Yuan et al. 2012 — Aluminum Overload and Oxidative Stress in Neonatal Rat Brains
This 2012 Taiwanese animal study demonstrated dose-dependent aluminum accumulation and oxidative stress (measured as TBARS/lipid peroxidation) in multiple brain regions of neonatal rats. This is an animal toxicology study; it provides mechanistic support for Al neurotoxicity in early development but does not provide food or formula concentration data.
Key numbers
Brain Al concentrations after intraperitoneal AlCl3 (ng/g wet weight):
| Region | Control | High Al (35 mg/kg/day) | p |
|---|---|---|---|
| Hippocampus | 294.9 ± 180.8 | 751.0 ± 225.8 | <0.05 |
| Diencephalon | 20.4 ± 9.6 | 79.6 ± 20.7 | <0.05 |
| Cerebellum | 83.1 ± 15.2 | 144.8 ± 36.2 | <0.05 |
| Whole brain | — | 219.5 ± 43.1 | — |
TBARS (lipid peroxidation) increased significantly in hippocampus, diencephalon, cerebellum, and brain stem in the high-Al group.
Methods
Intraperitoneal AlCl3 injection PND3–17. AAS or ICP (not specified). Wet weight. Animal study; intraperitoneal route does not replicate oral dietary exposure. Dose of 35 mg Al/kg/day far exceeds human dietary exposure from formula (typically <7 mg/L Al in formula × consumption). Results support the mechanistic plausibility of Al neurotoxicity but cannot directly inform food safety thresholds.
Implications
Health: Provides mechanistic evidence for Al-induced oxidative stress and neural regional vulnerability in early development; supports precautionary concern about high Al in infant formula.
Certification: Cannot be used directly for HMT&C Al thresholds (animal, intraperitoneal route). Relevant to the biological plausibility section of Al toxicology pages.