Intelligent System Emulation Technology Transfers Methods from Binary to Quaternary LC

Significance of the Topic

Seamless transfer of chromatographic methods between legacy and modern liquid chromatography systems reduces validation costs and downtime in regulated and industrial environments. Intelligent System Emulation Technology (ISET) enables quaternary LC platforms to mimic binary gradient behavior, ensuring consistent performance across instrument generations.

Study Objectives and Overview

This technical overview evaluates the ability of an Agilent 1290 Infinity Quaternary LC system equipped with ISET to emulate gradient methods originally developed on Agilent 1100 Series Binary LC instruments. Key metrics include retention time deviation and resolution consistency for challenging gradients spanning low to high organic content.

Experimental Methodology

Standard and challenging gradient separations were performed on both systems using identical column and mobile phase conditions. Three sample sets were evaluated:

• RRLC checkout mix: nine ketone compounds, gradient from 15 to 90 % acetonitrile over 10 min.
• Caffeine and theophylline mix: gradient from 5 to 12 % acetonitrile over 10 min.
• Testosterone: gradient from 80 to 95 % acetonitrile over 10 min.

Employed Instrumentation

• Agilent 1290 Infinity Quaternary LC: G4202A pump, G4226A autosampler, G1330B thermostat, G1316C column compartment, G4212A DAD.
• Agilent 1100 Series Binary LC: G1379A degasser, G1312A pump, G1313A autosampler, G1316A thermostat, G1315B DAD.
• Column: ZORBAX Eclipse Plus C18, 4.6 × 100 mm, 5 µm.
• Mobile phases: water (A) and acetonitrile (B); flow rates 1.0–1.2 mL/min; detection at 245–254 nm.
• Data acquisition: Agilent OpenLAB CDS ChemStation Rev.C.01.05.

Main Results and Discussion

Method emulation with ISET yielded retention time deviations below 0.6 % for all gradients, well within the ±5 % acceptance criteria. Without ISET, deviations reached up to –6.1 % for the 15–90 % gradient due to lower delay volume of the quaternary system. Resolution improved by 2–9 % after emulation, demonstrating equal or better separation quality. Hydrophilic and hydrophobic analytes alike showed consistent retention and peak shape when ISET was applied.

Practical Benefits and Applications

ISET facilitates direct method transfer without re‐optimization, preserving existing validation packages. Laboratories can upgrade to quaternary LC platforms while maintaining historical data comparability, reducing regulatory burden and accelerating time to results.

Future Trends and Potential Uses

Extending emulation across other binary systems (e.g., Agilent 1200, 1260) promises broad applicability. Integration with high-throughput workflows and advanced data analytics could further streamline method migration and performance monitoring.

Conclusion

Agilent ISET on 1290 Infinity Quaternary LC effectively emulates 1100 Series Binary gradient methods, achieving minimal retention time shifts and maintained or improved resolution. This capability simplifies instrument upgrades and method management in regulated and industrial laboratories.

References

1. Huesgen A. G. Seamless instrument‐to‐instrument method transfer from an Agilent 1100/1200 Series LC to an Agilent 1290 Infinity LC using Intelligent System Emulation Technology (ISET). Agilent Technologies Technical Overview, 5990-9113EN, 2011.