Abstract
Polyglycerol-polyricinoleate (PGPR) and curcumin were added to canola oil in order to evaluate the effects of PGPR on the interfacial performance of curcumin. A combination-model (linear-sigmoidal) was employed for measuring kinetic-indices relevant to the initiation and propagation phases during the peroxidation process. In the presence of curcumin (4.343 mM), the rate constants of formation and decomposition of hydroperoxides (ROOHs) were 2.94 × 10−5 meq.kg and 6.1 × 10−3 min−1, respectively, which significantly decreased compared to the control sample. The antioxidant activity of curcumin (1.086 mM) was 2.07, which increased in the presence of PGPR (2.72). This enhancement was due to a decrease in the participation rate of curcumin molecule (AH) in an undesirable chain-initiation reaction, i.e. AH + ROOH→A●+RO●+H2O. In addition, an analysis of rate equations showed that the electron-transfer mechanism of curcumin was modified in the presence of PGPR, so that the rate of participation was reduced to zero in the undesirable reaction, i.e. A●+RH→AH + R●.
Published Version
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