Laboratory Testing of the Charm Test II Receptor Assays and the Charm Farm Test with Tissues and Fluids from Hogs Fed Sulfamethazine, Chlortetracycline, and Penicillin G
The potentials of the Charm Test II receptor assays for the detection of residues of sulfonamides, tetracyclines, and β-lactams and the Charm Farm Test for screening for antimicrobial residues were tested. Market hogs were fed rations containing three times the label level of sulfamethazine,
chlortetracycline, and penicillin G for 2 weeks. Groups were killed after 0, 2, 4 and 8 days of withdrawal. Quantitative chemical methods were used to determine residue levels in fluids and tissues. Results were compared with those obtained using the qualitative Charm Test II receptor assays
and the Charm Farm Test antimicrobial inhibition assay. For the Charm Test II assays for sulfonamides, tetracyclines and β-lactams, respectively, 1.6, 5, and 6% of the results were false positive and 7, 5, and 0% were false negative, based on the limits of detection for the test kits
and the quantitative results. On a similar basis for the Charm Farm Test, 16% of the results were false positive (6 kidney, 4 muscle, and 6 urine samples) and 1% were false negative (sulfamethazine in one urine sample).
CHARM FARM TEST;
CHARM TEST II;
Document Type: Research Article
Health of Animals Laboratory, Agriculture Canada, 116 Veterinary Road, Saskatoon, Saskatchewan S7N 5E3, Canada
Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan S7N 5B4, Canada; College of Veterinary Medicine, North Carolina State University, 4700 Hillsborough Street, Raleigh,
North Carolina, 27606, U.S.A.
Publication date: February 1, 1996
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