Column care guide and general method development information for Thermo Scientific HILIC columns

Importance of the Topic

Hydrophilic interaction liquid chromatography (HILIC) addresses the challenge of separating highly polar analytes that are poorly retained in reversed-phase methods. It is widely used in pharmaceutical, metabolomic, and proteomic analysis for its ability to resolve sugars, nucleotides, small polar metabolites, and highly hydrophilic peptides. Proper column care and optimized method development are essential to reproducible performance, extended column life, and reliable data in quality-control and research laboratories.

Goals and Study Overview

This guide outlines practical procedures for installing, conditioning, operating, cleaning, and storing HILIC columns bonded with amide, amino, cyano or bare silica phases. It illustrates how to interpret Certificates of Analysis or Quality Assurance Reports, establish reproducible baselines, and select mobile phases and buffers to develop robust, high-throughput HILIC methods suitable for LC-MS, charged aerosol detection, and UV applications.

Methodology and Instrumentation

Detailed procedures cover column equilibration, sample preparation, and system setup to minimize bleed and maximize chromatographic stability. Key steps include:

• Flushing new columns with intermediate solvents to remove shipping media, followed by gradient conditioning (e.g. 50:50 then 90:10 acetonitrile:buffer).
• Extended equilibration times (up to 3× longer than reversed-phase) to achieve thermal and chemical steady state, especially for UHPLC at >400 bar.
• Sample cleanup via filtration (0.2 µm for ≤2 µm particles; 0.45 µm for 5–10 µm) or SPE, plus use of guard columns or inline filters.
• Regular system leak checks and detector baseline monitoring.

Instrumentation

• Thermo Scientific HILIC columns (amide, amino, cyano, diol, bare silica).
• HPLC/UHPLC system capable of operating up to 400+ bar.
• Charged aerosol detector and mass spectrometer for volatile mobile phases.
• UV detector for transparent buffers.
• Water purification system and factory-filtered HPLC-grade solvents.
• Inline filters and guard cartridges.

Main Results and Discussion

Following these best practices enables users to reproduce Certificate of Analysis chromatograms and detect early signs of column degradation. Cleaning protocols tailored to routine maintenance, strong solvent flushing, and chelating buffer cycles effectively remove organic and metal contaminants. Mobile phase screening from 95% acetonitrile to 5% over 1 min/cm column length provides a generic gradient for method scouting. Buffer choices—ammonium formate, acetate, formic acid—are limited by miscibility, volatility, and pH compatibility; phosphate and non-volatile salts are discouraged.

Benefits and Practical Applications

• Enhanced reproducibility by matching initial CoA/QAR retention profiles.
• Extended column lifetime through proactive cleaning and storage strategies.
• Robust separation of polar analytes in QC, metabolomics, and proteomics workflows.
• Seamless compatibility with LC-MS and charged aerosol detection using volatile buffers.

Future Trends and Potential Applications

Advances in HILIC are expected to focus on novel stationary‐phase chemistries for improved selectivity, automated method development workflows leveraging high‐throughput screening, and integration with microfluidic and capillary LC systems. Green chromatography initiatives may drive the adoption of lower-toxicity solvents and buffer-free approaches. Enhanced coupling with high-resolution mass spectrometry will expand applications in biomarker discovery and impurity profiling.

Conclusion

Effective HILIC method development depends on meticulous column conditioning, rigorous sample preparation, and careful mobile phase selection. By following structured equilibration, cleaning, and storage protocols, analysts can achieve reproducible separations of polar compounds while maximizing column lifetime and data quality.

Reference

Thermo Fisher Scientific. Development guide: HILIC columns – Column care guide and general method development information for Thermo Scientific HILIC columns. 2022.