AZURA® Preparative HPLC

Importance of Topic

Preparative high-performance liquid chromatography (HPLC) is an indispensable tool for isolating, purifying and collecting target compounds at scales ranging from milligrams to kilograms. Its applications span peptide and oligonucleotide purification, RNA processing, natural product isolation (including cannabis extracts) and active pharmaceutical ingredient (API) production. High purity, yield and throughput requirements drive innovation in system design, automation and continuous processes.

Objectives and Study Overview

This whitepaper presents the AZURA® Preparative HPLC platform by KNAUER, a modular solution designed to address flexible purification workflows. The objectives are to:

• Introduce the configurable hardware series for isocratic and gradient operation.
• Demonstrate scale-up from compact laboratory systems to pilot-scale units.
• Highlight advanced modes such as stacked injections, peak recycling and simulated moving bed (SMB) chromatography.
• Showcase integration of automated sample injection, solvent selection, detection and fraction collection.

Methodology and Instrumentation

The AZURA platform combines interchangeable modules within a docking station or standalone devices. Key components include:

• Eluent delivery pumps (50–1 000 mL/min) with low- and high-pressure gradient options and solvent selection valves.
• Sample injection via manual valves, autosamplers (up to 10 mL vials or microplates), or integrated Liquid Handler LH 2.1 for up to 60 mL loops and automated selection.
• Column modules supporting 5–250 mm internal dimensions and up to three simultaneous columns with switching valves.
• Detection by UV/VIS single-wavelength or diode array detectors with fiber-optic flow cells, refractive index (RID) and light scattering (ELSD) options.
• Fraction collectors ranging from multiposition valves to high-capacity Foxy® R1 and LABOCOL Vario units handling up to hundreds of tubes or microplates.
• Software control via PurityChrom®, ClarityChrom®, OpenLAB® and Chromeleon™ for method setup, animated flow path visualization, peak- or time-based collection, GLP data management and mobile device operation.

Main Results and Discussion

The AZURA platform enables:

• Rapid system reconfiguration to meet changing purification tasks—from analytical scale screening through preparative and pilot production.
• Efficient scale-up by exchanging pump heads, flow cells and valves without revalidating the entire system.
• Enhanced throughput through stacked injections, where subsequent injections overlap previous runs to maximize column usage.
• Improved resolution of challenging separations by peak recycling and solvent recycling, reducing solvent consumption by up to 90 % and solid phase costs by 80 %.
• Continuous separation with SMB for two-component mixtures, achieving simultaneous high purity and yield with minimal solvent use.
• Integration of online SPE, mass-triggered fractionation and conductivity monitoring to boost selectivity and reduce matrix effects.

Benefits and Practical Applications

Users of the AZURA preparative platform gain:

• Customizable flow rates (0.001–1 000 mL/min) and pressure ranges (up to 400 bar).
• Flexible sample volumes from microliters to tens of milliliters with variable loop and autosampler configurations.
• Automated methods for peptide, oligonucleotide, natural product and API purifications in R&D, QA/QC and production environments.
• Modular expansion from compact laboratory units to pilot-scale systems without major capital reinvestment.
• Reduced solvent usage, labor costs and time-to-product through advanced modes and software guidance.

Future Trends and Opportunities

Emerging directions include:

• Integration with mass spectrometry for targeted fraction collection and rapid method optimization.
• Single-use fluidics and biocompatible materials for cGMP production of large biomolecules.
• Machine-learning-driven method development and real-time process analytics (PAT).
• Continuous multicolumn chromatography beyond binary mixtures to handle complex feeds.
• Remote monitoring and cloud-based data management for decentralized laboratories.

Conclusion

The AZURA Preparative HPLC platform delivers a highly adaptable, scalable and automation-ready solution for modern analytical chemistry challenges. By combining modular hardware, advanced purification modes and intuitive software, laboratories and production facilities can achieve optimal balance of purity, yield and throughput across a wide range of applications.