Development and Physical Characterization of α-Glucan Nanoparticles.

Area of Science:

• Biochemistry
• Materials Science

Background:

• Alpha-glucans synthesized from sucrose using glucansucrase from *Leuconostoc mesenteroides* NRRL B-1118 exhibit a glass transition temperature of approximately 80 °C.
• These properties suggest potential for novel material development.

Purpose of the Study:

• To characterize the formation and stability of alpha-glucan nanoparticles.
• To evaluate their structural integrity and performance under various conditions.

Main Methods:

• Enzymatic synthesis of alpha-glucans from sucrose.
• High-pressure homogenization to create nanoparticles (~120 nm).
• Fluorescence measurements using DPH to assess hydrophobic core integrity.
• Stability testing at different pH levels and accelerated temperature exposure.

Main Results:

• Alpha-glucan nanoparticles (~120 nm, surface potential ~-3 mV) were successfully produced.
• The nanoparticles possess a stable hydrophobic core, intact from 10 to 85 °C.
• Demonstrated stability for over 220 days across three pH levels.
• Endured exposure to 60 °C for 6-hour intervals without degradation.

Conclusions:

• Alpha-glucan nanoparticles exhibit excellent stability and a robust hydrophobic core.
• These nanoparticles are suitable for applications requiring thermal and pH resilience.
• The study highlights the potential of enzymatically synthesized alpha-glucans for advanced material applications.