Glycosaminoglycan Quality Control by Monosaccharide Analysis.

Area of Science:

• Biochemistry
• Analytical Chemistry

Background:

• Glycosaminoglycans (GAGs) are vital biomacromolecules with complex structures and high negative charge densities.
• Separating GAG types and removing GAG-binding proteins presents significant challenges for quality control.
• Existing quality control methods for GAGs are insufficient, particularly for general monosaccharide composition analysis.

Purpose of the Study:

• To develop a practical and quantitative method for GAG quality control.
• To analyze the monosaccharide composition of various GAGs to identify potential contaminants or structural variations.
• To establish a reliable method for distinguishing between different GAG types.

Main Methods:

• Utilized a PCR-facilitated hydrolysis assay to break down GAGs into constituent saccharides.
• Labeled hydrolyzed saccharides with 1-phenyl-3-methyl-5-pyrazolone (PMP).
• Quantified labeled saccharides using high-performance liquid chromatography (HPLC) coupled with mass spectrometry (MS).

Main Results:

• Detected glucosamine in chondroitin sulfate and dermatan sulfate, and galactosamine in heparan sulfate and heparin, indicating cross-contamination.
• Identified fucose in chondroitin sulfate, dermatan sulfate, and heparan sulfate, and fucose/mannose in chondroitin sulfate, suggesting co-present glycans or novel structures.
• Demonstrated that acid-resistant disaccharide analysis provides distinguishing features for each GAG type under identical hydrolysis conditions.

Conclusions:

• Monosaccharide composition analysis is a practical and quantitative approach for GAG quality control.
• The developed method effectively identifies cross-contamination and structural variations in GAG preparations.
• This technique enhances the reliability and safety of GAGs used in nutraceuticals and pharmaceuticals.