted polymer, theimprinted polymer showed higher affinity for melamine with a dissociation constant (K-d) and a maximum binding concentration of 568.4 +/- 7.4 mol/L and 96.8 +/- 2.3 mol/g, respectively. Under optimal conditions, the imprinted polymer was used as a dispersive extraction sorbent to extract melamine from different milk samples, before high performance liquid chromatography with diode array detection (HPLC-DAD) analysis. The validated method presented a limit of detection of 0.6 mg/kg. From the analysis of six different milks, melamine was detected in two of the considered samples at a maximum concentration of 9.3 +/- 0.3 mg/kg.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 7
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