Retraction to: J Am Oil Chem Soc (2012) 89:497–504 DOI 10.1007/s11746-011-1924-7

This article has been retracted at the request of the Editor-in-Chief because substantial parts were simultaneously submitted to and published in Renewable Energy (2012) 38:10–15. DOI 10.1016/j.renene.2011.06.010.

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