When oil is reused for frying, one kind of breakdown product (erythro-dihydroxy) builds up more than another (threo-dihydroxy), because it comes from a different type of fat that forms more during heating.
Scientific Claim
During deep-frying of potato chips in high-oleic sunflower oil, concentrations of erythro-dihydroxy fatty acids increase more than threo-dihydroxy fatty acids, reflecting preferential hydrolysis of trans-epoxy fatty acids.
Original Statement
“concentrations of erythro-dihydroxy-FA, derived from trans-epoxy-FA, increase during frying stronger than threo-dihydroxy-FA derived from cis-epoxy-FA”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design cannot support claim
Appropriate Language Strength
definitive
Can make definitive causal claims
Assessment Explanation
The claim reflects exact wording from the abstract describing relative increases in specific isomers. No causal or predictive claims are made. Based on abstract only - full methodology not available to verify
Evidence from Studies
Supporting (1)
<i>Trans</i>-Hydroxy, <i>Trans</i>-Epoxy, and <i>Erythro</i>-dihydroxy Fatty Acids Increase during Deep-Frying
When frying potato chips in this special oil, the bad fats that form (trans-epoxy) turn into a specific type of dihydroxy fat (erythro) more than others, and the study proves this happens more than the other kind.