Catalog Number - 59021-25P

The 59021‑25P Cogent Axis C18™ HPLC Column is a proven, legacy reversed‑phase column, trusted for years by laboratories requiring reliable, reproducible performance in USP L1 methods.

Constructed with a fully double end‑capped C18 bonded phase on high‑purity silica, this column minimizes secondary interactions and ensures stable retention, excellent peak shape, and method reproducibility.

✅ Widely used as a standard reference column for USP L1 applications

250 mm Length – Maximum Resolution & Separation Power

• Provides the highest resolving power in the Axis C18 analytical range

• Maximizes peak capacity for highly complex mixtures

• Ideal for:

  • closely eluting analytes

  • impurity profiling and trace analysis

• Increases retention and separation efficiency

✅ Selected when maximum separation and analytical precision are required

4.6 mm ID – Standard Analytical Platform

• Compatible with standard HPLC systems

• Ideal for:

  • routine QC analysis

  • method validation and regulatory testing

Typical Flow Rate Range

• ~0.8–1.5 mL/min

✅ Provides robust, reproducible, and transferable results

5 µm Particle – Reliable Performance & Low Backpressure

• Provides:

  • Consistent efficiency for analytical methods

  • Lower backpressure vs smaller particle sizes

  • Long operational lifetime

✅ Ideal for:

• Routine laboratory workflows

• Method transfer across multiple systems

100 Å Pore Size – Standard Small Molecule Analysis

• Optimized for:

  • small molecules

  • traditional reversed‑phase separations

• Provides:

  • Consistent interaction with hydrophobic and neutral compounds

  • Predictable chromatographic behavior

✅ Ensures reliable performance in USP L1 methods

Why Choose Axis C18™ Columns

Proven Legacy Performance

• Widely used in analytical labs for many years

• Known for consistency and reliability

USP L1 Compatibility

• Ideal for USP L1 methods requiring standard C18 phases

• Supports method validation and transfer

Predictable Selectivity

• Traditional reversed‑phase retention behavior

• Reliable across standard analytical applications

✅ Preferred for routine and regulated laboratory workflows

Application Performance Advantages

• Suitable for:

  • Hydrophobic compounds

  • Neutral analytes

  • Long‑chain fatty acids

• Provides:

  • Longer retention than C8 columns

  • Improved separation for non‑polar analytes

✅ Ideal for general‑purpose reversed‑phase chromatography

System & Sample Considerations

• Compatible with standard HPLC systems

• Suitable for routine and high‑throughput workflows

Recommended sample preparation:

• 👉 Use 0.2 µm syringe filters for proper sample preparation before injection

✅ Helps:

• Prevent column fouling

• Maintain consistent analytical performance

Typical Applications

• USP L1 analytical methods

• Pharmaceutical QC and validation

• Routine HPLC analysis

• Complex mixture separations

• Impurity profiling

• Long‑chain fatty acid analysis

Important Usage Notes

• Designed for standard analytical HPLC systems (4.6 mm ID)

• Ideal for maximum resolution analytical workflows

• Suitable for USP L1 method development and validation

• Monitor system pressure based on instrument specifications