Stable Isotope Quantitative N-Glycan Analysis by Liquid Separation Techniques and Mass Spectrometry

Area of Science:

• Biochemistry
• Analytical Chemistry
• Glycomics

Background:

• Accurate quantitation of protein-derived oligosaccharides is difficult due to structural complexity and limited optical detection resolution.
• Existing methods struggle with incomplete separation and co-detection of diverse glycan species, impacting statistical analysis.

Purpose of the Study:

• To develop a mass-based method for reliable identification and relative quantitation of oligosaccharides.
• To overcome limitations of optical detection in glycan analysis.

Main Methods:

• Utilizing stable isotope variants of fluorescent tags for derivatization.
• Employing liquid chromatography (LC) or capillary electrophoresis (CE) coupled with mass spectrometry (MS).
• Analyzing ratios of light and heavy isotope clusters in extracted ion chromatograms/electropherograms.

Main Results:

• Stable isotope labeling enables mass-based identification of glycans.
• Relative quantitation is achieved through LC- and CE-mass spectrometry analysis.
• The method provides comparable assessment of glycoprotein-derived oligosaccharides.

Conclusions:

• Stable isotope-labeled tags offer a robust approach for oligosaccharide analysis.
• This method enhances accuracy in glycan quantitation and identification.
• It addresses key challenges in glycomics research.