High-Speed Simultaneous Analysis of Amino Acids by Pre-column Derivatization Using Automatic Pretreatment Function

Significance of the Topic

Amino acid profiling is essential in pharmaceutical development, food science and biochemical research for quality control and nutritional assessment. Conventional post-column derivatization methods limit throughput due to extended reaction times and manual handling. Automated pre-column derivatization enhances speed, reproducibility and reduces reagent consumption.

Objectives and Study Overview

This study demonstrates the use of the Shimadzu Nexera XR HPLC system with an automatic pretreatment function to perform simultaneous analysis of 20 proteinogenic amino acids in a 26-minute cycle. Key performance metrics, including linearity, repeatability and real-sample applicability, are evaluated.

Methodology

Amino acids were derivatized in the autosampler needle using OPA for primary amines and FMOC for secondary amines. Separation was achieved on a Shim-pack XR-ODSII column (100 mm × 3.0 mm I.D., 2.2 µm) at 40 °C under a low-pressure gradient at 1.0 mL/min. Mobile phases included acetate buffers (pH 6 and pH 5 with EDTA) and water/acetonitrile. Detection employed fluorescence channels Ex 350/Em 450 nm for OPA derivatives and Ex 266/Em 305 nm for FMOC derivatives.

Used Instrumentation

• Shimadzu Nexera XR HPLC system with integrated automatic pretreatment
• RF-20AXS fluorescence detector
• Shim-pack XR-ODSII column (100 mm × 3.0 mm I.D., 2.2 µm)
• Autosampler with programmable derivatization workflows

Main Results and Discussion

Baseline separation of all 20 amino acids was achieved within 26 minutes. Calibration curves exhibited excellent linearity (r² ≥ 0.999) over 1–100 µmol/L. Repeatability at 25 µmol/L showed RSD values below 2% for most amino acids, with proline at approximately 4.9%. Analysis of a beer sample confirmed method robustness and minimal sample preparation requirements.

Benefits and Practical Applications of the Method

• High throughput for routine QA/QC workflows
• Minimized manual intervention and reagent use
• Improved reproducibility via controlled reaction timing
• Versatility for analytes beyond amino acids

Future Trends and Possibilities

Future developments may involve on-line coupling with mass spectrometry, microfluidic derivatization to further reduce volumes, expansion into metabolomics applications and advanced data automation to support high-throughput clinical and industrial analyses.

Conclusion

The Shimadzu Nexera XR platform with automated pre-column derivatization delivers a rapid, reliable and versatile solution for high-speed analysis of proteinogenic amino acids, reducing analysis time and variability while maintaining robust performance.

References

• Hakyakawa M. High-Speed Simultaneous Analysis of Amino Acids by Pre-column Derivatization Using Automatic Pretreatment Function. Shimadzu Application News 01-00441-EN; Sep. 2022.