Enhanced Protocol for Quantitative N-linked Glycomics Analysis Using Individuality Normalization when Labeling with Isotopic Glycan Hydrazide Tags (INLIGHT)™

Overview

Journal Anal Bioanal Chem

Specialty Chemistry

Date 2020 Aug 27

PMID 32844281

Citations 6

Authors

Jaclyn Gowen Kalmar

Karen E Butler

Erin S Baker

David C Muddiman

Affiliations

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Abstract

The analysis of N-linked glycans using liquid chromatography and mass spectrometry (LC-MS) presents significant challenges, particularly owing to their hydrophilic nature. To address these difficulties, a variety of derivatization methods have been developed to facilitate improved ionization and detection sensitivity. One such method, the Individuality Normalization when Labeling with Isotopic Glycan Hydrazide Tags (INLIGHT)™ strategy for labeling glycans, has previously been utilized in the analysis of N- and O-linked glycans in biological samples. To assess the maximum sensitivity and separability of the INLIGHT™ preparation and analysis pipeline, several critical steps were investigated. First, recombinant and nonrecombinant sources of PNGase F were compared to assess variations in the released glycans. Second, modifications in the INLIGHT™ derivatization step were evaluated including temperature optimization, solvent composition changes, reaction condition length and tag concentration. Optimization of the modified method resulted in 20-100 times greater peak areas for the detected N-linked glycans in fetuin and horseradish peroxidase compared with the standard method. Furthermore, the identification of low-abundance glycans, such as (Fuc)(Gal)(GlcNAc)(Man)(NeuAc) and (Gal)(GlcNAc)(Man)(NeuAc), was possible. Finally, the optimal LC setup for the INLIGHT™ derivatized N-linked glycan analyses was found to be a C18 reverse-phase (RP) column with mobile phases typical of RPLC.

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