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Thermally stable alkaline chitin solutions via cryogenic processing enable homogeneous functionalization.

Shichao Bi1, Jinchang Liang2, Guohui Sun3

  • 1Laoshan Laboratory, Qingdao, 266000, China.

Carbohydrate Polymers
|February 19, 2026
PubMed
Summary

Chitin solutions in alkali/urea solvents can now withstand heat for stable chemical modifications. A new low-temperature conditioning method prevents gelling, enabling efficient chitin functionalization and creating water-soluble derivatives.

Keywords:
Alkali/ureaChitinGelationHomogeneous chemical modificationLow-temperature storage

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Area of Science:

  • Biopolymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Alkali/urea solvents rapidly dissolve chitin and chitosan for chemical modification.
  • Chitin solutions tend to gel at higher temperatures, limiting thermally driven reactions.
  • Residual inter-chain associations in dissolved chitin cause heat-induced gelling.

Purpose of the Study:

  • To overcome the thermal instability of chitin solutions in alkali/urea solvents.
  • To develop a method for stable, homogeneous chemical modification of chitin at elevated temperatures.
  • To enhance the utility of chitin and chitosan in functional materials construction.

Main Methods:

  • A post-dissolution low-temperature conditioning strategy (-20°C for ≥24h) was applied to chitin solutions.
  • The conditioned solutions were subjected to thermally driven homogeneous chemical modifications (alkylation, carboxylation, quaternization) at 55°C.
  • Molecular dispersion and thermal stability of conditioned chitin solutions were analyzed.

Main Results:

  • Low-temperature conditioning significantly improved molecular dispersion and thermal stability of chitin solutions.
  • Conditioned solutions remained fluid for over 24 hours at 55°C.
  • Homogeneous alkylation, carboxylation, and quaternization achieved high efficiency (DS > 90%), yielding water-soluble quaternized chitin.

Conclusions:

  • The low-temperature conditioning strategy effectively prevents gelling in alkali/urea chitin solutions.
  • This method enables efficient, thermally demanding homogeneous chemistry for chitin functionalization.
  • The findings broaden the applicability of alkali/urea solvents for biopolymer modification and materials development.