title: A molecularly imprinted organic-inorganic hybrid monolithic column for the selective extraction and HPLC determination of isoprocarb residues in rice.
abstract: An IPC-imprinted (IPC is isoprocarb) poly(methacrylic acid)/SiO2 hybrid monolithic column was prepared and applied for the recognition of the template. The hybrid monolithic column was synthesized in a micropipette tip using methyltrimethoxysilane as the inorganic precursor, 3-(methacryloxy)propyltrimethoxysilane as the coupling agent, and ethylene glycol dimethacrylate as the cross-linker. The synthesis conditions, including the porogenic solvent, coupling agent, volume ratio of the inorganic alcoholysate and organic part, were optimized. The prepared monolithic column was characterized by SEM and FTIR spectroscopy. A simple, rapid, and sensitive method for the determination of IPC in rice using the imprinted monolithic column microextraction combined with HPLC was developed. Several parameters affecting the sample pretreatment were investigated, including the eluent, washing solution, and loading sample volume. The linearity of the calibration curve was observed in the range of 9.0-1000 μg/kg for IPC in rice with the correlation coefficient (r2) of 0.9983. The LOD was 3.0 μg/kg (S/N = 3). The assay gave recovery values ranging from 91 to 107%. The proposed method has been successfully applied for the selective extraction and sensitive determination of IPC in rice and a satisfactory result was obtained.
authors.affiliation: Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Hubei University, Wuhan, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Yang
authors.forename: Chao
authors.initials: C
authors.lastname: Ma
authors.forename: Huaixia
authors.initials: H
authors.lastname: Chen
authors.forename: Yajie
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xueping
authors.initials: X
authors.lastname: Dang
authors.forename: Jianlin
authors.initials: J
authors.lastname: Huang
mesh_terms: D002219:Carbamates / Q000032:analysis* / Q000302:isolation & purification*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005506:Food Contamination / Q000032:analysis; D007306:Insecticides / Q000032:analysis* / Q000302:isolation & purification*; D054802:Molecular Imprinting; D012275:Oryza / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*
chemical_list: D002219:Carbamates; D007306:Insecticides; D011108:Polymers; C065256:isoprocarb
keywords: Hybrid monolithic columns; Isoprocarb; Molecularly imprinted polymers; Rice