title: Retention behavior of phenoxyacetic herbicides on a molecularly imprinted polymer with phenoxyacetic acid as a dummy template molecule.
abstract: Molecular imprinted polymers (MIPs) binding with phenoxyacetic acid (PA) as a dummy template molecule were synthesized via thermal initiation in aqueous medium. The retention behaviors of benzoic acid (BA), PA, 2-methyl-4-chlorophenoxyacetic acid (MCPA), 4-chlorophenoxyacetic acid (4-CPA), and 2,4-dichlorophenoxyacetic acid (2,4-D) on this MIP column indicate that this material can selectively retain phenoxyacetic herbicides. To investigate these recognition mechanisms, the interactions between the functional monomer 4-vinylpyridine (4-VP) and PA or 2,4-D were investigated by computational modeling. (1)H NMR spectroscopy of 2,4-D titrated by 4-VP was recorded. The chemical shift of the 2,4-D acidic proton (12.15-14.32ppm) shows the existence of the ion-pair interaction. This kind of polymers could be useful as stationary phases to extract 2,4-D, 4-CPA or MCPA and avoid leakage of a trace amount of target analyte remaining in the MIPs.
authors.affiliation: Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100094, China.
authors.forename: Huiting
authors.initials: H
authors.lastname: Zhang
authors.forename: Tao
authors.initials: T
authors.lastname: Song
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Hua
authors.forename: Canping
authors.initials: C
authors.lastname: Pan
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry; D008456:2-Methyl-4-chlorophenoxyacetic Acid / Q000737:chemistry; D000085:Acetates / Q000737:chemistry*; D019817:Benzoic Acid / Q000737:chemistry; D001665:Binding Sites; D002151:Calorimetry; D002851:Chromatography, High Pressure Liquid; D039301:Computers, Molecular; D006540:Herbicides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D008968:Molecular Conformation; D018716:Molecular Mimicry; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry; D012997:Solvents; D013237:Stereoisomerism; D013816:Thermodynamics; D014867:Water
chemical_list: D000085:Acetates; D006540:Herbicides; D011108:Polymers; D011725:Pyridines; D012997:Solvents; D014867:Water; D015084:2,4-Dichlorophenoxyacetic Acid; D019817:Benzoic Acid; D008456:2-Methyl-4-chlorophenoxyacetic Acid; C029351:4-vinylpyridine; C415326:phenoxyacetic acid