Antioxidants 2014, 3(1), 176-188; doi:10.3390/antiox3010176

Effectiveness of α-, γ- and δ-Tocopherol in a CLA-Rich Oil

1,* email, 1email, 1email and 2email
Received: 31 December 2013; in revised form: 12 February 2014 / Accepted: 25 February 2014 / Published: 17 March 2014
(This article belongs to the Special Issue Antioxidants in Oils)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Conjugated linoleic acid (CLA) is a mixture of positional and geometric isomers of octadecadienoic acid with conjugated double bounds. Positive health properties have been attributed to some isomers, such as anticarcinogenic activity, antiartherosclerotic effects and reduction of body fat gain. Hence, oils rich in CLA such as Tonalin® oil (TO), normally obtained through alkaline isomerization of safflower oil (SO), an oil rich in linoleic acid (LA), are currently used in functional foods. However, special care must be taken to protect them from oxidation to ensure the quality of the supplemented foods. The objective of this work was to evaluate the oxidation and effectiveness of different tocopherol homologues (α-, γ- and δ-), alone or in combination with synergists (ascorbyl palmitate and lecithin), in TO compared to SO at different conditions, ambient temperature (25 °C) and accelerated conditions in Rancimat (100 °C). The oils, the oils devoid of their antioxidants and the latter containing the antioxidants added were assayed. Results showed great differences between SO and TO in terms of formation of hydroperoxides and polymers and also in the effectiveness of tocopherols to delay oxidation. TO showed higher levels of polymerization and, in general, the effectiveness of tocopherol homologues, alone or in combination with synergists, was also lower in the TO.
Keywords: antioxidants; CLA; conjugated linoleic acid; functional lipids; lipid oxidation; peroxide value; polymers; tocopherols
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MDPI and ACS Style

Márquez-Ruiz, G.; García-Martínez, M.C.; Holgado, F.; Velasco, J. Effectiveness of α-, γ- and δ-Tocopherol in a CLA-Rich Oil. Antioxidants 2014, 3, 176-188.

AMA Style

Márquez-Ruiz G, García-Martínez MC, Holgado F, Velasco J. Effectiveness of α-, γ- and δ-Tocopherol in a CLA-Rich Oil. Antioxidants. 2014; 3(1):176-188.

Chicago/Turabian Style

Márquez-Ruiz, Gloria; García-Martínez, María C.; Holgado, Francisca; Velasco, Joaquín. 2014. "Effectiveness of α-, γ- and δ-Tocopherol in a CLA-Rich Oil." Antioxidants 3, no. 1: 176-188.

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