Screening methods for the detection of antibiotic residues in slaughter animals: comparison of ther european union Four-Plate Test, the Nouws Antibiotic Test and the Premi Test (applied to muscle and kidney

Microbial growth inhibition tests are widely used as the primary screening approach for the detection of antibiotic residues in slaughter animals. In this study we evaluated and compared the performance of the European Union Four-Plate Test (EU4pt), the Nouws Antibiotic Test (NAT), and a commercial ampoule test, the Premi(R)Test (applied to both muscle and kidney), by parallel analysis of 735 slaughter animals. The EU4pt only showed significant inhibition with two muscle samples containing 305 mu g kg(-1) doxycycline and 648 mu g kg(-1) tulathromycin, while an maximum residue limit (MRL) violation of 1100 mu g kg(-1) sulfamethazine remained unnoticed. Premi(R)Test-muscle only detected the sulfamethazine containing sample, all other (1.1%) suspect samples appeared false-positive results. The same test applied to kidney yielded 4.1% suspect samples, while the NAT screening (based on analysis of renal pelvis fluid) showed 4.9% suspect results. The vast majority of these samples contained tetracycline and/or aminoglycoside residues. Premi(R)Test-kidney appeared to be more sensitive to aminoglycosides than the NAT screening, which failed to detect an MRL violation of 870 mu g kg(-1) gentamicin in kidney. Detection of less than MRL levels of tetracycline residues by the NAT proved its suitability for this residue group. Whether Premi(R)Test is sufficiently sensitive for accurate tetracycline detection in kidney remains doubtful, although changing over to kidney definitely improved the suitability of Premi(R)Test for the detection of residues in slaughter animals