title: Molecularly imprinted microspheres as SPE sorbent for selective extraction of four Sudan dyes in catsup products.
abstract: A highly selective molecularly imprinted solid-phase extraction (MISPE) coupled with high performance liquid chromatography (HPLC) ultraviolet-visible detection was developed for the simultaneous isolation and determination of four Sudan dyes (I, II, III and IV) in catsup products. The novel molecularly imprinted microspheres (MIM) were synthesized by aqueous suspension polymerization using phenylamine and naphthol as template, which showed high affinity to Sudan dyes in aqueous solution. In order to develop a selective extraction protocol for simultaneous determination the four Sudan dyes from catsup products, the molecular recognition properties of MIM as a SPE sorbent were evaluated. Under the optimized condition, good linearity was obtained from 0.01 to 2.5 μg g(-1) (r(2)≥ 0.9990) with the relative standard deviations of less than 3.4%. This proposed MISPE-HPLC procedure eliminated the effect of template leakage on quantitative analysis and could be applied to direct determination of four Sudan dyes in complicated food samples.
authors: College of Pharmaceutical Sciences, Hebei University, Baoding 071002, China. qiaofengxia@126.com
authors: Fengxia
authors: F
authors: Qiao
authors: Yuru
authors: Y
authors: Geng
authors: Changqing
authors: C
authors: He
authors: Yupei
authors: Y
authors: Wu
authors: Pengyu
authors: P
authors: Pan
mesh_terms: D001391:Azo Compounds / Q000737:chemistry / Q000302:isolation & purification*; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification*; D003212:Condiments / Q000032:analysis*; D005504:Food Analysis / Q000379:methods; D016014:Linear Models; D008863:Microspheres; D054802:Molecular Imprinting / Q000379:methods*; D009284:Naphthols / Q000737:chemistry / Q000302:isolation & purification; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000379:methods*; D012997:Solvents / Q000737:chemistry
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D009284:Naphthols; D012997:Solvents; C024336:1-phenylazo-2-naphthol