title: Poly(styrene-co-N-methacryloyl-l-phenylalanine methyl ester)-functionalized magnetic nanoparticles as sorbents for the analysis of sodium benzoate in beverages.
abstract: In this study, poly(styrene-co-N-methacryloyl-l-phenylalanine methyl ester)-functionalized magnetic nanoparticles were constructed and used as magnetic solid-phase extraction sorbents for analysis of food preservatives in beverages. To prepare the poly(amino acid)-based sorbents, N-methacryloyl-l-phenylalanine methyl ester, and styrene served as the functional monomers and modified onto the magnetic nanoparticles via free radical polymerization. Interestingly, compared with propylparaben and potassium sorbate, the proposed poly(amino acid)-based sorbents showed a good selectivity to sodium benzoate. The adsorption capacity of the sorbents to sodium benzoate was 6.08 ± 0.31 mg/g. Moreover, the fast adsorption equilibrium could be reached within 5 min. Further, the resultant poly(amino acid)-based sorbents were applied in the analysis of sodium benzoate in real beverage samples. The results proved that the proposed magnetic solid-phase extraction sorbents have a great potential for the analysis of preservatives in food samples.
authors.affiliation: College of Food Sciences and Engineering, Shandong Agricultural University, Tai'an, Shandong, P. R. China.|Beijing National Laboratory for Molecular Sciences, Key Lab of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, P. R. China.
authors.forename: Shilei
authors.initials: S
authors.lastname: Ji
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Key Lab of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, P. R. China.|University of Chinese Academy of Sciences, Beijing, China P. R. China.
authors.forename: Nan
authors.initials: N
authors.lastname: Li
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Key Lab of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, P. R. China.|University of Chinese Academy of Sciences, Beijing, China P. R. China.
authors.forename: Li
authors.initials: L
authors.lastname: Qi
authors.affiliation: College of Food Sciences and Engineering, Shandong Agricultural University, Tai'an, Shandong, P. R. China.
authors.forename: Minglin
authors.initials: M
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D001628:Beverages / Q000032:analysis*; D004952:Esters / Q000737:chemistry*; D005504:Food Analysis / Q000379:methods*; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D010649:Phenylalanine / Q000737:chemistry; D015203:Reproducibility of Results; D020160:Sodium Benzoate / Q000032:analysis*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*; D020058:Styrene / Q000737:chemistry
chemical_list: D004952:Esters; D058185:Magnetite Nanoparticles; D020058:Styrene; D010649:Phenylalanine; D020160:Sodium Benzoate
keywords: Beverages; Food preservatives; High-performance liquid chromatography; Magnetic solid-phase extraction; Sodium benzoate