Effects of adsorption on polycyclic aromatic hydrocarbon, lipid characteristic, oxidative stability and free radical scavenging capacity of sesame oil

Abstract

Treatment with three adsorbents led to reductions of PAHs in sesame oils, and activated carbons (removal rates were 67.4% and 54.7% for Notit-8015 and WY activated charcoal, respectively) were more effective for removal of PAHs than activated clay (removal rate was 20.8%) under the experimental conditions. Fatty acid, triacylglycerol and γ-tocopherol profiles of sesame oils were not significantly influenced by addition of any adsorbents. However, significant differences (P<0.05) were observed in the contents of other minor components (phytosterols, lignans and polyphenols), oxidation stability and free radical scavenging capacity between the crude and treated sesame oils. Polyphenol and phytosterol were good predictors of oxidative stability and antioxidant capacity of sesame oils, due to significant correlations were observed (P<0.05, r = 0.941-1.000). Although adsorption process may bring disadvantage to sesame oils such as reductions of beneficial constituents related to storage stability, free radical scavenging capacity and other physiological functions, however, to eliminate the contamination of PAHs, treatment with activated carbon during sesame oil purification is highly recommended in order to reduce the risk of consumption and to assure the consumer health. Moreover, these results provided a useful guidance for sesame oil plant to improve the quality of the final oil product.

Practical applications: Results of this study provided necessary information about the influence of adsorption process on safety and quality of sesame oils. Data demonstrated that adsorption was a double-edged sword to sesame oils, and treatment with activated carbon during sesame oil purification was highly recommended. Results of this study can be applied to sesame oil plants and are transferable to other flavor edible oils for which lower the risk of consumption and bring economic and social advantages to manufacturers to guarantee the oil quality and consumer health.

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