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Bondioli P.,Stazioni Sperimentali Per iIndustria | Bondioli P.,Head of Technology Unit | Rovellini P.,Stazioni Sperimentali Per iIndustria | Delia Bella L.,Stazioni Sperimentali Per iIndustria | Rjvolta G.,Stazioni Sperimentali Per iIndustria
Rivista Italiana delle Sostanze Grasse | Year: 2012

Five kg of Jatropha curcas whole seed were crushed using a screw press. The extraction yield was higher than 85% of the total crude oil. After an evaluation of the total deoxyhydroxy-phorbol esters content the oil was degummed and bleached with activated silica. After each treatment the deoxy-hydroxy-phorbol esters content decreased from an initial content of 2.32% down to 2.16% and 1.69% respectively. The purified oil was physically neutralised in different temperature/time conditions, while residual pressure was maintained at 1 mbar. Several samples were taken during the experiments and it was possible to demonstrate that at temperatures higher than 23O 0C it is possible to contemporarily remove both fatty acids and deoxy-hydroxy-phorbol esters from oil. A single HPLC method suitable for the evaluation of all classes of obtained products during biodiesel production was developed. Some hypotheses about the fate and transformation of the deoxyhydroxy-phorbol esters are discussed and their degradation products evidenced. Finally four differently purified J. curcas oil samples were transformed into biodiesel. The results of deoxy-hydroxy-phorbol esters contents for both biodiesel and glycerol are reported.

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