Agilent 1290 Infinity Ultra Low Dispersion Kit

Importance of the Topic

The minimization of extra column volume is vital for ultrahigh-performance liquid chromatography (UHPLC) using narrow bore columns. Reducing dispersion outside the column preserves peak efficiency and resolution, particularly for early eluting compounds and high-throughput analyses.

Objectives and Study Overview

This technical note outlines the purpose, components, and step-by-step installation of the Agilent 1290 Infinity Ultra-Low Dispersion Kit (p/n 5067-5189). The goal is to guide users in upgrading a 1290 Infinity LC system to achieve lower extra column volume and improved chromatographic performance on 2.1 mm and 1 mm inner diameter columns.

Methodology

• Activate maintenance mode in the instrument interface or Agilent Lab Advisor software to enable component changes.
• Employ standard tools (1/4–5/16″ wrench, Torx TX8 screwdriver, flat-head screwdriver) and follow safety measures to avoid leaks and needle injury.
• Complete sequential installation of three subassemblies: low-dispersion needle seat, heat exchanger, and microbore capillaries.

Instrumental Setup

• Base system: Agilent 1290 Infinity LC comprising G4220A/B Binary Pump, G4226A Autosampler, G1316B/C Thermostatted Column Compartment, and a compatible detector.
• Kit components:
  • Stainless steel capillary 0.075 mm × 340 mm (p/n 5067-4783)
  • Stainless steel capillary 0.075 mm × 220 mm (p/n 5067-4784)
  • Low-Dispersion Needle Seat Assembly (p/n G4226-87020)
  • Heat Exchanger Long Up 0.075 mm, 1.0 µL (p/n G1316-80012)
• Optional parts for varied configurations: downward heat exchanger, carriers, screw sets, and fitting holders.

Main Results and Discussion

• Use of 0.075 mm ID capillaries substantially reduces extra column volume, essential for maintaining sharp peak profiles on small ID columns.
• Backpressure increases (approximately +165 bar at 1 mL/min with water) remain within the 1290 LC’s high-pressure capabilities.
• Significant improvement in resolution and peak shape for early eluting analytes in both isocratic and gradient modes on 2.1 mm and 1 mm columns.

Benefits and Practical Applications

• Enhanced chromatographic efficiency by limiting post-column band broadening.
• Ideal for pharmaceutical impurity profiling, metabolomics, and high-throughput screening requiring sharp, well-defined peaks.
• Enables microflow methods by extending UHPLC advantages to low dead-volume configurations.

Future Trends and Potential Applications

• Further miniaturization of fluidic pathways to sub-50 µm ID for even lower dispersion.
• Implementation of advanced materials and additive manufacturing to produce zero-dispersion fittings and durable microfluidic components.
• Integration with high-resolution mass spectrometry and next-generation detectors for ultra-trace analysis in life sciences and environmental testing.

Conclusion

The Agilent 1290 Infinity Ultra-Low Dispersion Kit provides a straightforward upgrade to minimize extra column volume and optimize chromatographic performance on narrow bore columns. Adhering to the recommended installation procedures yields sharper peaks and improved resolution with manageable pressure increases.

References

• Agilent Technologies (2011): Installing the 1290 Infinity Ultra-Low Dispersion Kit 5067-5189. Technical Note, Part Number 01290-90100.