UHPLC Analysis of 2-Aminobenzamide- Labeled Glycans with the Vanquish Flex System

Significance of the Topic

Glycan structures on proteins influence therapeutic efficacy, cell recognition and serve as disease biomarkers. Accurate profiling of these complex molecules is critical in biopharmaceutical development and clinical research.

Objectives and Study Overview

This work evaluates the Thermo Scientific Vanquish Flex UHPLC system with fluorescence detection for the separation, detection and quantification of 2-aminobenzamide (2AB) labeled N-glycans. Bovine fetuin and human IgG glycan libraries are used to assess retention time precision, area precision, linearity and flow cell selection criteria.

Methodology and Used Instrumentation

Released N-glycans were labeled with 2AB and purified. Two HILIC columns were tested: a GlycanPac AXR-1 column with ternary gradient elution and an Accucore 150 Amide HILIC column with binary gradient. A Vanquish Flex UHPLC system comprising Quaternary Pump F, Split Sampler FT, Column Compartment H with active preheater and a Vanquish Fluorescence Detector F was employed Detection used excitation/emission pairs selected automatically via a filter wheel and optimized sensitivity settings

• Vanquish Flex UHPLC System with Quaternary Pump F, Split Sampler FT and Column Compartment H
• Vanquish Fluorescence Detector F with interchangeable 2 µL and 8 µL flow cells
• GlycanPac AXR-1 and Accucore 150 Amide HILIC columns
• Chromeleon 7.2 SR3 chromatography data system

Main Results and Discussion

The GlycanPac AXR-1 column resolved over 60 fetuin glycan species within 50 minutes, while the Accucore Amide HILIC column separated more than 20 IgG glycoforms in 30 minutes. Retention time precision was outstanding, with RSD values below 0.1 % for fetuin glycans, below 0.04 % for IgG glycans and 0.008 % for a single 2AB-NA2 standard. Area precision for 1 pmol injections showed RSD of 0.92 % and linearity was excellent (r2>0.99) across femtomole to picomole ranges. Comparison of flow cells indicated that the 8 µL cell enhances sensitivity at the cost of peak broadening, while the 2 µL cell provides sharper peaks and higher resolution.

Benefits and Practical Applications

High retention time reproducibility enables reliable peak assignment against glucose unit libraries without co-elution risk. The broad linear range supports both trace quantitation and routine profiling. Biocompatible flow paths allow seamless coupling with mass spectrometry for structural confirmation. This platform is ideal for biotherapeutic glycan characterization, biomarker discovery and quality control workflows.

Future Trends and Potential Applications

Integration with high-resolution MS and automated sample handling will streamline glycan structural elucidation. Novel fluorescent tags and advanced stationary phases may further boost sensitivity and selectivity. Machine learning-driven data processing could accelerate peak identification and quantitation. Emerging applications include cell-surface glycomics and clinical biomarker validation.

Conclusion

The Vanquish Flex UHPLC system with fluorescence detection delivers robust, high-resolution, and sensitive analysis of 2AB-labeled glycans. Exceptional precision and linearity combined with flexible flow cell options make it a versatile platform for both academic and industrial glycomics.

References

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