Influence of Polydimethylsiloxane on the Degradation of Soybean Oil at Frying Temperature

Soybean oils treated with 5, 10, 25, 50, and 100 ppb polydimethylsiloxane (PDMS) and a control soybean oil (no PDMS) were heated at 180 °C for 48 h. The decomposition of linoleate (18:2) and tocopherols was monitored. The degradation of 18:2 and both γ- and δ-tocopherols followed pseudo first-order...

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Bibliographic Details
Published in:Journal of the American Oil Chemists' Society 2011-10, Vol.88 (10), p.1573-1579
Main Authors: Gerde, Jose A, Hammond, Earl G, White, Pamela J
Format: Article
Language:English
Subjects:
Agriculture
Biological and medical sciences
Biomaterials
Biotechnology
Chemistry
Chemistry and Materials Science
Cooking
Degradation
Fat industries
Food industries
Food Science
Frying
Fundamental and applied biological sciences. Psychology
Industrial Chemistry/Chemical Engineering
Kinetics
Original Paper
Polydimethylsiloxane
Soybean oil
Soybeans
temperature
Tocopherol
tocopherols
Vegetable oils
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Summary:Soybean oils treated with 5, 10, 25, 50, and 100 ppb polydimethylsiloxane (PDMS) and a control soybean oil (no PDMS) were heated at 180 °C for 48 h. The decomposition of linoleate (18:2) and tocopherols was monitored. The degradation of 18:2 and both γ- and δ-tocopherols followed pseudo first-order kinetics. For 25 ppb PDMS (the concentration necessary to form a PDMS monolayer on the air-oil interface) and greater concentrations, 18:2 degradation decreased at a rate comparable to the control. However, for the samples with 25 ppb or more PDMS, there was a subsequent increase in the rate of 18:2 degradation during the 48 h of heating period. The same trend seen for 18:2 degradation also was observed for the rates of degradation of both γ- and δ-tocopherols; but, for the tocopherols the treatment with 10 ppb PDMS also decreased the rate of degradation. For those PDMS treatments in which a subsequent increase in degradation rates were observed, the rates of degradation after the change were similar to the rate of degradation in the control oil. In general, the time that the changes in rates occurred increased with the PDMS concentrations. The occurrence of these changes was attributed to decreases in the concentrations of tocopherols or PDMS such that the protective effects were lost.
ISSN:0003-021X
1558-9331
DOI:10.1007/s11746-011-1810-3