A novel analytical method employing immunoaffinity column (IAC) clean-up coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for simultaneous determination of ractopamine, chloramphenicol, and zeranols (α-zearalanol, β-zearalanol, zearalanone, α-zearalenol, β-zearalenol, and zearalenone) in animal-originated foods. The sample was first digested by β-glucuronidase/sulfatase and then extracted with ethyl acetate-diethyl ether (9:1, v/v). The extracted solution was evaporated to dryness and then the residue was dissolved by 2 mL of 50% acetonitrile solution. After filtration, 1 mL filtrate was diluted to 10 mL with PBS. The reconstituted solution was cleaned up with immunoaffinity column and then analyzed by high performance liquid chromatography-tandem mass spectrometry (LC-MS/MS). The established method was shown to be sensitive efficient and reliable as indicated by the linearity (r2 ≥ 0.9994), precision (RSD ≤ 1.7%), average recovery (72.3–103.2%), and the limit of detection (0.05–0.10 μg/kg). The method can be used for determination of trace residues of ractopamine, chloramphenicol, and zeranols in animal-originated foods.
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Compliance with Ethical Standards
Conflict of Interest
Xue Sun declares that she has no conflict of interest. Qiang Tang declares that he has no conflict of interest. Xiaoli Du declares that she has no conflict of interest. Cunxian Xi declares that he has no conflict of interest. Bobin Tang declares that he has no conflict of interest. Guomin Wang declares that he has no conflict of interest. Hua Zhao declares that he has no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
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