Hepatotoxicity of titanium dioxide nanoparticles.

Area of Science:

• Food Science
• Toxicology
• Nanotechnology

Background:

• Titanium dioxide (TiO2), also known as E171, is a common food additive.
• A significant portion of TiO2 particles are in the nanoparticulate range (<100 nm).
• Concerns exist regarding the safety and risk assessment of TiO2 nanoparticles (TiO2 NPs).

Purpose of the Study:

• To review the adverse effects of orally administered TiO2 NPs on the liver.
• To discuss the current controversies surrounding TiO2 toxicity.

Main Methods:

• Literature review of in vitro and in vivo studies.
• Analysis of studies focusing on oral administration and liver toxicity.
• Examination of factors influencing TiO2 NP toxicity, including particle characteristics and dosage.

Main Results:

• TiO2 NPs have demonstrated dose-dependent toxicity in the liver.
• Observed effects include inflammation, cell death, and structural/functional liver changes.
• Toxicity varies based on NP characteristics, dosage, and administration route, with ingestion being a key exposure route.

Conclusions:

• Oral exposure to TiO2 NPs poses risks to liver health.
• The current risk assessment for E171 is insufficient.
• Further investigation into the hepatotoxicity of TiO2 NPs is warranted.