1260 Infinity II Low Dispersion Kit - Technical Note

Significance of the Topic

The control of extra-column dispersion in high-performance liquid chromatography (HPLC) is critical for preserving chromatographic resolution, sensitivity, and reproducibility. Low dispersion capillaries and heat exchangers reduce band broadening between the sampler, column, and detector, enabling more accurate qualitative and quantitative analyses in pharmaceutical, biochemical, and environmental laboratories.

Goals and Study Overview

This technical note focuses on the installation procedures for the Agilent 1260 Infinity II Low Dispersion Kit (G7111-68708) and the 1260 Infinity II Bio Low Dispersion Kit (G7131-68708). The aim is to guide end users through correct assembly, component selection, and best practices to ensure optimal system performance.

Used Instrumentation

• 1260 Infinity II Low Dispersion Kit (G7111-68708): includes ST capillaries (0.12 mm × 105 mm and 0.12 mm × 500 mm), Quick Connect Heat Exchanger Standard, and intermediate fittings.
• 1260 Infinity II Bio Low Dispersion Kit (G7131-68708): includes MP35N capillaries (0.12 mm × 105 mm and 0.12 mm × 500 mm), Quick Connect Bio Heat Exchanger Standard Flow, and Quick Turn fitting.
• Open-end wrench (1/4 – 5/16 inch) for torque control.

Methodology

1. Select a mounting position for the heat exchanger in the MCT heater block, using central positions when a single column is installed.
2. Assemble the heat exchanger: counter-hold the port with a wrench and tighten capillary fittings to a maximum of 2.5 Nm to prevent damage.
3. Connect the 0.12 mm × 500 mm sampler outlet capillary to the inlet port of the heat exchanger.
4. Attach the 0.12 mm × 105 mm column connection capillary to the heat exchanger outlet.
5. Secure the heat exchanger in the heater block groove using the provided column holders.
6. Install the analytical column: connect the 0.12 mm × 105 mm capillary from the heat exchanger to the column inlet, and couple the column outlet to the detector flow cell using the Quick Turn fitting.

Main Results and Discussion

• Proper torque application prevents port deformation and leakage.
• Color-coded sleeves (red for ST capillaries, red with orange stripe for MP35N) ensure correct kit usage and prevent cross-system mixing.
• Positioning the heat exchanger centrally optimizes thermal equilibration.
• Post-use flushing with water is essential after high-salt applications to avoid salt-crystal blockages.

Benefits and Practical Applications

• Reduced band broadening enhances peak shapes and resolution in trace-level analyses.
• Modular design allows rapid kit installation and straightforward maintenance.
• Compatibility with both standard and bio-analytical workflows expands utility in proteomics and biopharmaceutical research.

Future Trends and Potential Applications

Advances may include the integration of ultra-low dispersion microfluidic modules, improved biomaterial coatings for enhanced chemical resistance, and automated torque-controlled couplings. Further miniaturization and inline monitoring of dispersion will support next-generation high-throughput and single-cell analyses.

Conclusion

Implementing the Agilent 1260 Infinity II Low Dispersion and Bio Low Dispersion Kits ensures precise fluidic connections, minimizes dispersion, and preserves chromatographic integrity. Adherence to torque limits, color coding, and flushing protocols delivers reliable, high-performance separations.

References

Agilent Technologies Inc. 1260 Infinity II Low Dispersion Kit Technical Note (G7111-90130 Rev. B), 04/2021.