Reversed-Phase HPLC Columns for Analytical, USP and Method Development Applications
Cogent RP HPLC Columns are high-purity silica reversed-phase columns designed for analytical HPLC methods, compendial testing, pharmaceutical analysis, impurity profiling, stability studies, and method development. Available in a wide range of stationary phases, particle sizes, and column dimensions, Cogent RP columns provide reliable retention, reproducible selectivity, and long column lifetimes for both routine and challenging chromatographic applications.
Manufactured using high-purity spherical silica and advanced bonding technologies, Cogent RP columns are used worldwide in pharmaceutical, biotechnology, environmental, food, and research laboratories.
Which Cogent RP Column Should You Choose?
Choose C18 When:
- You need a general-purpose HPLC column.
- You are developing a new reversed-phase method.
- You require strong hydrophobic retention.
- You are running most pharmaceutical assays and impurity methods.
- USP Classification: L1 View Cogent RP C18 Ordering Information
Choose C8 When:
- C18 provides excessive retention.
- Faster analysis times are needed.
- Your analytes are moderately hydrophobic.
- USP Classification: L7 View Cogent RP C8 Ordering Information
Choose C12 When:
- C18 retention is too strong.
- C8 retention is insufficient.
- Additional flexibility is needed during method optimization.
- View Cogent RP C12 Ordering Information
Choose C30 When:
- Analytes are highly hydrophobic.
- Shape recognition is important.
- Working with carotenoids, lipids, or fat-soluble compounds.
- USP Classification: L62 View Cogent RP C30 Ordering Information
Choose Cyano (CN) When:
- Alternative selectivity is required.
- Legacy USP methods specify Cyano phases.
- Reduced hydrophobic interactions are beneficial.
- USP Classification: L10 View Cogent RP Cyano Ordering Information
Choose Phenyl When:
- Analytes contain aromatic rings.
- π-π interactions can improve resolution.
- Structural similarity makes separation difficult.
- USP Classification: L11 View Cogent RP Phenyl Ordering Information
Choose Phenyl-Hexyl When:
- Additional aromatic selectivity is needed.
- Complex impurity profiles require orthogonal retention mechanisms.
- Traditional alkyl phases are insufficient.
- USP Classification: L11 View Cogent RP Phenyl-Hexyl Ordering Information
Choose PFP (Pentafluorophenyl) When:
- Separating halogenated compounds.
- Positional isomers are difficult to resolve.
- Alternative selectivity beyond C18 or Phenyl is needed.
- USP Classification: L43 View Cogent PFP Column Ordering Information
Choose C4 When:
- Working with proteins and peptides.
- Biomolecules require lower hydrophobic retention.
- Recovery of large molecules is important.
- USP Classification: L26 View Cogent RP C4 Ordering Information
Available Column Formats
Cogent RP phases are available in:
- Guard Columns
- Analytical Columns
- Semi-Preparative Columns
- Preparative Columns
- Purification Columns
Common internal diameters include:
- 2.1 mm ID
- 3.0 mm ID
- 4.6 mm ID
- 10 mm ID
- 21.2 mm ID
- 30 mm ID
- 50 mm ID
Typical Flow Rate Guidelines
Analytical Columns
- 2.1 mm ID: ~0.2-0.3 mL/min (requires reliable low-flow HPLC performance)
- 3.0 mm ID: ~0.4-0.6 mL/min
- 4.6 mm ID: ~1.0-1.5 mL/min
Semi-Preparative Columns
- 10 mm ID: ~4-8 mL/min
Preparative Columns
- 21.2 mm ID: ~15-25 mL/min
- 30 mm ID: ~30-50 mL/min
Purification Columns
- 50 mm ID: system and application dependent, commonly 80+ mL/min
Why Choose Cogent RP Columns?
- High-purity silica with low metal content
- Consistent lot-to-lot reproducibility
- Excellent peak shape and efficiency
- Broad USP phase coverage
- Analytical through purification-scale formats
- Suitable for method development and validated methods
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Long-term technical support from MICROSOLV
| Application Notes (Knowledge Base) | General RP HPLC Tips (Knowledge Base) |
| Download Literature - Ordering Brochure (PDF) | USP© Columns Classification List |
| Specifications Page | |
