Ice Nucleation Promotion Impact on the Ice Recrystallization Inhibition Activity of Polyols

Area of Science:

• Materials Science
• Biophysics
• Physical Chemistry

Background:

• Heterogeneous ice nucleation, crucial for cryopreservation and biological survival, occurs over a broad temperature range.
• Uncontrolled ice crystal growth can cause cellular damage, necessitating antifreeze proteins (AF) and analogs.
• Current AF agents face limitations when nucleation occurs at lower temperatures, hindering their efficacy.

Purpose of the Study:

• To investigate the controlled ice nucleation using silver iodide (AgI) as a seeding agent.
• To enhance the efficacy of synthetic ice recrystallization inhibition (IRI) by controlling nucleation temperature.
• To explore the use of AgI in ultrapure water (UPW) and phosphate-buffered saline (PBS) for potent IRI.

Main Methods:

• Purposely seeding nascent ice crystals with AgI at a defined higher temperature (-7 °C).
• Utilizing ultrapure water (UPW) and AgI/PBS solutions for nucleation experiments.
• Evaluating the potency of synthetic IRI at various concentrations.

Main Results:

• AgI seeding at -7 °C in UPW resulted in highly potent synthetic IRI.
• Effective ice nucleation control was achieved, leading to enhanced IRI efficacy.
• Potent IRI was observed at concentrations as low as 0.001 mg·mL⁻¹.

Conclusions:

• Controlled ice nucleation with AgI at higher temperatures offers a significant advantage for IRI.
• This method provides a potent strategy for ice crystal control in biological and cryopreservation applications.
• AgI-mediated nucleation represents a promising advancement in synthetic antifreeze technology.