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Inhibiting Ice Recrystallization by Nanocelluloses.

Teng Li1, Ying Zhao1,2, Qixin Zhong1

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Cellulose nanocrystals and TEMPO-oxidized cellulose nanofibrils show ice recrystallization inhibition (IRI) activity. These biocompatible nanomaterials could be developed as novel IRI agents, especially in non-saline conditions.

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Area of Science:

  • Materials Science
  • Biotechnology
  • Nanotechnology

Background:

  • Biocompatible materials with ice recrystallization inhibition (IRI) activity are valuable in various applications.
  • Facially amphipathic structures are often associated with IRI activity in antifreeze proteins and synthetic mimics.
  • Nanocelluloses, a class of renewable materials, exhibit amphiphilicity.

Purpose of the Study:

  • To investigate the ice recrystallization inhibition (IRI) activity of cellulose nanocrystals (CNCs) and 2,2,6,6-tetramethylpiperidine-1-oxyl oxidized cellulose nanofibrils (TEMPO-CNFs).
  • To explore the potential of nanocelluloses as novel IRI agents.

Main Methods:

  • Assessing IRI activity of CNCs and TEMPO-CNFs in different solutions (NaCl, phosphate-buffered saline, sucrose).
  • Evaluating thermal hysteresis and dynamic ice shaping activity.
  • Analyzing nanocellulose aggregation in saline solutions due to charge screening.

Main Results:

  • Effective IRI was observed with 5.0 mg/mL CNCs or 2.0 mg/mL TEMPO-CNFs in 0.01 M NaCl.
  • Observable IRI activity was found with 30.0 mg/mL CNCs in phosphate-buffered saline.
  • Decreased IRI activity in saline was attributed to nanocellulose aggregation caused by charge screening.
  • No thermal hysteresis or dynamic ice shaping activity was detected.

Conclusions:

  • Cellulose nanocrystals and TEMPO-CNFs demonstrate significant ice recrystallization inhibition (IRI) activity.
  • Nanocelluloses show promise as novel, biocompatible IRI agents, particularly in non-saline environments.
  • Further research may lead to the application of nanocelluloses in fields requiring ice inhibition.