Cytiva ÄKTA Pure Protein Purification System

Overview

The Cytiva ÄKTA Pure Protein Purification System is a modular, benchtop liquid chromatography platform engineered for high-precision, scalable purification of proteins, peptides, antibodies, and nucleic acids across research and early-process development laboratories. Based on over 30 years of evolution from the established AKTA platform—and building upon more than five decades of Cytiva’s (formerly GE Healthcare Life Sciences) expertise in biomolecule separation—the system implements classical chromatographic principles including affinity, ion exchange, size exclusion, hydrophobic interaction, and reversed-phase chromatography. Its core architecture follows the Couette–Poiseuille flow paradigm optimized for low-shear, laminar elution profiles, ensuring minimal structural perturbation to labile biomolecules. The system operates under fully programmable gradient, step, or isocratic elution modes, with real-time monitoring of UV absorbance, conductivity, pH, and pressure—enabling robust method transfer from analytical to preparative scale.

Key Features

• Modular hardware design with front-facing valves, detectors, and column connections—optimized for visual traceability of fluid paths and rapid reconfiguration between purification workflows.
• Integrated air sensor technology in all inlet valves prevents bubble formation and ensures uninterrupted overnight operation under unattended conditions.
• Direct injection capability eliminates reliance on sample loops; supports both manual and optional automated sample pump-driven loading for volumes up to 100 mL per run.
• Dual UV detection architecture: base configuration includes a fixed-wavelength 280 nm LED-based detector (zero warm-up time, high photostability); upgradeable to a xenon lamp–based multi-wavelength detector capable of simultaneous acquisition at three user-defined wavelengths (e.g., 260 nm, 280 nm, and 320 nm) for co-elution assessment and impurity profiling.
• Compact footprint (48 kg total mass) enables stable placement on standard laboratory benches or integration into refrigerated chromatography cabinets (4–8 °C) for temperature-sensitive targets such as membrane proteins or unstable enzyme complexes.
• Full hardware compatibility with Cytiva’s full suite of prepacked columns (HiTrap®, HiPrep™, Tricorn™, XK™, and HiScale™ series) and bulk resins—including POROS™, Capto™, and Sepharose™ families—ensuring seamless method scalability.

Sample Compatibility & Compliance

The ÄKTA Pure accommodates sample loads ranging from microgram-scale analytical purifications to gram-level preparative isolation without hardware modification. It supports aqueous and organic-aqueous mobile phases compatible with common biological buffers (e.g., Tris-HCl, phosphate, sodium acetate), chaotropic agents (e.g., urea, guanidine HCl), and mild organic modifiers (e.g., acetonitrile, isopropanol). All wetted parts are constructed from chemically inert, USP Class VI-certified materials (e.g., PEEK, stainless steel 316L, fused silica capillaries), ensuring compliance with ISO 13485 and adherence to Good Manufacturing Practice (GMP) and Good Laboratory Practice (GLP) documentation requirements. When configured with UNICORN 6.3 or later and audit trail enabled, the system meets FDA 21 CFR Part 11 criteria for electronic records and signatures—including user access control, change tracking, and immutable data archiving.

Software & Data Management

Controlled exclusively via UNICORN 6 software—a validated, Windows-based application designed for regulated environments—the system delivers intuitive method development, execution, and reporting. Preconfigured method templates accelerate routine workflows (e.g., His-tag purification, antibody capture, desalting), while advanced scripting supports custom logic for conditional fraction collection, dynamic hold steps, and real-time peak integration. Optional Design of Experiments (DoE) module enables systematic optimization of critical parameters (e.g., gradient slope, flow rate, wash stringency) using statistically rigorous experimental matrices—reducing total runs required for method qualification. Raw data (UV, conductivity, pressure) are stored in vendor-neutral .chm binary format, exportable to CSV or ASCII for third-party analysis; chromatograms and reports comply with LIMS interoperability standards (e.g., ASTM E1702, ISO/IEC 17025).

Applications

• Purification of recombinant proteins expressed in E. coli, yeast, insect, or mammalian cell systems—including His-, GST-, FLAG-, or Strep-tagged variants.
• Monoclonal antibody (mAb) capture and polishing steps: Protein A affinity capture followed by ion exchange or multimodal resin polishing.
• Isolation of viral vectors (AAV, lentivirus) and plasmid DNA using anion exchange or size exclusion chromatography.
• Characterization-grade purification of membrane proteins solubilized in detergent micelles or nanodiscs.
• High-throughput screening of binding partners via affinity pull-down coupled with on-line UV/Vis and conductivity monitoring.

FAQ

What chromatographic techniques does the ÄKTA Pure support?
Affinity, ion exchange, size exclusion, hydrophobic interaction, and reversed-phase chromatography—all using commercially available prepacked or custom-packed columns.
Can the system be upgraded from single- to multi-wavelength detection?
Yes—base configurations include a fixed 280 nm LED detector; the xenon lamp–based multi-wavelength detector is a field-installable option requiring only mechanical and firmware updates.
Is UNICORN software compliant with FDA 21 CFR Part 11?
Yes, when deployed with audit trail, electronic signatures, and role-based user permissions enabled—provided the host operating system and network infrastructure meet validation requirements.
What is the maximum recommended flow rate and system pressure?
Standard configuration supports up to 20 mL/min at ≤20 MPa (290 psi); higher-pressure modules (e.g., ÄKTA Pure 25) extend operational limits to 25 MPa for UHPLC-compatible resins.
Does the system support pH monitoring during runs?
Yes—when equipped with an optional inline pH sensor and compatible buffer reservoirs, real-time pH feedback can be integrated into method logic for pH-gradient elution or conditional fraction collection.