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Efficacy of gossypol as an antioxidant additive in biodiesel

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  • Moser, Bryan R.

Abstract

The efficacy of gossypol as an antioxidant additive in fatty acid methyl esters (FAMEs) prepared from soybean oil (SME), waste cooking oil (WCME) and technical grade methyl oleate (MO) was investigated. Gossypol is a naturally occurring polyphenolic aldehyde with antioxidant properties isolated from cottonseed that is toxic to humans and animals. At treatment levels of 250 and 500 ppm, gossypol exhibited statistically significant improvements in the induction periods (IPs; EN 14112) of SME, WCME and MO. Efficacy was most pronounced in SME, which was due to its higher concentration of endogenous tocopherols (757 ppm) versus WCME (60 ppm) and MO (0 ppm). A comparison of antioxidant efficacy was made with butylated hydroxytoluene (BHT) and γ-tocopherol. For FAMEs with low concentrations of endogenous tocopherols (WCME and MO), γ-tocopherol exhibited the greatest efficacy, although treatments employing BHT and gossypol also yielded statistically significant improvements to oxidative stability. In summary, gossypol was effective as an exogenous antioxidant for FAMEs investigated herein. In particular, FAMEs containing a comparatively high percentage of endogenous tocopherols were especially suited to gossypol as an antioxidant additive.

Suggested Citation

  • Moser, Bryan R., 2012. "Efficacy of gossypol as an antioxidant additive in biodiesel," Renewable Energy, Elsevier, vol. 40(1), pages 65-70.
    • Handle: RePEc:eee:renene:v:40:y:2012:i:1:p:65-70
    DOI: 10.1016/j.renene.2011.09.022
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    References listed on IDEAS

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    1. Moser, Bryan R., 2011. "Influence of extended storage on fuel properties of methyl esters prepared from canola, palm, soybean and sunflower oils," Renewable Energy, Elsevier, vol. 36(4), pages 1221-1226.
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    1. Diana da Silva Araújo, Francisca & Araújo, Iranildo C. & Costa, Isabella Cristhina G. & Rodarte de Moura, Carla Verônica & Chaves, Mariana H. & Araújo, Eugênio Celso E., 2014. "Study of degumming process and evaluation of oxidative stability of methyl and ethyl biodiesel of Jatropha curcas L. oil from three different Brazilian states," Renewable Energy, Elsevier, vol. 71(C), pages 495-501.
    2. Moser, Bryan R. & Dien, Bruce S. & Seliskar, Denise M. & Gallagher, John L., 2013. "Seashore mallow (Kosteletzkya pentacarpos) as a salt-tolerant feedstock for production of biodiesel and ethanol," Renewable Energy, Elsevier, vol. 50(C), pages 833-839.

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