Methods for analysis of urinary glycosaminoglycans.

Area of Science:

• Biochemistry
• Analytical Chemistry
• Clinical Diagnostics

Background:

• Glycosaminoglycans (GAGs) are vital components of the extracellular matrix.
• Analysis of urinary GAGs aids in diagnosing various metabolic disorders.
• Current routine diagnostic methods require efficient and accurate GAG analysis.

Purpose of the Study:

• To review and describe methods for analyzing urinary GAGs applicable to routine assays.
• To evaluate the effectiveness of different separation and quantification techniques for GAGs.
• To provide insights into GAG analysis for diagnosing conditions such as mucopolysaccharidoses.

Main Methods:

• Cetylpyridinium chloride (CPC) precipitation for GAG isolation.
• One-dimensional cellulose acetate electrophoresis with various solvents for GAG separation.
• Discontinuous electrophoresis using barium acetate buffers for improved GAG separation.
• High-Performance Liquid Chromatography (HPLC) for analyzing enzymatic digestion products of GAGs.

Main Results:

• CPC precipitation is common but time-consuming for GAG isolation.
• Electrophoresis, particularly discontinuous methods, can suffice for routine GAG identification.
• HPLC effectively separates and quantifies digestion products of heparan sulfate, hyaluronic acid, and chondroitin sulfate isomers.
• Advanced HPLC for intact GAGs is not yet widely available.

Conclusions:

• Established electrophoresis and HPLC methods are suitable for routine urinary GAG analysis.
• These methods enable sensitive quantitation and investigation of GAG constituents.
• Applied methods have shown utility in analyzing urine from patients with mucopolysaccharidoses.