High Speed Analysis of Ibuprofen and Ibuprofen Related Compound

Importance of the Topic

Ibuprofen is a non-steroidal anti-inflammatory drug (NSAID) extensively used for its analgesic, anti-inflammatory and antipyretic effects. Rapid and reliable analysis of ibuprofen and related impurities is essential for quality control in pharmaceutical manufacturing and regulatory compliance. High-speed methods increase laboratory throughput and reduce analysis time without sacrificing accuracy.

Aims and Study Overview

This application note describes the development of a fast reversed-phase liquid chromatographic method for the simultaneous determination of ibuprofen, an internal standard (valerophenone), and a related impurity (4-isobutylacetophenone). The study focuses on achieving separation in under 10 minutes using Shimadzu’s Shim-pack GIST C18-HP column and Nexera Dual Injection System.

Methodology and Instrumentation

The method employs a high-efficiency C18 column and optimized mobile phase to achieve baseline resolution in a short run time.

• System: Nexera Dual Injection System
• Column: Shim-pack GIST C18-HP (75 mm × 3.0 mm I.D., 3 µm)
• Mobile phase: A) 1% (w/v) chloroacetic acid in water (pH 3.0); B) acetonitrile; ratio A/B = 1:1
• Flow rate: 1.0 mL/min
• Column temperature: 35 °C
• Injection volume: 1.0 µL
• Detection: UV at 254 nm (SPD-40 detector)

Main Results and Discussion

The optimized method achieved the following separation within 7 minutes:

• Peak 1: Ibuprofen eluting at ~2.6 minutes
• Peak 2: Valerophenone (internal standard) at ~4.0 minutes
• Peak 3: 4-Isobutylacetophenone at ~5.2 minutes

The chromatogram showed sharp, symmetric peaks with adequate resolution (>1.5) between all analytes. The fast analysis enabled baseline separation of impurity from the main drug peak, satisfying regulatory requirements.

Benefits and Practical Applications

The method offers several practical advantages:

• High throughput: Reduced run time increases sample capacity
• Robustness: Stable retention times and peak shapes under routine conditions
• Sensitivity: UV detection at 254 nm provides reliable quantification
• Versatility: Applicable to QC laboratories for batch release and stability testing

Future Trends and Possibilities

Future developments may include coupling this method with mass spectrometric detection for enhanced specificity, exploring ultra-high-pressure chromatography (UHPLC) to further reduce analysis time, and applying similar rapid protocols to other NSAIDs or multi-component dosage forms. Integration with automated sample preparation systems could also streamline workflows.

Conclusion

The proposed LC method using the Shim-pack GIST C18-HP column on a Nexera Dual Injection System enables fast, accurate determination of ibuprofen and a key impurity. It meets the demands of modern pharmaceutical quality control by delivering high resolution, short analysis times, and robust performance.

Reference

• Application News 01-00129 (JP), Shimadzu Corporation, First Edition: Dec. 2021