Two recently developed surface plasmon resonance biosensor assays for detection of β-lactams in milk were used to screen raw producer milk samples. Both assays use a β-lactam receptor protein with carboxypeptidase activity for detection. The results of the biosensor assays
were compared with those of various commercial screening tests, i.e., the Delvotest SP, Penzym S, Beta-STAR, SNAP, and Parallux. The results of the 2 biosensor assays showed good agreement with those of the other screening tests. Of 195 analyzed milk samples, the results of only 5 samples
differed between the assays. Additionally, 30 milk samples with both negative and positive results in the screening assays were analyzed by liquid chromatography for identification and quantification of any β-lactam residues. All screening tests showed 0% false-negative results with 15
incurred samples containing between 4.0 and 268 μg/kg penicillin G. The biosensor assays showed 27% positive results (false violatives) with 15 producer milk samples containing penicillin G concentrations between 0 and 3.6 μg/kg, i.e., below maximum residue limit. This figure varied
between 27 and 53% for the other screening tests.
Document Type: Research Article
Swedish University of Agricultural Sciences, Department of Food Science, PO Box 7051, 750 07 Uppsala, Sweden
Publication date: May 1, 2004
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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 The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better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.