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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
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Advances in chitooligosaccharides chemical modifications.

Camille Chapelle1, Ghislain David1, Sylvain Caillol1

  • 1ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, France.

Biopolymers
|June 11, 2021
PubMed
Summary
This summary is machine-generated.

Chitooligosaccharides (COS) undergo chemical modification to enhance their properties. Functionalization of amine, hydroxyl, and aldehyde groups in COS creates novel, non-toxic, and biodegradable materials for diverse applications.

Keywords:
amphiphilic structureschitooligosaccharidescrosslinkingfunctionalization

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Organic Chemistry

Background:

  • Chitooligosaccharides (COS) are low molar mass derivatives of chitosan (<20 kg mol⁻¹).
  • COS possess reactive amine and hydroxyl groups, similar to chitosan.
  • Functionalization of COS can introduce new properties and expand their applications.

Purpose of the Study:

  • To detail recent developments in COS functionalization.
  • To focus on modifications of amine, hydroxyl, and aldehyde groups.
  • To compare functionalization protocols and identify potential errors.

Main Methods:

  • Chemical modification of COS, including amidation, esterification, epoxy-amine/hydroxyl coupling, Schiff base formation, and Michael addition.
  • Nitrous deamination to introduce aldehyde groups at the chain end of COS.
  • Analysis and comparison of various functionalization protocols from literature.

Main Results:

  • Functionalization significantly broadens the application scope of COS.
  • Modification of amine, hydroxyl, and aldehyde groups leads to diverse chemical structures.
  • Nitrous deamination enables synthesis of amphiphilic COS structures.
  • Identified and suggested corrections for potential errors in reported chemical structures.

Conclusions:

  • Chemical modification of COS offers a versatile route to novel biomaterials.
  • Functionalized COS are generally non-toxic, biobased, and biodegradable.
  • The study provides insights into reliable COS functionalization strategies for various applications.