Reach New Heights in Performnace Agilent Altura HPLC columns with Ultra Inert technology

Importance of the topic

High-performance liquid chromatography (HPLC) remains central to pharmaceutical, environmental, and biopharmaceutical analysis. Metal-induced adsorption and nonspecific surface interactions along the LC flow path can degrade sensitivity, distort peak shapes, and compromise quantitation—especially for trace-level, polar, or metal-sensitive analytes such as phosphopeptides, oligonucleotides, and short-chain PFAS. Technologies that reduce active metal sites in the flow path while preserving mechanical robustness therefore deliver immediate gains in data quality, method robustness, and regulatory compliance for laboratories facing increasingly demanding detection limits.

Objectives and overview

This document presents the Agilent Altura family of HPLC columns built with Ultra Inert technology and related Agilent bio-inert LC components. The primary objectives are to describe how Ultra Inert hardware improves chromatographic performance for metal-sensitive analytes, to summarize performance benefits for bioanalytical workflows and ultrashort-chain PFAS analysis, and to outline practical laboratory implementations and part options across the Altura portfolio.

Methodology and approach

The presented performance claims are based on comparative chromatographic evaluations using conventional stainless steel (SS) column hardware and commercially available inert-column competitors. Key assessment metrics include sensitivity (signal response), signal-to-noise ratio, peak shape (tailing/recovery), equilibration times, retention behavior for highly polar PFAS (C1–C3), and operational robustness under high-pressure conditions. Representative separations include reversed-phase phosphopeptide analyses and LC–MS workflows for ultrashort-chain PFAS using a mixed-mode C18 stationary phase.

Used instrumentation

Altura product family and supporting instrumentation referenced in the material include the following items and system combinations. Part numbers shown here are representative examples provided by the vendor and are summarized rather than transcribed in full tabular format.

• Altura HPLC columns with Ultra Inert hardware: BioHPLC, Poroshell PFAS, Eclipse Plus C18, Poroshell HILIC-Z, Peptide Plus, Oligo HPH-C18, and Poroshell HPH-C18 variants (various sizes and particle technologies: sub-2 µm and superficially porous particle formats).
• Altura Poroshell 120 PFAS columns (mixed-mode C18 for ultrashort-chain PFAS) and a dedicated PFAS delay column to reduce system-derived PFAS background.
• Agilent InfinityLab and Infinity III LC platforms: 1290 Infinity III bio LC and 1260 Infinity III bio-inert LC systems for high-precision and maximum inertness workflows, respectively.
• Auxiliary items to support MS workflows: bio solvent bottle (propylene), bio solvent inlet filter, and an InfinityLab PFAS conversion kit for PFAS-focused configurations.

Main results and discussion

Altura columns with Ultra Inert technology demonstrate consistent improvements in chromatographic performance for metal-sensitive analytes and ultrashort-chain PFAS. Key reported findings include:

• Enhanced bioanalytical sensitivity and peak shape: In reversed-phase phosphopeptide separations, Altura columns produced substantially higher signal response and improved peak shapes compared with stainless-steel hardware and competitive inert-column offerings. Quantitatively, sensitivity gains reported include up to 6.5× higher signal versus SS hardware and up to 2× versus a leading competitor; signal-to-noise improvements reported up to 3× versus Competitor 1 and up to 10× versus SS hardware.
• Improved recovery and reduced nonspecific binding: The Ultra Inert coating reduces adsorption of peptides, proteins, oligonucleotides, and post-translationally modified species, resulting in higher recovery and more accurate quantitation at low-abundance levels. Rapid equilibration times and reduced carryover further boost throughput and data reliability.
• Superior ultrashort-chain PFAS retention and resolution: Altura Poroshell 120 PFAS columns, employing a mixed-mode C18 stationary phase optimized for polar analytes, deliver much longer retention for C1–C3 PFAS compared with several competitors (reported up to ~5× longer retention for short-chain PFAS). Longer retention enables better early-eluting peak separation, improved method flexibility, and more robust peak identification in complex matrices.
• Operational robustness and lifetime: The Ultra Inert coating is described as mechanically robust and compatible with high backpressures encountered with sub-2 µm and superficially porous particle columns, supporting sustained performance in routine and regulated lab environments.

Benefits and practical applications

Practical benefits for analytical laboratories include:

• Higher method sensitivity and lower detection limits for metal-chelating or surface-active analytes, supporting trace-level quantitation in bioanalysis and environmental testing.
• Cleaner peak shapes and higher sample recovery for peptides, oligonucleotides, and phosphopeptides—important for biopharmaceutical characterization, impurity profiling, and PTM analysis.
• Reliable direct-injection LC–MS workflows for ultrashort-chain PFAS, with increased retention and separation space to resolve early-eluting polar contaminants.
• Reduced method development time due to faster column equilibration and predictable inertness across the flow path, aiding routine QC and regulated assays.
• Compatibility with existing Agilent InfinityLab consumables and bio-inert LC systems, enabling relatively straightforward integration into established laboratory platforms.

Future trends and potential applications

Anticipated developments and opportunities where Ultra Inert-type technologies add value include:

• Continued demand for improved inert flow paths as detection limits tighten in environmental monitoring (PFAS regulations), advanced biotherapeutic characterization, and metabolomics.
• Broader adoption of mixed-mode and engineered stationary phases that, combined with inert hardware, enable direct injection workflows and simplified sample preparation for polar analytes.
• Integration of bio-inert LC systems with high-resolution MS instruments and automated sample-prep modules to create end-to-end pipelines for low-level impurity testing.
• Materials and coating advances focused on long-term chemical stability and resistance to aggressive mobile phases to further extend column lifetime in high-throughput laboratories.

Conclusion

Altura HPLC columns with Ultra Inert technology address persistent challenges caused by active metal sites and surface interactions in LC workflows. By combining a flow-path coating that minimizes metal-induced adsorption with robust stationary-phase formats (including mixed-mode C18 and superficially porous particles), Altura enables higher sensitivity, improved peak shape, and greater retention control—particularly for metal-sensitive biomolecules and ultrashort-chain PFAS. The result is improved method performance, faster equilibration, and practical compatibility with bio-inert LC systems in regulated and environmental laboratories.

References

Agilent Technologies. Altura brochure and product literature, including Brochure 5994-8687EN (bio applications), Flyer 5994-8941EN (PFAS solutions), and Product bulletin 5994-9097EN (Altura family overview). Published June 2026.