The Agilent 1290 Infinity II Multi‑Method Solution

Significance of the Topic

The ability to run multiple liquid chromatography methods on a single platform greatly enhances throughput and flexibility in food testing laboratories. Automated column and solvent switching reduces downtime between analyses of diverse compounds such as preservatives, dyes, drugs, and toxins, improving reproducibility and resource utilization.

Objectives and Study Overview

This work describes an automated multi-method LC solution using the Agilent 1290 Infinity II system. Seven distinct analyses—covering food preservatives, parabens, antiparasitic agents, coloring additives, antimicrobial drugs, mycotoxins, and antioxidants—are executed in sequence without manual intervention. The study demonstrates how method-driven selection of columns and solvents streamlines complex workflows.

Methodology and Instrumentation

A single LC setup integrates:

• Agilent 1290 Infinity II Flexible Pump with two external solvent-selection valves
• Agilent 1290 Infinity II Multicolumn Thermostat (up to eight columns)
• Agilent 1290 Infinity II Multisampler
• Agilent 1290 Infinity II DAD detector
• Agilent OpenLAB ChemStation software

Columns and solvents are defined in the software, linked to valve positions by color code. Automated routines perform solvent flushes and column equilibration between methods. Up to 26 solvents and more than 1 000 method combinations are accessible.

Main Results and Discussion

Seven groups of analytes were separated with high resolution and reproducibility:

• Preservatives (benzoic acid, salicylic acid, sorbic acid) on C8 with TFA water and ACN/IPA
• Parabens (methyl, ethyl, propyl, butyl) on C18 with ammonium acetate buffer and methanol
• Antiparasitic malachite green on SB C18 with formic acid water and ACN
• Sudan dyes I–IV on Eclipse plus C18 with formic acid water and ACN
• Antimicrobial chloramphenicol on SB C8 with water and methanol
• Mycotoxin patulin on Extend C18 with basic water and ACN
• Antioxidants (PG, BHA, BHT, TBHQ) on Eclipse C18 with acetic acid water and ACN

Retention times were stable across automated exchanges, and DAD detection provided sensitivity and spectral confirmation for each class.

Benefits and Practical Applications

This automated multi-method solution reduces manual interventions, accelerates turnaround for diverse sample sets, and ensures consistent thermal and flow control. It is ideal for QA/QC, food safety monitoring, and high-throughput research requiring rapid method switching.

Future Trends and Opportunities

Advances may include integration with mass spectrometry for enhanced identification, machine-learning-driven method optimization, expansion of green solvent libraries, and real-time process control. Such developments will further boost analytical flexibility and sustainability.

Conclusion

The Agilent 1290 Infinity II Multi-Method Solution provides a robust, automated platform for sequential analysis of multiple compound classes on a single LC system. By combining multicolumn thermostatting with solvent selection valves and advanced sampling, it delivers high throughput, reproducibility, and operational efficiency.

References

• Performance Characteristics of the Agilent 1290 Infinity II Multicolumn Thermostat; Agilent Technologies, Inc., Publication 5991-5533EN, 2015.
• Performance Characteristics of the Agilent 1290 Infinity II Multisampler; Agilent Technologies, Inc., Publication 5991-5348EN, 2014.