Phenyl Hexyl HPLC Columns for Polyaromatic Compounds

Enhanced Selectivity for Polyaromatic and Aromatic Compounds

USP® L11 Methods | Wide Particle Size Range | Scalable to Preparative HPLC

Cogent RP Phenyl Hexyl™ HPLC columns are designed for reversed‑phase separations involving polyaromatic compounds, aromatic hydrocarbons, and related analytes. These columns are especially effective for compounds containing benzene rings, nitro‑aromatics, polyaromatic hydrocarbons (PAHs), and certain polar compounds, including peptides.

Classified under USP® L11, Cogent RP Phenyl Hexyl™ columns are available in a wide range of particle sizes and formats, supporting both analytical and preparative scale‑up.

Phenyl Hexyl Selectivity Explained

Phenyl Hexyl stationary phases combine π–π interactions from the phenyl group with added hydrophobic retention from a six‑carbon aliphatic (C6) linker between the phenyl ring and the silica surface.

Compared to traditional phenyl phases, this C6 linkage provides:

• Increased hydrophobic selectivity

• Modified retention behavior for aromatic analytes

• Enhanced resolution for polyaromatic compounds

• Improved flexibility in method development

This unique balance makes Phenyl Hexyl columns particularly useful when standard C18 or phenyl phases do not deliver sufficient separation.

Column Construction and Surface Chemistry

Cogent RP Phenyl Hexyl™ columns are manufactured using world‑class, high‑purity silica and a bonding technology refined over many years, resulting in a highly stable and reproducible stationary phase.

Key construction features include:

• Phenyl Hexyl (phenyl‑C6) bonded phase

• Exhaustive double end‑capping to minimize secondary interactions

• Reduced peak tailing and improved peak symmetry

• High batch‑to‑batch consistency

• Long column lifetime and robust performance

These characteristics place Cogent RP Phenyl Hexyl™ among the finest and most reliable phenyl‑based phases available.

A Proven “Go‑To” Column for GMP and Research Labs

The Cogent RP Phenyl™ platform, including the Phenyl Hexyl variant, is widely regarded as a workhorse column for laboratories performing GMP, QC, research HPLC, and LC‑MS. Its reliability, reproducibility, and predictable selectivity make it a trusted choice for both routine and advanced analytical workflows.

Key Features and Benefits

• Designed for polyaromatic and aromatic compounds

• Suitable for USP® L11 methods

• Enhanced selectivity via phenyl‑C6 linkage

• Balanced π–π and hydrophobic interactions

• Exhaustive double end‑capping for improved peak shape

• Manufactured with high‑purity silica

• Available in a wide range of particle sizes

• Scalable from analytical to preparative HPLC

• Proven performance in HPLC and LC‑MS

Typical Applications

• Polyaromatic hydrocarbons (PAHs)

• Nitro‑aromatic compounds

• Aromatic pharmaceuticals and impurities

• Compounds with benzene ring structures

• Certain polar compounds and peptides

• GMP, QC, and research chromatography

Additional Resources

• View Cogent RP Phenyl Hexyl™ column specifications

• Learn more about the Cogent RP™ HPLC column family

Column Protection Recommendation

Important: MICROSOLV technical support strongly recommends using the Cogent Column Filter, which is included with each column, whenever possible. Column filters help protect against particulates, extend column lifetime, and maintain consistent chromatographic performance.

👉Learn more about the Cogent Column Filter for HPLC column protection