Investigating the ROS Formation and Particle Behavior of Food-Grade Titanium Dioxide (E171) in the TIM-1 Dynamic...

Area of Science:

• Food science
• Nanotechnology
• Toxicology

Background:

• Food-grade titanium dioxide (E171) is a common food additive.
• Its potential to form reactive oxygen species (ROS) requires investigation.
• Understanding E171 behavior in simulated gastrointestinal conditions is crucial.

Purpose of the Study:

• To investigate E171's ROS formation and aggregation in simulated gastrointestinal conditions.
• To assess the influence of food matrices and digestion on E171 properties.

Main Methods:

• Utilized the TNO Gastrointestinal (GI) model for digestion simulation.
• Employed electron spin resonance, ICP-MS, TEM, and DLS for characterization.
• Analyzed E171 in aqueous dispersion and yogurt matrix.

Main Results:

• E171 in aqueous dispersion showed significant ROS production and a high nanoparticle fraction.
• Yogurt matrix inhibited ROS production and increased particle size, reducing nanoparticles.
• GI digestion led to particle aggregation and reduced nanoparticle fractions in both conditions, inhibiting ROS.

Conclusions:

• E171 has an inherent potential to induce ROS.
• Food matrices and GI digestion significantly alter E171's physical state and ROS-inducing potential.
• Consideration of these factors is essential for accurate hazard and risk assessment of E171.