Long-term stability of PBCA nanoparticle suspensions.

Area of Science:

• Polymer Science
• Nanotechnology
• Materials Science

Background:

• Poly(butyl cyanoacrylate) (PBCA) nanoparticles are utilized in various biomedical applications.
• Ensuring the long-term stability of PBCA nanoparticle suspensions is crucial for their clinical translation.
• Current storage methods like lyophilization can be complex and require resuspension.

Purpose of the Study:

• To evaluate the stability of PBCA nanoparticle suspensions over a one-year period.
• To investigate the impact of different stabilizers and storage conditions on PBCA nanoparticle size.
• To determine optimal storage conditions for PBCA nanoparticles, avoiding complex processing.

Main Methods:

• PBCA nanoparticles were formulated using dextran 70,000, poloxamer 188, or polysorbate 85 as stabilizers.
• Particle size was measured before and after purification (centrifugation) and dilution (0.1 N HCl, 0.01 N HCl, H2O, PBS).
• Nanoparticle size was monitored over one year to assess stability and detect degradation or agglomeration.

Main Results:

• PBCA nanoparticle suspensions exhibited the most consistent sizes when stored untreated in acidic conditions (0.1 N HCl, 0.01 N HCl).
• Agglomeration occurred in other conditions (polysorbate 85, poloxamer 188, dextran, PBS, H2O), with the extent and timing dependent on the specific experimental setup.
• No evidence of polymer degradation (size decrease) was observed in any of the tested conditions over the one-year study period.

Conclusions:

• PBCA nanoparticles can be effectively stored as stable suspensions, particularly under acidic conditions.
• The observed stability eliminates the need for lyophilization and subsequent resuspension, simplifying handling.
• This storage method offers significant advantages for the clinical application of PBCA nanoparticles.