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COLUMN USER GUIDE for Agilent Normal-Phase and HILIC Columns

Manuals | 2019 | Agilent TechnologiesInstrumentation
Consumables, LC columns
Industries
Manufacturer
Agilent Technologies

Summary

Importance of the Topic


Analytical separations with normal-phase and HILIC chromatography are crucial for resolving a wide range of polar and nonpolar analytes. Agilent’s portfolio of ZORBAX, Pursuit, Polaris, and InfinityLab Poroshell columns provides robust, high-resolution solutions for both research and quality control applications.

Objectives and Overview


This user guide consolidates best practices for installation, operation, and maintenance of Agilent normal-phase and HILIC columns. It covers QC performance testing, safety considerations, recommended fittings, method development tips, cleaning, storage, and use in supercritical fluid chromatography.

Methodology and Instrumentation


  • QC Column Performance: Each column ships with a QC performance report and test chromatogram generated on an optimized instrument to minimize extracolumn volume.
  • Column Connections: InfinityLab Quick Turn and Quick Connect fittings (p/n 5067-5966, 5067-5965) support dead-volume-free connections up to 1300 bar.
  • System Optimization: Minimize tubing length, use 0.12 mm id tubing for standard LC and 0.075 mm id tubing for UHPLC to reduce band broadening.

Key Features and Recommendations


  • Installation: Observe flow-direction markings; 1.8 µm columns are unidirectional; avoid overtightening and damaging PEEK-lined columns.
  • Safety: All LC connections can leak; use chromatography-grade solvents; operate within pressure limits; handle dry packings in ventilated areas.
  • Operating Parameters (Normal-Phase): pH 1.0–10.0 (phase-dependent), max 60 °C, recommended 30 °C; silica solubility increases above pH 6 and 40 °C.
  • HILIC Operation: Shipped in high-organic solvents; require extended equilibration (20–100 column volumes); pH 0.0–12.0, max 80 °C for select phases.
  • Method Development: Normal-phase employs nonpolar solvents (e.g., hexane/isopropanol); HILIC uses acetonitrile–water with 5–10 mM buffers, gradient from high to lower organic content.
  • Cleaning and Storage: Flush with 20 column volumes of organic solvents; normal-phase columns can be stored in mobile phase; HILIC columns store in 95:5 acetonitrile:water.
  • SFC Compatibility: Flush shipping solvents with methanol or isopropanol; remove CO2; avoid storing in CO2/MeOH mixtures.

Benefits and Practical Applications


  • Wide solvent compatibility for diverse analytes
  • High robustness for long-term, high-throughput operation
  • Superficially porous and bonded phases for fast and selective separations
  • Recommended guard columns and fittings to protect investments

Future Trends and Opportunities


  • Expansion of superficially porous particle technology for improved speed and resolution
  • Integration of phase-normal and HILIC chemistry into supercritical fluid chromatography and MS workflows
  • Development of zwitterionic and mixed-mode stationary phases for enhanced selectivity
  • Automation of column care and method optimization via AI-driven software

Conclusion


Adhering to the guidelines in this user guide ensures reliable installation, operation, and maintenance of Agilent normal-phase and HILIC columns, maximizing performance and column lifetime.

References


  • Agilent InfinityLab Fittings Brochure (5991-5164EN)

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