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Biodegradation and toxicity of vegetable oils in contaminated aquatic environments: Effect of antioxidants and oil composition

Show simple item record Salam, Darine.A Suidan, M.T Venosa, a 2022-10-14T12:13:56Z 2022-10-14T12:13:56Z 2016
dc.identifier.citation The degradation and toxicity of commercially traded vegetable oils following spills in aquatic environment Tamothran A.M., Bhubalan K., Anuar S.T. and Curtis J.M. Environmental Research • November 2022
dc.description.abstract Antioxidants may affect the oxidative rate of vegetable oils determining their fate and impact in contaminated aquatic media. In previous studies, we demonstrated the effectiveness of butylated hydroxytoluene (BHT), one of the most used antioxidants in edible oils, in enhancing the biodegradation of glyceryl trilinoleate, a pure triacylglycerol of cis,cis-9,12-octadecadienoic acid (C18:2 delta), through retarding its oxidative polymerization relatively to the oil with no added antioxidant. In this study, the effect of BHT on the biodegradation and toxicity of purified canola oil, a mixed-acid triacylglycerol with high C18:1 content, was investigated in respirometric microcosms and by use of the Microtox® assay. Investigations were carried out in the absence and presence (200mgkg-1) of the antioxidant, and at an oil loading of 0.31Lm-2 (333galacre-1). Substantial oil mineralization was achieved after 16weeks of incubation (>77%) and was not significantly different (p>0.05) between the two BHT treatments, demonstrating an important role of the oil fatty acid composition in determining the potency of antioxidants and, consequently, the fate of spilled vegetable oils. Furthermore, for both treatments, toxicity was measured at early stages of the experiments and disappeared at a later stage of incubation. The observed transient toxicity was associated with the combined effect of toxic biodegradation intermediates and autoxidation products. These results were supported by the gradual disappearance of BHT in the microcosms initially supplemented with the antioxidant, reaching negligible amounts after only 2weeks of incubation. © 2016 Elsevier B.V.
dc.language.iso en
dc.subject Aquatic pollution
dc.subject Vegetable oil spills
dc.subject Toxic biodegradation intermediates;
dc.subject Bioremediation; Oil polymerization;
dc.subject Autoxidation products
dc.title Biodegradation and toxicity of vegetable oils in contaminated aquatic environments: Effect of antioxidants and oil composition
dc.type Article

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