[Blood titanium levels before and after oral administration titanium dioxide]

Area of Science:

• Environmental Science
• Toxicology
• Materials Science

Background:

• Titanium dioxide (TiO2) is a widely used substance in various industries.
• Understanding its absorption and fate in the human body is crucial for safety assessments.
• Normal blood titanium levels in adult males provide a baseline for absorption studies.

Purpose of the Study:

• To investigate the absorption of orally administered titanium dioxide from the gastrointestinal tract.
• To determine the influence of particle size on titanium dioxide absorption.
• To characterize the blood concentration-time profile following oral TiO2 intake.

Main Methods:

• Oral administration of titanium dioxide (anatase form) in capsules or powder.
• Analysis of blood titanium levels using Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES).
• Comparison of absorption for different TiO2 particle sizes (0.16 micron vs. 0.38 micron).

Main Results:

• Titanium dioxide is absorbed from the gastrointestinal tract after oral administration.
• Smaller TiO2 particles (0.16 micron) showed higher absorption compared to larger particles (0.38 micron), likely due to agglomeration.
• Blood concentration-time curves indicated a persorption mechanism with significant individual variability.
• Doubling the administered dose resulted in only a slight, non-significant increase in blood titanium levels.

Conclusions:

• Oral intake of titanium dioxide leads to its absorption into the bloodstream.
• Particle size is a critical factor affecting TiO2 bioavailability, with smaller particles being more readily absorbed.
• The absorption process is characterized by persorption and exhibits high inter-individual fluctuations.