Catalog Number - 40008-PG4

The 40008‑PG4 Cogent Bidentate C8 Guard Column Starter Set is a complete protection solution for standard‑flow analytical HPLC systems, providing everything needed to begin protecting columns from particulates, contaminants, and strongly retained compounds.

This starter kit includes:

• (1) Reusable stainless steel guard column holder

• (5) Bidentate C8 guard cartridges

  • 4.0 mm ID × 10 mm length

  • Packed with 4 µm, 100 Å TYPE‑C™ silica hydride phase

Each cartridge is packaged in an individual, closeable Delrin™ case to prevent drying, contamination, and physical damage before use.

The included holder is compatible with all Cogent TYPE‑C™ guard cartridges, allowing flexibility across different phases and methods.

Designed for Standard Analytical Column IDs

This starter kit is optimized for:

• 3.0 mm ID solvent‑saving columns

• 4.0 mm ID mid‑scale analytical columns

• 4.6 mm ID standard analytical columns

This makes it ideal for conventional HPLC systems where moderate to higher flow rates are used.

Proper guard column selection ensures:

• Minimal impact on peak shape

• Maintained column efficiency

• Consistent chromatographic performance

Why Use a Guard Column Starter Kit

Analytical columns are commonly exposed to:

• Particulates and insoluble debris

• Strongly retained or irreversible contaminants

• Sample matrix buildup

• Chemical fouling

The 40008‑PG4 starter kit provides a sacrificial guard layer, helping to:

• Extend analytical column lifetime significantly

• Maintain consistent performance and reproducibility

• Reduce costly column replacements

• Improve laboratory efficiency

Under typical laboratory conditions, the included five cartridges often provide protection for the full usable life of an analytical column.

Bidentate C8 Guard Phase Advantages

Using a guard column with the same phase as the analytical column ensures:

• Matched selectivity and retention characteristics

• No impact on method performance

• Seamless analyte transfer

Compared to C18 phases, Bidentate C8:

• Reduces excessive hydrophobic retention

• Improves recovery of amine-containing compounds

• Provides alternative selectivity for complex mixtures

• Enables faster equilibration

Cogent TYPE‑C™ Technology Benefits

Silica Hydride Surface

• Reduced silanol activity

• Improved peak shape for basic analytes

• Lower secondary interactions

Faster Equilibration

• Reduced cycle times

• Increased sample throughput

Durability

• Resistant to hydrolysis

• Long column and cartridge lifetime

• Stable under demanding analytical conditions

Typical Applications

• Standard analytical HPLC workflows

• Pharmaceutical and QC testing

• Method development and routine analysis

• Complex sample matrices

• Applications using 3.0–4.6 mm ID columns