Genotoxicity and subchronic toxicity studies with heated olestra

Area of Science:

• Food Science and Technology
• Toxicology
• Biochemistry

Background:

• Olestra is a sucrose-fatty acid polyester designed as a non-caloric edible oil replacement.
• Concerns exist regarding potential genotoxic or toxic breakdown products during commercial use, particularly deep-frying.

Purpose of the Study:

• To evaluate the genotoxicity and subchronic toxicity of olestra after simulated commercial deep-frying.
• To determine if heated olestra poses a hazard at anticipated human consumption levels.

Main Methods:

• Heated olestra was prepared by batch-frying potato slices at 177-185°C for 25-32 hours.
• Genotoxicity was assessed using in vitro assays (Ames test, mouse lymphoma, unscheduled DNA synthesis, clastogenicity) and in vivo assays (rat bone marrow chromosomal aberrations).
• Subchronic toxicity involved feeding rats heated olestra at up to 10% of their diet for 91 days, with comprehensive physiological and histomorphological evaluations.

Main Results:

• Heated olestra demonstrated no genotoxic activity in standard in vitro and in vivo assays.
• No adverse effects were observed in rats fed heated olestra at levels exceeding anticipated human consumption, across various health parameters.
• Survival, food consumption, body weight, organ weights, hematology, clinical chemistry, and histomorphology remained unaffected.

Conclusions:

• Olestra used as a deep-frying medium does not form genotoxic or toxic breakdown products under simulated commercial conditions.
• The study concludes that olestra poses no genotoxic or toxic hazard at anticipated levels of human consumption.