Nitrofuran Antibiotics in Animal Feed on a Thermo Scientific™ Acclaim ™ 120 C18 Column

Importance of the Topic

Monitoring nitrofuran antibiotics in animal feed is critical due to their prohibited status in many regions and potential health risks. Accurate detection ensures regulatory compliance, protects public health, and maintains industry quality standards.

Study Objectives and Overview

R.J. McCracken and D.G. Kennedy aimed to develop a robust isocratic HPLC–DAD method to separate and quantify four common nitrofuran residues (nitrofurazone, nitrofurantoin, furazolidone, furaltadone) in complex animal feed matrices.

Methodology

Sample preparation involved:

• Weighing 3.0 g of feed into a centrifuge tube
• Adding 9 mL water, standing for 5 minutes
• Extracting with 21 mL methanol:acetonitrile (1:1) for 30 minutes
• Cleaning up on a neutral alumina cartridge (discard first 1.7 mL, collect next 3.5 mL)

Chromatographic separation used an Acclaim 120 C18 column (5 µm, 4.6 × 150 mm) at 30 °C with an isocratic mobile phase of acetonitrile and 10 mM ammonium acetate (pH 5.0) in a 20:80 v/v ratio. Flow rate was 1.0 mL/min, injection volume 20 µL, and detection by diode array at 365 nm (spectra 200–500 nm).

Used Instrumentation

• Thermo Scientific Dionex Summit P680A DGP-6 pump
• Dionex Summit ASI100 autosampler
• Dionex Summit UVD340U diode array detector
• Thermo Scientific Acclaim 120 C18 column (5 µm, 4.6 × 150 mm)

Main Results and Discussion

The method achieved complete baseline separation of all four nitrofurans within 12 minutes, even in the presence of feed matrix interferences. Recovery experiments at 5 and 20 mg/kg demonstrated satisfactory accuracy (recoveries within acceptance criteria) and precision. DAD spectral confirmation added specificity, verifying peak identity and purity.

Benefits and Practical Applications

• Rapid, reliable screening for illegal nitrofuran residues in animal feed
• High specificity through spectral confirmation
• Suitable for routine quality control and regulatory testing laboratories

Future Trends and Potential Applications

Advancements may include coupling with LC–MS/MS to achieve lower detection limits, automating sample preparation to increase throughput, and expanding to multi-residue antibiotic screening platforms for comprehensive feed safety analysis.

Conclusion

The Acclaim 120 C18-based HPLC–DAD method provides a fast, robust, and sensitive approach to detect banned nitrofuran antibiotics in animal feed, supporting regulatory compliance and safeguarding public health.

References

McCracken RJ, Kennedy DG. J Chromatogr A. 1997;771:349–354.