Tetracyclines in Pork on a Thermo Scientific ™ Acclaim™ PolarAdvantage (PA) Column

Importance of the Topic

Effective monitoring of tetracycline antibiotics in pork is essential to ensure consumer safety, regulatory compliance and to prevent antibiotic resistance. Rapid, reliable analytical methods support quality control in the food industry and protect public health.

Objectives and Study Overview

This study demonstrates an HPLC method for separating and detecting four common tetracyclines in pork muscle. Using a Thermo Scientific™ Acclaim™ PolarAdvantage C18 column, the goal is to achieve baseline resolution and quantitation of oxytetracycline, tetracycline, chlortetracycline and doxycycline within a short runtime.

Methodology and Instrumentation

• Sample Preparation
  • 2.0 g pork muscle blended with 0.1 g citric acid, 1.0 mL 3.6 M HNO₃, 4.0 mL methanol and 1.0 mL water
  • Homogenization using mortar and pestle followed by centrifugation
• Chromatographic Conditions
  • Column: Thermo Scientific™ Dionex™ Acclaim™ PA C18, 5 µm, 4.6 × 150 mm
  • Pump: Dionex™ Summit P580 HPG/4
  • Mobile Phase A: 22 mM H₃PO₄, 0.5 mM Na₄P₂O₇; Phase B: acetonitrile
  • Gradient: 0–0.5 min at 82%A/18%B; linear to 45%A/55%B by 7.0 min
  • Flow Rate: 1.5 mL/min; Temperature: 30 °C; Injection Volume: 60 µL
  • Detector: UV at 360 nm (UVD 340U)
• Standards and Samples
  • Standard mix: 0.33 µg/mL tetracyclines in water
  • Spiked sample: 1.0 µg/g each antibiotic in pork
  • Control: unspiked pork

Main Results and Discussion

The method achieved clear separation of four tetracycline peaks within 7 minutes in the order oxytetracycline, tetracycline, chlortetracycline and doxycycline. Spiked recoveries were consistent and the control sample showed no interfering peaks. Peak shapes were symmetrical, indicating efficient interaction with the polar-embedded C18 column.

Benefits and Practical Applications

• Rapid analysis suitable for high-throughput laboratories
• Robust separation with minimal matrix interference
• Simple sample preparation using common reagents
• Applicability to routine food safety testing and regulatory screening

Future Trends and Applications

Advances may include coupling with mass spectrometric detection for enhanced sensitivity and selectivity, method extension to other food matrices, automation of sample preparation and miniaturized column formats to reduce solvent consumption.

Conclusion

This HPLC approach on an Acclaim PA C18 column offers a fast, reliable solution for quantifying tetracycline residues in pork. Its efficiency and ease of use make it ideal for routine monitoring in regulatory and industrial laboratories.

Reference

Farrington et al., Food Additives and Contaminants, 1991, Vol. 8, No. 1, pp. 55–64.