Innovations in FFF – Eclipse NEON

Importance of the topic

Field-flow fractionation (FFF) combined with multi-angle light scattering (MALS) and dynamic light scattering (DLS) enables absolute size, molar mass and compositional analysis of polymers, proteins, nanoparticles and complex biocolloids. It overcomes limitations of size-exclusion chromatography (SEC) and batch techniques by accommodating ultra-high-molar-mass species, broad size distributions and delicate nanoassemblies. Applications span pharmaceutical development, nanomedicine, environmental tracers and quality control in industrial analytics.

Objectives and study overview

This white paper presents Wyatt Technology’s Eclipse NEON, the next-generation FFF platform introduced in late 2020. The primary objectives were to enhance usability, robustness and performance of FFF separations, streamline method development, reduce sample dilution and add capabilities such as electrophoretic mobility measurements and seamless switching between FFF and SEC modes.

Methodology and instrumentation

The Eclipse NEON system integrates:

• Eclipse NEON controller with intelligent Coriolis flow meters, pressure, leak and vapor sensors for real-time diagnostics
• Temperature-regulated FFF channels (variable and fixed heights) machined from stainless steel
• Dilution Control Module (DCM) to reduce post-channel dilution by up to tenfold
• Eclipse Mobility module for electrical/asymmetrical-flow FFF (EAF4) and zeta potential analysis
• Inline detectors: DAWN MALS, WyattQELS DLS, Optilab differential refractometer and UV/Vis absorption
• Agilent 1260 fluidics (degasser, pump, autosampler) and automated solvent recycling
• VISION DESIGN and RUN software for in silico method development, sequence control and data analysis

Main results and discussion

Key performance enhancements include:

• Multi-touch front panel with dashboard alerts and a history of alarms
• Continuous monitoring of flow rates and pressures, preventing failed runs and improving retention-time reproducibility to ±2.5 s
• DCM-enabled detector signal gains up to 5× for analytical runs and up to 10× for fraction collection
• Temperature regulation that stabilizes retention times against ambient fluctuations
• Fixed-height channels offering reproducible channel geometry and rapid assembly without torque wrenches
• EAF4 functionality to resolve electrophoretic mobility and zeta potential of distinct populations within a polydisperse sample
• FFF-SEC switching to compare orthogonal separations using the same fluidics and detectors

Benefits and practical applications

The Eclipse NEON platform simplifies complex multipath flow control and method development, reducing trial-and-error, saving sample and solvent, and increasing throughput. Its integrated diagnostics minimize downtime and maintenance. Applications include high-molar-mass polymer characterization, nanoparticle drug-delivery profiling, vaccine and gene-vector analysis, environmental tracer monitoring and quality control in pharmaceutical pipelines.

Future trends and applications

Emerging directions include advanced automation and AI-driven method optimization, novel membrane chemistries for specialized separations, multiplexed or high-throughput FFF arrays, integration with mass spectrometry, and expanded use of electrical field FFF for detailed charge profiling. These trends will further broaden FFF applications in nanomedicine, biopharmaceuticals and environmental analytics.

Conclusion

Eclipse NEON represents a leap forward in FFF technology by combining robust engineering, smart diagnostics, user-friendly software and advanced separation modules. It delivers reproducible, high-resolution and versatile size, mass and charge characterization for a wide range of analytical challenges.

References

1. Kok WT. Optimization of Asymmetrical Field-Flow Fractionation AF4. LCGC Europe. 2010;23(1):18–25.
2. Litzen A, Wahlund KG. Zone broadening and dilution in rectangular and trapezoidal asymmetrical-flow field-flow fractionation channels. Anal Chem. 1991;63(10):1001–1007.
3. Johann C, Elsenberg S, Schuch H, Rösch U. Instrument and Method to Determine the Electrophoretic Mobility of Nanoparticles and Proteins by Combining Electrical and Flow Field-Flow Fractionation. Anal Chem. 2015;87(8):4292–4298. DOI:10.1021/ac504712n.