Synthesis and characterization of magnetic-molecularly imprinted polymers for the HPLC-UV analysis of ametryn

• Published in: Reactive & functional polymers Vol. 122; pp. 175 - 182
• Main Authors: Khan, Sabir, Hussain, Sajjad, Wong, Ademar, Foguel, Marcos Vinicius, Moreira Gonçalves, Luís, Pividori Gurgo, Maria Isabel, Taboada Sotomayor, Maria del Pilar
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.01.2018; Elsevier BV
• Subjects: Adsorption; Analytical chemistry; Chemical synthesis; Computer simulation; Environmental analysis; Food analysis; Food quality; High performance liquid chromatography; Imprinted polymers; Iron oxides; Monomers; Nanoparticles; Pesticide; Pesticides; Tetraethyl orthosilicate; Analytical chemistry; Environmental analysis; Food quality; Pesticide; Food analysis
• ISSN: 1381-5148; 1873-166X
• DOI: 10.1016/j.reactfunctpolym.2017.11.002

Magnetic molecularly imprinted polymer (mag-MIP) were developed for the analysis of ametryn (4-N-ethyl-6-methylsulfanyl-2-N-propan-2-yl-1,3,5-triazine-2,4-diamine), a popular triazine herbicide. Iron oxide (Fe3O4) nanoparticles were synthetized, and then modified with tetraethoxysilane (TEOS) and 3-mercaptopropyltrimethoxysilane (MPS). Then MIPs' polymerimerization occurred in the nanoparticles' surface, using ethylene-glycol-dimethacrylate (EGDMA) as the building monomer, 2,2′-azobis(2-methylpropionitrile) (AIBN) as the radical initiator, and 2-vinylpyridine as the functional monomer. The functional monomer was previously chosen by computational simulation. The mag-MIPs' adsorption behavior well-fitted a Langmuir model (qm of 8.6mgg−1, KL of 5.2Lmg−1) and pseudo first order kinetics (k1 of 2.5×10−4s−1). The developed analytical methodology, using high-performance liquid chromatography with UV detection (HPLC-UV), showed suitable selectivity and had a limit of detection (LOD) and quantification (LOQ) of 25 and 82nmolL−1, respectively. [Display omitted] •For the first time, magnetic molecularly imprinted polymers (mag-MIPs) were synthetized for ametryn.•2-Vinylpyridine was chosen by computational simulation to be the functional monomer.•The mag-MIPs' adsorption behavior well-fitted a Langmuir model and pseudo first order kinetics.