Omnifit EZ-15-25-AA Axial Compression Chromatography Column (Glass, 15 mm ID × 250 mm Length)

Overview

The Omnifit EZ-15-25-AA is a high-precision, dual-adjustable axial compression chromatography column engineered for reproducible protein purification under medium-pressure liquid chromatography (MPLC) conditions. Designed and manufactured in the UK by Diba Ltd., this column employs a robust borosilicate glass body with fully adjustable end fittings—enabling precise control of bed compression at both the inlet and outlet ends. Its operational principle relies on uniform axial force application to eliminate void formation and ensure consistent packing density across the stationary phase, critical for maintaining resolution, peak symmetry, and column longevity during repeated use in affinity, ion exchange, size exclusion, or hydrophobic interaction chromatography (HIC). The 15 mm internal diameter and 250 mm effective bed length support analytical-to-preparative scale separations (0.5–940 mL column volumes), making it suitable for integration into modular purification workflows including GE Cytiva AKTA systems, Sanotac BioLot platforms, and Bio-Rad NGC high-performance chromatography systems.

Key Features

• Dual-end axial compression mechanism allows independent adjustment of both top and bottom end fittings to maintain optimal bed integrity during method development and scale-up.
• Borosilicate glass column body ensures optical clarity for visual bed inspection, thermal stability, and resistance to thermal shock between 4–40 °C.
• Chemically inert construction: PTFE end caps, polyethylene (PE) frits (20 µm pore size standard), FKM/FPM elastomer O-rings, and acetal compression nuts provide broad compatibility with common aqueous and organic mobile phases used in protein purification.
• Pressure-rated to 300 psi (20 bar) at 15 mm ID—validated per Omnifit’s published pressure vs. diameter matrix—supporting operation on standard MPLC and low-to-medium pressure preparative HPLC systems.
• Modular, tool-free assembly with standardized 1/4-28 UNF threaded connections enables rapid column changeover and system reconfiguration without specialized hardware.
• Supplied with complete accessory kit: two lengths of 1/16″ OD × 0.020″ ID PTFE tubing (2 m and 0.5 m), each terminated with PP 1/4-28 UNF male connectors for leak-tight integration into existing fluidic manifolds.

Sample Compatibility & Compliance

The Omnifit EZ-15-25-AA is validated for use with biological macromolecules—including monoclonal antibodies, recombinant enzymes, fusion proteins, and plasma-derived therapeutics—in compliance with Good Laboratory Practice (GLP) and current Good Manufacturing Practice (cGMP) environments where traceability and material accountability are required. Its pH tolerance (1–14) and thermal operating range accommodate stringent cleaning-in-place (CIP) protocols using sodium hydroxide (≤10%), phosphoric acid (≤10%), or ethanol/water mixtures. The column is not intended for use with aggressive solvents such as acetone, chloroform, dichloromethane, ethyl acetate, or concentrated acidic/basic solutions beyond specified limits—exposure may compromise frit integrity or cause stress cracking in the glass body. All materials comply with USP Class VI biocompatibility standards and EU Regulation (EC) No 1935/2004 for food contact materials, supporting its deployment in preclinical and process development laboratories subject to FDA 21 CFR Part 11 data integrity requirements when paired with compliant chromatography data systems.

Software & Data Management

While the Omnifit EZ-15-25-AA is a hardware-only component with no embedded electronics or firmware, its mechanical design supports full traceability within regulated software environments. When deployed with AKTA Pure/Explorer, Bio-Lot, or NGC systems, column identity (model number, serial batch, dimensions), usage history, and maintenance logs can be recorded manually or via electronic lab notebook (ELN) integration. The standardized geometry and pressure rating facilitate accurate backpressure modeling and flow rate calibration in method transfer studies. For audit readiness, users are advised to document column lot numbers, packing procedures, and compression torque values (recommended: 1.2–1.5 N·m for acetal nuts) in alignment with ISO 17025 and ICH Q5A/Q5B guidance for biopharmaceutical characterization.

Applications

• Scalable purification of His-tagged proteins using Ni-NTA or Co²⁺ resins under native or denaturing conditions.
• Polishing steps in mAb downstream processing, including Protein A capture followed by cation-exchange (CEX) or anion-exchange (AEX) polishing on rigid resin beds.
• Desalting and buffer exchange of crude lysates via Sephadex G-25 or Superdex 75 columns.
• Method development for HIC purification of aggregation-prone proteins using ammonium sulfate gradients.
• Continuous flow chemistry coupling—e.g., immobilized enzyme reactors (IMERs) or solid-phase synthesis cartridges—where uniform flow distribution and minimal wall effects are essential.
• Academic and industrial research requiring column interchangeability across multiple instrument platforms without revalidation.

FAQ

What is the maximum recommended operating pressure for the 15 mm ID version?
The Omnifit EZ-15-25-AA is rated for continuous operation up to 300 psi (20 bar) at ambient temperature. Short-term excursions to 350 psi are permissible if duration remains under 5 minutes and temperature is maintained below 35 °C.
Can this column be packed in-house with custom resins?
Yes—the dual-adjustable design supports slurry packing of commercially available or proprietary media (e.g., agarose-, silica-, or polymer-based resins) using standard packing manifolds and controlled flow rates (typically 0.5–2.0 mL/min for 15 mm ID). Post-packing compression must be applied gradually while monitoring backpressure.
Is sterilization by autoclaving possible?
No—borosilicate glass and acetal components are not autoclavable. Sterilization should be performed via 0.22 µm filtration of solvents, 70% ethanol rinse, or validated chemical sanitization (e.g., 0.1 M NaOH for 1 hour, followed by thorough equilibration).
How does axial compression improve chromatographic performance compared to fixed-end columns?
Axial compression mitigates bed settling and channeling by maintaining constant interparticle force throughout the run, resulting in higher plate counts (>10,000 N/m), improved asymmetry factors (As < 1.3), and extended column lifetime—particularly during gradient elution or high-viscosity sample loading.
Are replacement parts available separately?
Yes—Omnifit supplies individual components including PTFE end caps (EZ-CAP-15), PE frits (EZ-FRIT-15), FKM O-rings (EZ-ORING-15), and acetal adjustment nuts (EZ-NUT-AA), enabling cost-effective refurbishment without full column replacement.