Analysis of CefemAntibiotics

Significance of the Topic

The accurate and simultaneous analysis of β-lactam antibiotics, particularly cephalosporins, is essential in pharmaceutical quality control, clinical diagnostics and environmental monitoring. Reliable separation and quantification ensure drug safety, efficacy and compliance with regulatory standards.

Study Objectives and Overview

This application note presents the development of a reversed-phase HPLC method for the simultaneous separation and determination of 13 cephalosporin antibiotics. Two Shimadzu Shim-pack columns, VP-ODS and XR-ODS II, were evaluated to compare resolution, analysis time and throughput.

Methodology and Instrumentation

The method was implemented on a Shimadzu Nexera-i system using:

• Shim-pack VP-ODS column (250 mm × 4.6 mm I.D., 5 μm)
• Shim-pack XR-ODS II column (150 mm × 3.0 mm I.D., 2.2 μm)

Mobile phases comprised 0.1% formic acid in water (A) and acetonitrile (B). Gradient programs were:

• VP-ODS: 15% B to 55% B over 35 min, then return to 15% B by 50 min
• XR-ODS II: 15% B to 55% B over 6.95 min, then return to 15% B by 10 min

Flow rates were 0.7 mL/min (VP-ODS) and 0.9 mL/min (XR-ODS II) at 40 °C. Injection volumes were 5 μL and 2 μL, respectively. Detection was performed with an LC-2040C 3D UV detector at 260 nm using a high-speed, high-sensitivity flow cell.

Main Results and Discussion

Both column formats achieved baseline separation of all 13 antibiotics. The VP-ODS column provided high resolution within a 50-minute run time. The XR-ODS II column, with smaller particles and reduced length, delivered comparable resolution in just 10 minutes. Retention times were reproducible (RSD <1%), and linear calibration curves were obtained at 50 mg/L levels.

Benefits and Practical Applications

• High throughput screening in pharmaceutical QC laboratories
• Significant reduction in analysis time and solvent usage with XR-ODS II
• Applicable to routine monitoring of β-lactam residues in environmental and clinical samples

Future Trends and Opportunities

Advancements in sub-2 μm particle columns and UHPLC technology will further shorten run times and minimize waste. Integration with mass spectrometry detection will enhance sensitivity for trace-level analysis. Automated sampling and data processing workflows are set to improve productivity in high-volume testing environments.

Conclusion

The described HPLC methods using Shim-pack VP-ODS and XR-ODS II columns facilitate efficient, robust separation of multiple cephalosporin antibiotics. The XR-ODS II column is particularly suited for fast, high-throughput applications without compromising analytical performance.

Used Instrumentation

• Shimadzu Nexera-i LC system
• Shim-pack VP-ODS column (250 mm × 4.6 mm I.D., 5 μm)
• Shim-pack XR-ODS II column (150 mm × 3.0 mm I.D., 2.2 μm)
• LC-2040C 3D UV detector at 260 nm with high-speed high-sensitivity flow cell

References

Application News L475 (Shimadzu Corporation, 2021)