N-Glycan Analysis of Biotherapeutic Glycoproteins Using AdvanceBio Gly-X 2-AB Express Sample Preparation and LC/FLD/MS

Importance of N-glycan Analysis in Biotherapeutics

N-linked glycans on therapeutic proteins influence immunogenicity, pharmacokinetics and pharmacodynamics. Reliable profiling of these structures is essential for ensuring biotherapeutic safety and efficacy and for meeting regulatory requirements.

Objectives and Overview

This document presents the AdvanceBio Gly-X 2-AB Express N-glycan analysis workflow and associated consumables. It covers streamlined sample preparation, chromatographic separation, fluorescence detection and mass spectrometry analysis for rapid and reproducible glycan mapping of biotherapeutic glycoproteins such as Rituxan and Enbrel.

Methodology and Used Instrumentation

The workflow consists of:

• Denaturation at 90 °C (3 min)
• PNGase F digestion at 50 °C (5 min) for unbiased glycan release
• 2-AB labeling on a solid-state matrix at 65–80 °C (60 min) without a drying step
• 96-well plate cleanup with acetonitrile washes (10–15 min)
• Elution of labeled glycans in water and UHPLC/FLD/MS analysis in under 2 h

Key instruments:

• Agilent 1290/1290 Infinity II Bio-Inert LC systems
• Agilent 1260 Infinity II FLD detector (λEx 285 nm, λEm 345 nm)
• Agilent 6545XT AdvanceBio Q-TOF LC/MS
• MassHunter BioConfirm software

Main Results and Discussion

The combined workflow delivers complete sample preparation in under 2 hours. HILIC-UHPLC profiles of Rituxan and Enbrel show clear resolution of major N-glycan species (e.g., G0F, G1F, G2F, sialylated forms) with relative area CVs typically below 5 %. Solid-phase 2-AB labeling and streamlined cleanup reduce variability and hands-on time.

Benefits and Practical Applications

• Fast, high-throughput sample processing suitable for routine QC
• No sample drying step accelerates workflow
• Compatibility with existing 2-AB datasets ensures data continuity
• Modular kit format allows flexible use and scaling
• Comprehensive consumables list facilitates procurement

Future Trends and Opportunities

Integration of this workflow with automated liquid handling platforms and expanded software capabilities will further enhance throughput and data consistency. Emerging labeling chemistries and advanced column technologies may extend the method to more complex glycoforms. Adoption in regulated environments will drive standardization across laboratories.

Conclusion

The AdvanceBio Gly-X 2-AB Express workflow offers a robust, reproducible, and standardized solution for N-glycan analysis of biotherapeutics. Its rapid sample preparation, combined with high-resolution HILIC-UHPLC and MS detection, supports both research and quality control applications.

Reference

• Agilent Technologies. N-Glycan Analysis: Better Together. Brochure 5994-1647EN.
• Agilent Technologies. Streamlined Workflows for N-Glycan Analysis of Biotherapeutics using AdvanceBio Gly-X Instant PC and 2-AB Express Sample Preparation with LC/FLD/MS. Application Note 5994-1348EN.
• Agilent Technologies. Analysis of labeled Glycans User Manual. Publication 5994-1231EN.
• Agilent Technologies. AdvanceBio Glycan Standards Technical Flyer. Publication 5994-2202EN.
• Varki A, Cummings RD, Aebi M, Packer NH, Seeberger PH, Esko JD, et al. Symbol Nomenclature for Graphical Representations of Glycans. Glycobiology. 2015;25(12):1323–1324.
• Agilent Technologies. Development of a Rapid 2-AB Sample Preparation Workflow for N-Glycan Release and Labeling. Application Note 5994-0945EN.
• Agilent Technologies. AdvanceBio Gly-X N-Glycan Prep with 2-AB Express Kit User Manual. Publication 5994-1228EN.