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Related Experiment Videos

Experiences with an identification and quantification program for inhibitor-positive milk samples.

Claudia Kress1, Caroline Seidler, Bianca Kerp

  • 1Dairy Sciences, Institute of Veterinary Food Science, Justus-Liebig-University, Ludwigstr. 21, 35390 Giessen, Germany.

Analytica Chimica Acta
|March 28, 2007
PubMed
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Beta-lactam antibiotics, primarily penicillin G, are the main cause of violative milk samples in Germany. Further analysis helps identify specific antimicrobial drugs in milk, aiding producers in quality control.

Area of Science:

  • Veterinary Pharmacology
  • Food Safety
  • Dairy Science

Background:

  • Beta-lactam antibiotics are widely used in German dairy cows.
  • Routine milk testing identifies antibiotic residues but not specific agents.
  • Identifying specific drug residues is crucial for addressing non-compliance and improper use.

Purpose of the Study:

  • To identify and quantify antimicrobial inhibitors in violative milk samples.
  • To determine the prevalence of different antibiotic classes in milk.
  • To support milk producers in quality assurance and regulatory compliance.

Main Methods:

  • Utilized a panel of microbiological inhibitor tests, receptor tests, and enzyme immunoassays (EIA).
  • Focused on detecting beta-lactam antibiotics, alongside sulfonamides and tetracyclines.

Related Experiment Videos

  • Analyzed 63 violative milk samples collected between 2003 and 2005.

    • Main Results:

    • Beta-lactam antibiotics were identified in 95% of samples.
    • Penicillin G was the predominant inhibitor, found in 74.6% of samples, often with metabolites.
    • Other identified compounds included ceftiofur (11%), ampicillin/amoxicillin (6.3%), isoxazolyl penicillins (3.2%), and sulfonamides (1.6%).

    Conclusions:

    • Penicillin G remains the primary antibiotic responsible for violative bulk tank milk in Germany.
    • The analytical approach effectively identifies specific beta-lactams and other antimicrobial residues.
    • Accurate identification of drug residues aids in managing milk quality and addressing regulatory issues.