title: Development of a γ-alumina- nanoparticle-functionalized porous polymer monolith for the enrichment of Sudan dyes in red wine samples.
abstract: Monolithic materials were synthesized in capillaries by in situ polymerization with N-isopropylacrylamide, glycidyl methacrylate, and ethylene dimethacrylate as the monomers, and methanol and PEG as the porogens. With γ-alumina nanoparticles attached to the surface of the porous monolithic column via epoxide groups, a novel polymer monolith microextraction (PMME) material was prepared with a good mechanical stability and a high extraction capacity. SEM and X-ray photoelectron spectroscopy were employed to characterize the modified monolithic column, demonstrating that γ-alumina nanoparticles were effectively functionalized onto the monolithic column. In addition, a new method was developed for the analysis of Sudan I-IV dyes using PMME coupled with HPLC. In order to obtain the optimum extraction efficiency, the PMME conditions including desorption solvent type, sample pH, sample volume, sample flow rate, and eluent flow rate were investigated. Under the optimum conditions, we obtained acceptable linearities, low LODs, and good intra- and interday RDSs. When applied to the determination of Sudan I-IV dyes in red wine samples, satisfactory recoveries were obtained in the range of 84.0-115.9%.
authors: College of Chemistry, Jilin University, Changchun, China.
authors: Wanjun
authors: W
authors: Li
authors: Xiao
authors: X
authors: Zhou
authors: Juanjuan
authors: J
authors: Ye
authors: Qiong
authors: Q
authors: Jia
mesh_terms: D001391:Azo Compounds / Q000737:chemistry / Q000302:isolation & purification*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification*; D005506:Food Contamination / Q000032:analysis*; D053758:Nanoparticles / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D014920:Wine / Q000032:analysis*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D011108:Polymers; C033003:sudan red
keywords: Microextraction; Nanoparticles; Polymer monoliths; Sudan dyes; γ-Alumina