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2-Ethylhexanoic acid: subchronic oral toxicity studies in the rat and mouse.

Groups of 10 male and 10 female Fischer 344 rats and B6C3F1 mice were fed diets containing either 0.0, 0.1, 0.5 or 1.5% 2-ethylhexanoic acid (EHA) for 13 wk. Additional groups of 10 male and 10 female rats or mice. were fed either 0.0 or 1.5% EHA for 13 wk followed by a 4-wk recovery (non-treatment) period. Based on food consumption and body weight, the EHA diets provided doses of 61, 303 or 917 mg/kg/day for male rats and 71, 360 or 1068 mg/kg/day for female rats. The EHA diets provided doses of 180, 885 or 2728 mg/kg/day for male mice and 205, 1038 or 3139 mg/kg/day for female mice. No mortality or significant clinical signs of toxicity were observed during the study. Body weights and food consumption of both rats and mice fed 1.5% EHA were lower beginning after the first week of treatment, consistent with a reduction in food consumption. Other groups were unaffected by treatment. After 13 wk, lower triglyceride levels occurred in male mice fed 1.5% EHA and female mice fed 0.5 or 1.5% EHA, but not in other groups. Cholesterol levels were higher in all male rat test groups and in female rats and male and female mice fed either 0.5 or 1.5% EHA, although this effect was reversible following a 28-day recovery period. The principal effects of EHA involved the liver or metabolic processes associated with the liver. The 0.5 and 1.5% diets in both rats and mice were associated with increased relative liver weight and histological changes in hepatocytes, specifically hepatocyte hypertrophy and reduced cytoplasmic vacuolization. Observed histopathological and clinical pathological changes were reversible following recovery. These results indicate that EHA does not produce persistent. overt toxicity in rats or mice following subchronic dietary exposure at concentrations up to 1.5% in feed. The no-observed-adverse-effect level (NOAEL) for male rats was 61 mg/kg/day and the no-observed-effect level (NOEL) for female rats was 71 mg/kg/day, while 180 and 205 mg/kg/day represent NOELs for male and female mice, respectively.[1]

References

  1. 2-Ethylhexanoic acid: subchronic oral toxicity studies in the rat and mouse. Juberg, D.R., David, R.M., Katz, G.V., Bernard, L.G., Gordon, D.R., Vlaovic, M.S., Topping, D.C. Food Chem. Toxicol. (1998) [Pubmed]
 
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