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Ozonolysis for selectively depolymerizing polysaccharides containing beta-D-aldosidic linkages

Y Wang1, R I Hollingsworth, D L Kasper

  • 1Channing Laboratory, Brigham and Women's Hospital, and Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 17, 1998
PubMed
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A novel ozonolysis method selectively depolymerizes acetylated polysaccharides with beta-D-aldosidic linkages. This technique yields controlled oligosaccharide fragments without damaging acid-sensitive components like sialic acid.

Area of Science:

  • Carbohydrate Chemistry
  • Polymer Science
  • Biochemistry

Background:

  • Depolymerizing complex polysaccharides, especially those with acid-sensitive parts, into repeating units is challenging.
  • Existing methods often struggle with selectivity and preserving sensitive residues.

Purpose of the Study:

  • To introduce a new method for selective polysaccharide depolymerization using ozonolysis.
  • To demonstrate the method's effectiveness on bacterial polysaccharides containing acid-sensitive components.

Main Methods:

  • Acetylation of polysaccharides followed by selective ozone oxidation of beta-D-aldosidic linkages.
  • Cleavage of oxidized linkages using a nucleophile to yield oligosaccharides.
  • Controlled reaction time to achieve desired fragment sizes.

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Main Results:

  • Ozonolysis achieved highly selective cleavage of beta-D-aldosidic linkages based on conformational differences.
  • Bacterial polysaccharides, including those from group B Streptococcus, were successfully depolymerized.
  • The method preserved acid-sensitive sialic acid residues and produced fragments of controlled, narrowly distributed sizes.

Conclusions:

  • Ozonolysis offers a precise and selective approach for polysaccharide depolymerization.
  • This method is valuable for producing oligosaccharides from complex bacterial glycans without degradation.
  • The ability to control fragment size and preserve sensitive residues opens new avenues in glycobiology research.