Tools to Assist in Moving Established Methods from an Originator HPLC System to an Alliance™ iS HPLC System

Significance of the Topic

Transferring validated HPLC methods to modern instrumentation is essential for laboratories aiming to update or standardize their analytical workflows. Differences in system dwell volume and gradient delay can lead to retention time shifts, potentially affecting method performance and regulatory compliance. Embedding software tools into the instrument control environment minimizes manual errors and accelerates method migration, ensuring consistency across platforms.

Objectives and Study Overview

This study evaluates two software-based approaches to facilitate the transfer of an existing gradient HPLC method from an Arc HPLC System to the Alliance iS HPLC System. The first tool, the Intelligent Method Translator App (iMTA), automates transcription of instrument parameters. The second approach, Gradient Start Options, compensates for dwell volume differences by adjusting the gradient start relative to injection time. The methods are demonstrated using a USP Diclazuril System Suitability Mixture.

Methodology and Used Instrumentation

Sample preparation and analysis were performed under consistent conditions on both systems. A 0.5 mg/mL solution of the USP Diclazuril System Suitability Mixture in dimethylformamide was injected in six replicates.

• Arc HPLC System with 2489 UV/Vis detector
• Alliance iS HPLC System with Tunable UV detector (TUV)
• Column: XSelect HSS T3, 3.5 µm, 4.6 × 100 mm at 35 °C
• Flow rate: 1.0 mL/min; injection volume: 5 µL
• Mobile phase A: acetonitrile : water : ammonium formate buffer (3 : 15 : 2)
• Mobile phase B: acetonitrile : water : buffer (85 : 5 : 10), pH 4.0
• Data management: Empower 3.7.0

Main Results and Discussion

Initial analyses on the Arc system and translated methods on the Alliance iS system showed retention time shifts of 0.324–0.408 min due to dwell volume differences. The average gradient delay difference was determined to be 359 µL. By adjusting the gradient start to occur 359 µL before injection on the Alliance iS system, retention differences were reduced to less than 0.06 min (0.22%). Overlayed chromatograms confirmed close alignment of seven target peaks after compensation.

Benefits and Practical Applications

Using embedded software tools offers several advantages:

• Automated transcription of key method parameters reduces transcription errors and saves time
• Dwell volume emulation via gradient start options eliminates manual gradient table edits
• Enhanced method reproducibility across different HPLC platforms
• Facilitated regulatory compliance by avoiding manual modifications to gradient tables

Future Trends and Potential Applications

Future developments may include broader system compatibility, integration of artificial intelligence for predictive method adjustments, and real-time feedback on system performance. Expanding the translator app to support additional legacy instruments and coupling with laboratory information management systems could further streamline method migration in regulated environments.

Conclusion

The combination of the Intelligent Method Translator App and Gradient Start Options on the Alliance iS HPLC System provides an efficient and compliant workflow for transferring gradient methods from older HPLC platforms. These tools ensure accurate parameter replication and automated dwell volume compensation, significantly reducing implementation time and error risk.

Reference

1. Hong P, Andrews R, Beals PC, McConville PR. Simplifying method transfer: Novel tools for replicating established methods on an ACQUITY Arc system. Waters Application Note 720005469; 2015.
2. United States Pharmacopeia. General Chapter <621> Chromatography. USP.
3. United States Pharmacopeial Convention. USP Diclazuril System Suitability Mixture RS Monograph. DOI:10.31003/USPNF_M24944_02_01.