Analysis of Cefradine

Importance of the topic

Cephalosporin antibiotics, including cefradine and cephalexin, are widely used to combat bacterial infections. Accurate quantification of these compounds is essential for ensuring drug quality, patient safety, and compliance with regulatory standards.

Objectives and overview of the study

This application note describes the development and optimization of a reversed-phase liquid chromatography method for the simultaneous analysis of cefradine and cephalexin. The goal was to achieve clear separation, reliable detection, and quantification using a Shim-pack GIST C18 column.

Methods and methodology

Chromatographic separation was performed on a Shim-pack GIST C18 column (150 mm × 4.6 mm I.D., 3 μm) maintained at 40 °C. The mobile phase consisted of four components: water (A), methanol (B), 3.86 % sodium acetate solution (C), and 4 % acetic acid (D) mixed in the ratio A : B : C : D = 1564 : 400 : 3 : 6. The flow rate was set to 0.7 mL/min and the injection volume to 10 µL. Detection was carried out with a UV detector at 254 nm.

Instrumentation

• Shimadzu liquid chromatography system with UV detector (254 nm)
• Shim-pack GIST C18 column (150 mm × 4.6 mm I.D., 3 μm)
• Shimadzu LabTotal vials for LC/LCMS

Main results and discussion

The method provided baseline separation of cefradine and cephalexin, yielding well-resolved peaks with reproducible retention times. Chromatograms showed no significant interferences, demonstrating the method’s specificity and robustness for routine analysis.

Benefits and practical applications

• Rapid and reliable quantification of cephalosporin antibiotics in pharmaceutical samples
• High reproducibility and robustness suitable for QC laboratories
• Minimal sample preparation and straightforward method setup

Future trends and potential uses

Integration of mass spectrometric detection could enhance sensitivity and selectivity. Automated and high-throughput configurations may expand applications to environmental monitoring of antibiotic residues and analysis of other β-lactam compounds.

Conclusion

The developed reversed-phase LC method using Shim-pack GIST C18 column demonstrates efficient, robust, and reliable simultaneous determination of cefradine and cephalexin, supporting pharmaceutical quality control workflows.

References

• Shimadzu Corporation. Analysis of Cefradine. First Edition: March 2023, ERAS-1000-0068.