Journal
FOOD CHEMISTRY
Volume 241, Issue -, Pages 268-274Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2017.08.113
Keywords
3D hierarchical magnetic hollow sphere-like; CuFe2O4; Sudan dyes; Magnetic solid-phase extraction; Preserved bean curd
Funding
- National Nature Science Foundation of China [NSFC21707061, 51672116]
- 123 Project of China Environmental Protection Foundation [CEPF2013-123-1-1]
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Three-dimensional (3D) hierarchical magnetic hollow sphere-like CuFe2O4 (3D HMHS-CuFe2O4) were designed to sensitively detect four Sudan dyes combined with HPLC-DAD. The formation mechanism of 3D HMHSCuFe2O4 is also discussed. Compared to the particle-like CuFe2O4 (PL-CuFe2O4), the as-obtained 3D HMHSCuFe2O4 provided a higher extraction efficiency for the four Sudan dyes (I, II, III and IV) due to its hierarchical hollow structure with properly interconnected pores where the targets can easily diffuse into the reaction sites. Thus, a magnetic solid-phase extraction (MSPE)-HPLC method was established for the simultaneous measurement of the four Sudan dyes. Under optimized conditions, good linearity (5-4000 ng g(-1), r(2) >= 0.9991), limits of detection (LODs, 0.56-0.60 ng g(-1)), recoveries (91.1%-99.3%) and precision (RSDs <= 4.9%) for the four Sudan dyes were obtained. The proposed MSPE-HPLC-DAD method is a convenient, effective, sensitive and timesaving method for the rapid isolation and determination of four Sudan dyes in preserved bean curd.
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