Automated Preparative Purification Using Nexera UFPLC

Significance of the topic

Preparative liquid chromatography (prep LC) is a cornerstone technique in pharmaceutical, food and chemical industries for isolating target molecules from complex mixtures. A common bottleneck after preparative fractionation is that collected material is highly diluted in aqueous mobile phase, making downstream drying, powdering and handling time-consuming and resource intensive. Automated workflows that concentrate and transfer target compounds into organic-solvent–rich fractions can substantially accelerate transfer to solid form and improve throughput in discovery, purification and analytical follow-up.

Objectives and study overview

This application note demonstrates how the Nexera UFPLC (Ultra Fast Preparative and Purification LC) automates preparative fractionation, on-line trapping/concentration, desalting and elution into an organic solvent. Using a seven-compound small-molecule mixture with hydrocortisone as a model target, the study compares conventional preparative LC collection with Nexera UFPLC-enabled trapping, evaluates repeated loading to increase concentration, and assesses purity and recovery of the collected fractions.

Methodology

The workflow comprises three automated steps: fractionation on a preparative column with concurrent introduction of target peaks onto an on-line trap column (concentration), rinsing the trap with appropriate aqueous solvent to remove counterions and nonvolatile salts (purification/desalting), and elution of the trapped target with an organic solvent (recovery). The system supports automated repeated injections to load multiple fractions onto a single trap column to further concentrate the analyte.

Key experimental choices and rationale:

• Use of a dilution pump delivering water during fractionation to enhance retention on the trap and avoid breakthrough.
• Use of an elution pump delivering acetonitrile to recover the analyte in an organic-solvent–rich state, minimizing subsequent drying time.
• Simultaneous splitting of preparative flow to an MS detector via a make-up pump to provide both UV and MS triggers for accurate fraction collection.

Used instrumentation

The automated workflow was executed on the Nexera UFPLC platform controlled by the Purification Solution software. Principal modules and components used in the study included:

• Preparative modules: prep pumps (LC-20AP), preparative column (Shim-pack Scepter C18-120, 150 mm × 20 mm, 5 µm).
• Trap column: Shim-pack UFPLC trap (≈30 mm × 20 mm I.D., 20–30 µm).
• Valves and fractionation hardware: FCV-12AH switching valves and LH-40 fraction collector/auto-sampler.
• Detectors: preparative UV detectors (SPD-M40 and SPD-40V high-pressure cells) and LCMS-2050 mass spectrometer (ESI/APCI DUIS source) used with a make-up pump (LC-40D) to split flow to MS.
• Pumps for dilution and elution: dedicated dilution pump (LC-20AP delivering water) and elution/makeup pump (LC-40D delivering acetonitrile/makeup solvent).

Main results and discussion

Case study findings (hydrocortisone and papaverine examples):

• Hydrocortisone: Conventional preparative LC collection produced a fraction concentration of ~500 mg/L (20 mL collected; 36% acetonitrile in water). Using Nexera UFPLC with on-line trapping and subsequent elution in acetonitrile, the recovered concentration increased to ~1111 mg/L (27 mL collected; 100% acetonitrile), a ~2.2× improvement. Repeated loading (three injections) onto the trap column was used to reach the higher concentration.
• Papaverine (peak tailing scenario): Preparative LC gave ~17 mg/L in a 60 mL fraction (30% acetonitrile in water). Nexera UFPLC recovered ~111 mg/L in a 9 mL fraction (100% acetonitrile), an approximate 6.5× improvement. This demonstrates that trap-based concentration is effective regardless of peak shape or tailing, because the analyte is retained on the trap prior to elution.
• Purity and recovery: Reanalysis of hydrocortisone collected via UFPLC showed high purity and nearly quantitative recovery versus standards when evaluated under analytical conditions, indicating the trap/elute process does not compromise sample integrity.

Benefits and practical applications

Principal advantages of the Nexera UFPLC workflow:

• High-concentration recovery in organic solvent reduces or eliminates lengthy post-collection drying and powdering steps, accelerating sample handling and downstream workflows.
• Automated desalting on the trap column removes nonvolatile salts and counterions prior to elution, improving compatibility with organic solvents and reducing interference for subsequent analyses or formulations.
• Repeated automated loading onto a single trap enables cumulative concentration of low-abundance targets without changing preparative separation conditions.
• Integration of UV and MS triggers via flow splitting provides robust fraction collection even for complex matrices or coeluting species.

Future trends and potential uses

Likely directions and applications for trap-enabled automated preparative systems include:

• Scale-up strategies in purification workflows where multiple trap columns or larger trap geometries enable preparative isolation at higher throughput while maintaining concentrated organic-eluted fractions.
• Integration with automated solid-phase extraction and online analytics for end-to-end purification, identification and formulation screening in drug discovery and natural product isolation.
• Extended workflows for biologically relevant small molecules and complex mixtures that require on-line desalting prior to MS-based characterization or chemical derivatization.
• Adoption in regulated environments (QA/QC) with additional validation of trap recovery, carryover and robustness to support GMP-compatible purification.

Conclusion

The Nexera UFPLC platform combines preparative separation with an on-line trap column and dedicated automation software to concentrate, desalt and elute target compounds into organic solvent, significantly improving recovered concentration and reducing post-processing workload. The approach is robust to peak shape and benefits from repeated loading to achieve higher concentrations. This methodology can accelerate preparative workflows in pharmaceutical and chemical laboratories where time-to-solid and solvent compatibility are critical.

References

• Shimadzu Corporation. Ultra Fast Preparative and Purification LC System — Application News (01-01222-EN). First Edition: May 2026. Shimadzu Corporation product and application documentation.