Grasas y Aceites, Vol 56, No 4 (2005)

Effectiveness of added natural antioxidants in sunflower oil


https://doi.org/10.3989/gya.2005.v56.i4.97

Amalia A. Carelli
PLAPIQUI (UNS-CONICET), Argentina

Indira C. Franco
PLAPIQUI (UNS-CONICET), Argentina

Guillermo H. Crapiste
PLAPIQUI (UNS-CONICET), Argentina

Abstract


The antioxidant activity of α- and δ-tocopherol, citric acid, ascorbic acid and ascorbyl palmitate was investigated in sunflower oil containing naturally occurring tocopherol. The effectiveness of natural antioxidants in sunflower oil was monitored by the accelerated oxidative stability test Rancimat and oxidation development during storage under different conditions. Samples in storage experiments were periodically removed and analyzed for peroxide value, p-anisidine value, total content and distribution of polar compounds, and residual naturally occurring tocopherol. The effectiveness of each antioxidant was strongly dependent on temperature and the testing method. While ascorbic acid appears to be the most effective antioxidant according to the Rancimat oxidative stability index, δ-tocopherol shows improved performance when considering storage experiments.

Keywords


Autooxidation; Natural antioxidants; Polar compounds; Sunflower oil

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