Meaning
An evaluation of the fraction of a substance that dissolves in gastrointestinal fluids determines the potential for systemic absorption. Every bioaccessibility assessment focuses on the amount of a compound that is released from the polymer matrix during digestion. This value represents the maximum amount available for uptake by the human body.
Researchers use this data to refine safety margins for plastic additives and pigments.
Digestion Simulation
Laboratory models replicate the conditions of the mouth and stomach. Because a bioaccessibility assessment uses synthetic juices, it avoids the ethical issues of human trials.
Solubility Measurement
Chemical analysis quantifies the concentration of migrants in the fluid after a set incubation period. In a bioaccessibility assessment, centrifugation separates the undissolved plastic particles from the liquid phase. This liquid is then tested using mass spectrometry to identify specific molecules.
The results show whether a substance remains trapped in the polymer or enters the solution. Testing at different pH levels reveals how the compound behaves as it moves through the digestive tract.
Safety Conclusion
High release rates suggest that an additive may pose a higher risk than previously thought. Findings from a bioaccessibility assessment inform the development of more stable resin formulations. Securely bound additives reduce the likelihood of exposure for the end user.
