Column screening for oligonucleotide analysis and quality control

Significance of the Topic

The accurate analysis of oligonucleotides underpins their development and quality control, particularly in therapeutic research accelerated by recent global health challenges. Robust chromatographic methods ensure high resolution, reproducibility and reliable quantification essential for both crude and purified nucleic acid products.

Objectives and Study Overview

This study compares the performance of two reversed-phase ion-pair (IP-RP) chromatography columns for oligonucleotide analysis. A 43-mer DNA full thiolate and a dT18 linker were examined in crude and purified forms to assess resolution, retention and purity outcomes across columns from KNAUER and Waters.

Methodology

All samples were prepared by BianoGMP following synthesis, cleavage and deprotection, then analyzed under identical IP-RP conditions with UV detection at 260 nm. Chromatograms of crude and purified oligonucleotides were overlaid to compare peak shape, retention time and shoulder resolution.

Used Instrumentation

• HPLC Columns:
  • KNAUER Sepapure® oliGO, 50 × 4.6 mm ID (Article No. 05EF18NSPG)
  • Waters XBridge™ BEH Oligonucleotide Column
• UV Detector set at 260 nm

Main Results and Discussion

• Both columns demonstrated nearly identical behaviour in terms of peak symmetry and overall resolution.
• The KNAUER column exhibited a marginally improved shoulder separation on the right side of the main peak, indicating slightly better resolution of closely eluting impurities.
• Small shifts in retention times were attributed to differences in stationary phase chemistry and pore/particle dimensions.
• Purity levels of both crude and final products were comparable, aligning with historical data from BianoGMP.

Benefits and Practical Applications

• KNAUER Sepapure oliGO offers a cost-effective alternative to established columns without compromising analytical performance.
• The demonstrated robustness under elevated temperatures and pH conditions ensures reliable routine QC of oligonucleotide therapeutics.
• High UV sensitivity at 260 nm allows straightforward quantification across a range of oligonucleotide lengths and modifications.

Future Trends and Potential Applications

Advances in column materials and surface chemistries will further enhance resolution of longer or highly modified oligonucleotides. Integration with mass spectrometry and automated gradient optimization could streamline method development. Emerging therapeutic modalities such as mRNA and CRISPR guide RNAs will benefit from tailored IP-RP protocols and next-generation stationary phases.

Conclusion

The comparative study confirms that the KNAUER Sepapure oliGO column matches or slightly exceeds the performance of a leading competitor for oligonucleotide analysis. Its stability and resolution make it a reliable choice for both research and GMP-driven quality control workflows.

Reference

The original article did not include external literature references beyond instrument specifications.