Dissolution test for risk assessment of nanoparticles: a pilot study

Area of Science:

• Nanotechnology
• Toxicology
• Environmental Science

Background:

• Effective risk assessment models for orally ingested nanoparticles are crucial.
• In vitro dissolution tests can quantify nanoparticle properties linked to bioaccessibility and bioavailability.
• Standardized testing is needed to address the complexity of nanoparticle behavior in biological systems.

Purpose of the Study:

• To apply an in vitro dissolution test to quantify silver nanoparticle dissolution under dynamic human digestion conditions.
• To describe bioaccessible ionic silver species throughout different digestion phases.
• To correlate in vitro dissolution data with in vivo absorption and excretion parameters.

Main Methods:

• Utilized an in vitro dissolution test under dynamic conditions simulating human digestion.
• Employed a multi-technique approach to validate test feasibility and data.
• Followed pre-standardized operational procedures for reliable, reproducible results.

Main Results:

• Quantified the dissolution of silver nanoparticles and identified bioaccessible ionic species.
• Demonstrated the test's ability to mimic real-world digestion conditions.
• Established a correlation between in vitro estimated bioaccessible ions and in vivo absorption/excretion data.

Conclusions:

• The in vitro dissolution test is feasible for assessing orally ingested nanoparticles.
• The test provides reliable data for risk assessment and regulatory "read-across" principles.
• This method supports the regulatory evaluation of nanoparticle safety.