Loss of tocopherols and formation of degradation compounds in triacylglycerol model systems heated at high temperature
✍ Scribed by Barrera-Arellano, Daniel; Ruiz-M�ndez, Victoria; M�rquez Ruiz, Gloria; Dobarganes, Carmen
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 91 KB
- Volume
- 79
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
Triolein, trilinolein and a mixture of both (1:1) were heated at 180 °C for 2, 4, 6, 8 and 10 h in the absence of tocopherols or in the presence of a-tocopherol (500 mg kg À1 ), d-tocopherol (500 mg kg À1 ) or a mixture of a-, b-, g-and d-tocopherol (200±250 mg kg À1 each). Losses of tocopherols as well as increases in polymeric triacylglycerols were followed. Total polar compounds were also evaluated after 10 h heating. Results demonstrated that the antipolymerisation effect of tocopherols at high temperature depended on the degree of unsaturation affecting to a greater extent the less unsaturated substrate, triolein. The maximum effect for the three substrates was found when the tocopherol mixture was added. Interestingly, a-tocopherol losses were very rapid and independent of the unsaturation of the triacylglycerol system under the conditions used, although degradation of the substrate was signi®cantly higher as the degree of unsaturation increased for any period of heating.