Related Experiment Videos
A novel method for differentiating dextran sulfate from related sulfated polysaccharides
K G Ludwig-Baxter1, R N Rej, A S Perlin
1Department of Chemistry, McGill University, Montreal, Quebec, Canada.
Journal of Pharmaceutical Sciences
|July 1, 1991
Summary
A novel method unequivocally identifies dextran sulfate by chemically and enzymatically breaking it down into isomaltose. This technique, utilizing NMR spectroscopy, confirms molecular changes and quantifies products for accurate dextran sulfate analysis.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Spectroscopy
Background:
- Dextran sulfate is a complex polysaccharide with diverse applications.
- Accurate identification and characterization of dextran sulfate are crucial for quality control and research.
- Existing methods may lack specificity or comprehensive analytical capabilities.
Purpose of the Study:
- To develop a method for the unequivocal identification of dextran sulfate.
- To establish a reliable analytical approach for quantifying dextran sulfate and its hydrolysis products.
- To characterize the sulfation patterns of dextran sulfate using advanced spectroscopic techniques.
Main Methods:
- Combined chemical desulfation and dextranase enzymolysis of dextran sulfate.
- High-resolution proton nuclear magnetic resonance (1H NMR) spectroscopy (300 MHz) for monitoring molecular transformations.
- Two-dimensional (2D) 1H and 13C NMR spectroscopy for detailed structural analysis and sulfation extent determination.
- High-performance liquid chromatography (HPLC) and gas-liquid chromatography (GLC) for product quantification.
Main Results:
- The method successfully converted approximately 80% of highly and moderately sulfated dextran sulfates.
- Isomaltose was identified as the major hydrolysis product, indicating dextran-type precursors.
- NMR analysis confirmed extensive sulfation at C-4 (75%) and near-complete sulfation at C-2 and C-3 positions in a high molecular weight dextran sulfate.
- Hydrolysis products, including isomaltose and minor amounts of alpha-D-glucose, could be quantified using NMR, HPLC, or GLC.
Conclusions:
- The developed desulfation-enzymolysis method provides unequivocal identification of dextran sulfate.
- This methodology enables accurate estimation of hydrolysis products, extending beyond NMR to HPLC and GLC.
- The study provides detailed insights into the sulfation patterns of dextran sulfate molecules.