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Multiresidue Analysis of Avermectins in Bovine Liver by Immunoaffinity Column Cleanup Procedure and Liquid Chromatography with Fluorescence Detector

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A multiresidue liquid chromatography (LC) method was developed to detect avermectin, ivermectin, doramectin, and eprinomectin simultaneously in bovine liver. The extracted samples were cleaned up by an immunoaffinity column, which was prepared by coupling anti-avermectin polyclonal antibody with CNBr-activated Sepharose 4B. The dynamic column capacities of avermectin, ivermectin, doramectin, and eprinomectin were 3531, 3542, 3543, and 3284 ng/mL gel, respectively. The eluate was evaporated to dryness, and residues were derivatized and determined by LC with fluorescence detector set at 365 nm excitation and 465 nm emission wavelengths. Recoveries ranged from 79.3 to 115.9% with coefficients of variation of 1.1–19.4% when avermectin, ivermectin, doramectin, and eprinomectin were spiked at levels of 5–100 ng/g. The limit of quantitation of the method was 2 ng/g for each drug.
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Document Type: Research Article

Affiliations: Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Beijing 100094, People's Republic of China.

Publication date: 2005-07-01

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  • The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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