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

The Science of the Total Environment
Darine A SalamAlbert D Venosa

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 (200 mg kg(-1)) of the antioxidant, and at an oil loading of 0.31 L m(-2) (333 gal acre(-1)). Substantial oil mineralization was achieved after 16 weeks 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 meas...Continue Reading

References

Dec 1, 1975·Journal of General Microbiology·J P Fay, R N Farias
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Jul 31, 2002·Marine Pollution Bulletin·M Glória PereiraJohn Latchford
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Aug 23, 2003·Marine Pollution Bulletin·M Glória PereiraJohn Latchford
Jun 12, 2012·Environmental Science & Technology·Darine A SalamAlbert D Venosa

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Citations

Dec 1, 2017·Environmental Science and Pollution Research International·Ifeoluwa A Bamgbose, Todd A Anderson

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